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Posted to common-commits@hadoop.apache.org by wh...@apache.org on 2016/01/05 20:52:45 UTC
[45/50] [abbrv] hadoop git commit: [partial-ns] Import snappy in
hdfsdb.
http://git-wip-us.apache.org/repos/asf/hadoop/blob/cb5ba73b/hadoop-hdfs-project/hadoop-hdfsdb/src/main/native/snappy/ChangeLog
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+------------------------------------------------------------------------
+r83 | snappy.mirrorbot@gmail.com | 2014-02-19 11:31:49 +0100 (Wed, 19 Feb 2014) | 9 lines
+
+Fix public issue 82: Stop distributing benchmark data files that have
+unclear or unsuitable licensing.
+
+In general, we replace the files we can with liberally licensed data,
+and remove all the others (in particular all the parts of the Canterbury
+corpus that are not clearly in the public domain). The replacements
+do not always have the exact same characteristics as the original ones,
+but they are more than good enough to be useful for benchmarking.
+
+------------------------------------------------------------------------
+r82 | snappy.mirrorbot@gmail.com | 2013-10-25 15:31:27 +0200 (Fri, 25 Oct 2013) | 8 lines
+
+Add support for padding in the Snappy framed format.
+
+This is specifically motivated by DICOM's demands that embedded data
+must be of an even number of bytes, but could in principle be used for
+any sort of padding/alignment needed.
+
+R=sanjay
+
+------------------------------------------------------------------------
+r81 | snappy.mirrorbot@gmail.com | 2013-10-15 17:21:31 +0200 (Tue, 15 Oct 2013) | 4 lines
+
+Release Snappy 1.1.1.
+
+R=jeff
+
+------------------------------------------------------------------------
+r80 | snappy.mirrorbot@gmail.com | 2013-08-13 14:55:00 +0200 (Tue, 13 Aug 2013) | 6 lines
+
+Add autoconf tests for size_t and ssize_t. Sort-of resolves public issue 79;
+it would solve the problem if MSVC typically used autoconf. However, it gives
+a natural place (config.h) to put the typedef even for MSVC.
+
+R=jsbell
+
+------------------------------------------------------------------------
+r79 | snappy.mirrorbot@gmail.com | 2013-07-29 13:06:44 +0200 (Mon, 29 Jul 2013) | 14 lines
+
+When we compare the number of bytes produced with the offset for a
+backreference, make the signedness of the bytes produced clear,
+by sticking it into a size_t. This avoids a signed/unsigned compare
+warning from MSVC (public issue 71), and also is slightly clearer.
+
+Since the line is now so long the explanatory comment about the -1u
+trick has to go somewhere else anyway, I used the opportunity to
+explain it in slightly more detail.
+
+This is a purely stylistic change; the emitted assembler from GCC
+is identical.
+
+R=jeff
+
+------------------------------------------------------------------------
+r78 | snappy.mirrorbot@gmail.com | 2013-06-30 21:24:03 +0200 (Sun, 30 Jun 2013) | 111 lines
+
+In the fast path for decompressing literals, instead of checking
+whether there's 16 bytes free and then checking right afterwards
+(when having subtracted the literal size) that there are now
+5 bytes free, just check once for 21 bytes. This skips a compare
+and a branch; although it is easily predictable, it is still
+a few cycles on a fast path that we would like to get rid of.
+
+Benchmarking this yields very confusing results. On open-source
+GCC 4.8.1 on Haswell, we get exactly the expected results; the
+benchmarks where we hit the fast path for literals (in particular
+the two HTML benchmarks and the protobuf benchmark) give very nice
+speedups, and the others are not really affected.
+
+However, benchmarks with Google's GCC branch on other hardware
+is much less clear. It seems that we have a weak loss in some cases
+(and the win for the “typical” win cases are not nearly as clear),
+but that it depends on microarchitecture and plain luck in how we run
+the benchmark. Looking at the generated assembler, it seems that
+the removal of the if causes other large-scale changes in how the
+function is laid out, which makes it likely that this is just bad luck.
+
+Thus, we should keep this change, even though its exact current impact is
+unclear; it's a sensible change per se, and dropping it on the basis of
+microoptimization for a given compiler (or even branch of a compiler)
+would seem like a bad strategy in the long run.
+
+Microbenchmark results (all in 64-bit, opt mode):
+
+ Nehalem, Google GCC:
+
+ Benchmark Base (ns) New (ns) Improvement
+ ------------------------------------------------------------------------------
+ BM_UFlat/0 76747 75591 1.3GB/s html +1.5%
+ BM_UFlat/1 765756 757040 886.3MB/s urls +1.2%
+ BM_UFlat/2 10867 10893 10.9GB/s jpg -0.2%
+ BM_UFlat/3 124 131 1.4GB/s jpg_200 -5.3%
+ BM_UFlat/4 31663 31596 2.8GB/s pdf +0.2%
+ BM_UFlat/5 314162 308176 1.2GB/s html4 +1.9%
+ BM_UFlat/6 29668 29746 790.6MB/s cp -0.3%
+ BM_UFlat/7 12958 13386 796.4MB/s c -3.2%
+ BM_UFlat/8 3596 3682 966.0MB/s lsp -2.3%
+ BM_UFlat/9 1019193 1033493 953.3MB/s xls -1.4%
+ BM_UFlat/10 239 247 775.3MB/s xls_200 -3.2%
+ BM_UFlat/11 236411 240271 606.9MB/s txt1 -1.6%
+ BM_UFlat/12 206639 209768 571.2MB/s txt2 -1.5%
+ BM_UFlat/13 627803 635722 641.4MB/s txt3 -1.2%
+ BM_UFlat/14 845932 857816 538.2MB/s txt4 -1.4%
+ BM_UFlat/15 402107 391670 1.2GB/s bin +2.7%
+ BM_UFlat/16 283 279 683.6MB/s bin_200 +1.4%
+ BM_UFlat/17 46070 46815 781.5MB/s sum -1.6%
+ BM_UFlat/18 5053 5163 782.0MB/s man -2.1%
+ BM_UFlat/19 79721 76581 1.4GB/s pb +4.1%
+ BM_UFlat/20 251158 252330 697.5MB/s gaviota -0.5%
+ Sum of all benchmarks 4966150 4980396 -0.3%
+
+
+ Sandy Bridge, Google GCC:
+
+ Benchmark Base (ns) New (ns) Improvement
+ ------------------------------------------------------------------------------
+ BM_UFlat/0 42850 42182 2.3GB/s html +1.6%
+ BM_UFlat/1 525660 515816 1.3GB/s urls +1.9%
+ BM_UFlat/2 7173 7283 16.3GB/s jpg -1.5%
+ BM_UFlat/3 92 91 2.1GB/s jpg_200 +1.1%
+ BM_UFlat/4 15147 14872 5.9GB/s pdf +1.8%
+ BM_UFlat/5 199936 192116 2.0GB/s html4 +4.1%
+ BM_UFlat/6 12796 12443 1.8GB/s cp +2.8%
+ BM_UFlat/7 6588 6400 1.6GB/s c +2.9%
+ BM_UFlat/8 2010 1951 1.8GB/s lsp +3.0%
+ BM_UFlat/9 761124 763049 1.3GB/s xls -0.3%
+ BM_UFlat/10 186 189 1016.1MB/s xls_200 -1.6%
+ BM_UFlat/11 159354 158460 918.6MB/s txt1 +0.6%
+ BM_UFlat/12 139732 139950 856.1MB/s txt2 -0.2%
+ BM_UFlat/13 429917 425027 961.7MB/s txt3 +1.2%
+ BM_UFlat/14 585255 587324 785.8MB/s txt4 -0.4%
+ BM_UFlat/15 276186 266173 1.8GB/s bin +3.8%
+ BM_UFlat/16 205 207 925.5MB/s bin_200 -1.0%
+ BM_UFlat/17 24925 24935 1.4GB/s sum -0.0%
+ BM_UFlat/18 2632 2576 1.5GB/s man +2.2%
+ BM_UFlat/19 40546 39108 2.8GB/s pb +3.7%
+ BM_UFlat/20 175803 168209 1048.9MB/s gaviota +4.5%
+ Sum of all benchmarks 3408117 3368361 +1.2%
+
+
+ Haswell, upstream GCC 4.8.1:
+
+ Benchmark Base (ns) New (ns) Improvement
+ ------------------------------------------------------------------------------
+ BM_UFlat/0 46308 40641 2.3GB/s html +13.9%
+ BM_UFlat/1 513385 514706 1.3GB/s urls -0.3%
+ BM_UFlat/2 6197 6151 19.2GB/s jpg +0.7%
+ BM_UFlat/3 61 61 3.0GB/s jpg_200 +0.0%
+ BM_UFlat/4 13551 13429 6.5GB/s pdf +0.9%
+ BM_UFlat/5 198317 190243 2.0GB/s html4 +4.2%
+ BM_UFlat/6 14768 12560 1.8GB/s cp +17.6%
+ BM_UFlat/7 6453 6447 1.6GB/s c +0.1%
+ BM_UFlat/8 1991 1980 1.8GB/s lsp +0.6%
+ BM_UFlat/9 766947 770424 1.2GB/s xls -0.5%
+ BM_UFlat/10 170 169 1.1GB/s xls_200 +0.6%
+ BM_UFlat/11 164350 163554 888.7MB/s txt1 +0.5%
+ BM_UFlat/12 145444 143830 832.1MB/s txt2 +1.1%
+ BM_UFlat/13 437849 438413 929.2MB/s txt3 -0.1%
+ BM_UFlat/14 603587 605309 759.8MB/s txt4 -0.3%
+ BM_UFlat/15 249799 248067 1.9GB/s bin +0.7%
+ BM_UFlat/16 191 188 1011.4MB/s bin_200 +1.6%
+ BM_UFlat/17 26064 24778 1.4GB/s sum +5.2%
+ BM_UFlat/18 2620 2601 1.5GB/s man +0.7%
+ BM_UFlat/19 44551 37373 3.0GB/s pb +19.2%
+ BM_UFlat/20 165408 164584 1.0GB/s gaviota +0.5%
+ Sum of all benchmarks 3408011 3385508 +0.7%
+
+------------------------------------------------------------------------
+r77 | snappy.mirrorbot@gmail.com | 2013-06-14 23:42:26 +0200 (Fri, 14 Jun 2013) | 92 lines
+
+Make the two IncrementalCopy* functions take in an ssize_t instead of a len,
+in order to avoid having to do 32-to-64-bit signed conversions on a hot path
+during decompression. (Also fixes some MSVC warnings, mentioned in public
+issue 75, but more of those remain.) They cannot be size_t because we expect
+them to go negative and test for that.
+
+This saves a few movzwl instructions, yielding ~2% speedup in decompression.
+
+
+Sandy Bridge:
+
+Benchmark Base (ns) New (ns) Improvement
+-------------------------------------------------------------------------------------------------
+BM_UFlat/0 48009 41283 2.3GB/s html +16.3%
+BM_UFlat/1 531274 513419 1.3GB/s urls +3.5%
+BM_UFlat/2 7378 7062 16.8GB/s jpg +4.5%
+BM_UFlat/3 92 92 2.0GB/s jpg_200 +0.0%
+BM_UFlat/4 15057 14974 5.9GB/s pdf +0.6%
+BM_UFlat/5 204323 193140 2.0GB/s html4 +5.8%
+BM_UFlat/6 13282 12611 1.8GB/s cp +5.3%
+BM_UFlat/7 6511 6504 1.6GB/s c +0.1%
+BM_UFlat/8 2014 2030 1.7GB/s lsp -0.8%
+BM_UFlat/9 775909 768336 1.3GB/s xls +1.0%
+BM_UFlat/10 182 184 1043.2MB/s xls_200 -1.1%
+BM_UFlat/11 167352 161630 901.2MB/s txt1 +3.5%
+BM_UFlat/12 147393 142246 842.8MB/s txt2 +3.6%
+BM_UFlat/13 449960 432853 944.4MB/s txt3 +4.0%
+BM_UFlat/14 620497 594845 775.9MB/s txt4 +4.3%
+BM_UFlat/15 265610 267356 1.8GB/s bin -0.7%
+BM_UFlat/16 206 205 932.7MB/s bin_200 +0.5%
+BM_UFlat/17 25561 24730 1.4GB/s sum +3.4%
+BM_UFlat/18 2620 2644 1.5GB/s man -0.9%
+BM_UFlat/19 45766 38589 2.9GB/s pb +18.6%
+BM_UFlat/20 171107 169832 1039.5MB/s gaviota +0.8%
+Sum of all benchmarks 3500103 3394565 +3.1%
+
+
+Westmere:
+
+Benchmark Base (ns) New (ns) Improvement
+-------------------------------------------------------------------------------------------------
+BM_UFlat/0 72624 71526 1.3GB/s html +1.5%
+BM_UFlat/1 735821 722917 930.8MB/s urls +1.8%
+BM_UFlat/2 10450 10172 11.7GB/s jpg +2.7%
+BM_UFlat/3 117 117 1.6GB/s jpg_200 +0.0%
+BM_UFlat/4 29817 29648 3.0GB/s pdf +0.6%
+BM_UFlat/5 297126 293073 1.3GB/s html4 +1.4%
+BM_UFlat/6 28252 27994 842.0MB/s cp +0.9%
+BM_UFlat/7 12672 12391 862.1MB/s c +2.3%
+BM_UFlat/8 3507 3425 1040.9MB/s lsp +2.4%
+BM_UFlat/9 1004268 969395 1018.0MB/s xls +3.6%
+BM_UFlat/10 233 227 844.8MB/s xls_200 +2.6%
+BM_UFlat/11 230054 224981 647.8MB/s txt1 +2.3%
+BM_UFlat/12 201229 196447 610.5MB/s txt2 +2.4%
+BM_UFlat/13 609547 596761 685.3MB/s txt3 +2.1%
+BM_UFlat/14 824362 804821 573.8MB/s txt4 +2.4%
+BM_UFlat/15 371095 374899 1.3GB/s bin -1.0%
+BM_UFlat/16 267 267 717.8MB/s bin_200 +0.0%
+BM_UFlat/17 44623 43828 835.9MB/s sum +1.8%
+BM_UFlat/18 5077 4815 841.0MB/s man +5.4%
+BM_UFlat/19 74964 73210 1.5GB/s pb +2.4%
+BM_UFlat/20 237987 236745 746.0MB/s gaviota +0.5%
+Sum of all benchmarks 4794092 4697659 +2.1%
+
+
+Istanbul:
+
+Benchmark Base (ns) New (ns) Improvement
+-------------------------------------------------------------------------------------------------
+BM_UFlat/0 98614 96376 1020.4MB/s html +2.3%
+BM_UFlat/1 963740 953241 707.2MB/s urls +1.1%
+BM_UFlat/2 25042 24769 4.8GB/s jpg +1.1%
+BM_UFlat/3 180 180 1065.6MB/s jpg_200 +0.0%
+BM_UFlat/4 45942 45403 1.9GB/s pdf +1.2%
+BM_UFlat/5 400135 390226 1008.2MB/s html4 +2.5%
+BM_UFlat/6 37768 37392 631.9MB/s cp +1.0%
+BM_UFlat/7 18585 18200 588.2MB/s c +2.1%
+BM_UFlat/8 5751 5690 627.7MB/s lsp +1.1%
+BM_UFlat/9 1543154 1542209 641.4MB/s xls +0.1%
+BM_UFlat/10 381 388 494.6MB/s xls_200 -1.8%
+BM_UFlat/11 339715 331973 440.1MB/s txt1 +2.3%
+BM_UFlat/12 294807 289418 415.4MB/s txt2 +1.9%
+BM_UFlat/13 906160 884094 463.3MB/s txt3 +2.5%
+BM_UFlat/14 1224221 1198435 386.1MB/s txt4 +2.2%
+BM_UFlat/15 516277 502923 979.5MB/s bin +2.7%
+BM_UFlat/16 405 402 477.2MB/s bin_200 +0.7%
+BM_UFlat/17 61640 60621 605.6MB/s sum +1.7%
+BM_UFlat/18 7326 7383 549.5MB/s man -0.8%
+BM_UFlat/19 94720 92653 1.2GB/s pb +2.2%
+BM_UFlat/20 360435 346687 510.6MB/s gaviota +4.0%
+Sum of all benchmarks 6944998 6828663 +1.7%
+
+------------------------------------------------------------------------
+r76 | snappy.mirrorbot@gmail.com | 2013-06-13 18:19:52 +0200 (Thu, 13 Jun 2013) | 9 lines
+
+Add support for uncompressing to iovecs (scatter I/O).
+Windows does not have struct iovec defined anywhere,
+so we define our own version that's equal to what UNIX
+typically has.
+
+The bulk of this patch was contributed by Mohit Aron.
+
+R=jeff
+
+------------------------------------------------------------------------
+r75 | snappy.mirrorbot@gmail.com | 2013-06-12 21:51:15 +0200 (Wed, 12 Jun 2013) | 4 lines
+
+Some code reorganization needed for an internal change.
+
+R=fikes
+
+------------------------------------------------------------------------
+r74 | snappy.mirrorbot@gmail.com | 2013-04-09 17:33:30 +0200 (Tue, 09 Apr 2013) | 4 lines
+
+Supports truncated test data in zippy benchmark.
+
+R=sesse
+
+------------------------------------------------------------------------
+r73 | snappy.mirrorbot@gmail.com | 2013-02-05 15:36:15 +0100 (Tue, 05 Feb 2013) | 4 lines
+
+Release Snappy 1.1.0.
+
+R=sanjay
+
+------------------------------------------------------------------------
+r72 | snappy.mirrorbot@gmail.com | 2013-02-05 15:30:05 +0100 (Tue, 05 Feb 2013) | 9 lines
+
+Make ./snappy_unittest pass without "srcdir" being defined.
+
+Previously, snappy_unittests would read from an absolute path /testdata/..;
+convert it to use a relative path instead.
+
+Patch from Marc-Antonie Ruel.
+
+R=maruel
+
+------------------------------------------------------------------------
+r71 | snappy.mirrorbot@gmail.com | 2013-01-18 13:16:36 +0100 (Fri, 18 Jan 2013) | 287 lines
+
+Increase the Zippy block size from 32 kB to 64 kB, winning ~3% density
+while being effectively performance neutral.
+
+The longer story about density is that we win 3-6% density on the benchmarks
+where this has any effect at all; many of the benchmarks (cp, c, lsp, man)
+are smaller than 32 kB and thus will have no effect. Binary data also seems
+to win little or nothing; of course, the already-compressed data wins nothing.
+The protobuf benchmark wins as much as ~18% depending on architecture,
+but I wouldn't be too sure that this is representative of protobuf data in
+general.
+
+As of performance, we lose a tiny amount since we get more tags (e.g., a long
+literal might be broken up into literal-copy-literal), but we win it back with
+less clearing of the hash table, and more opportunities to skip incompressible
+data (e.g. in the jpg benchmark). Decompression seems to get ever so slightly
+slower, again due to more tags. The total net change is about as close to zero
+as we can get, so the end effect seems to be simply more density and no
+real performance change.
+
+The comment about not changing kBlockSize, scary as it is, is not really
+relevant, since we're never going to have a block-level decompressor without
+explicitly marked blocks. Replace it with something more appropriate.
+
+This affects the framing format, but it's okay to change it since it basically
+has no users yet.
+
+
+Density (note that cp, c, lsp and man are all smaller than 32 kB):
+
+ Benchmark Description Base (%) New (%) Improvement
+ --------------------------------------------------------------
+ ZFlat/0 html 22.57 22.31 +5.6%
+ ZFlat/1 urls 50.89 47.77 +6.5%
+ ZFlat/2 jpg 99.88 99.87 +0.0%
+ ZFlat/3 pdf 82.13 82.07 +0.1%
+ ZFlat/4 html4 23.55 22.51 +4.6%
+ ZFlat/5 cp 48.12 48.12 +0.0%
+ ZFlat/6 c 42.40 42.40 +0.0%
+ ZFlat/7 lsp 48.37 48.37 +0.0%
+ ZFlat/8 xls 41.34 41.23 +0.3%
+ ZFlat/9 txt1 59.81 57.87 +3.4%
+ ZFlat/10 txt2 64.07 61.93 +3.5%
+ ZFlat/11 txt3 57.11 54.92 +4.0%
+ ZFlat/12 txt4 68.35 66.22 +3.2%
+ ZFlat/13 bin 18.21 18.11 +0.6%
+ ZFlat/14 sum 51.88 48.96 +6.0%
+ ZFlat/15 man 59.36 59.36 +0.0%
+ ZFlat/16 pb 23.15 19.64 +17.9%
+ ZFlat/17 gaviota 38.27 37.72 +1.5%
+ Geometric mean 45.51 44.15 +3.1%
+
+
+Microbenchmarks (64-bit, opt):
+
+Westmere 2.8 GHz:
+
+ Benchmark Base (ns) New (ns) Improvement
+ -------------------------------------------------------------------------------------------------
+ BM_UFlat/0 75342 75027 1.3GB/s html +0.4%
+ BM_UFlat/1 723767 744269 899.6MB/s urls -2.8%
+ BM_UFlat/2 10072 10072 11.7GB/s jpg +0.0%
+ BM_UFlat/3 30747 30388 2.9GB/s pdf +1.2%
+ BM_UFlat/4 307353 306063 1.2GB/s html4 +0.4%
+ BM_UFlat/5 28593 28743 816.3MB/s cp -0.5%
+ BM_UFlat/6 12958 12998 818.1MB/s c -0.3%
+ BM_UFlat/7 3700 3792 935.8MB/s lsp -2.4%
+ BM_UFlat/8 999685 999905 982.1MB/s xls -0.0%
+ BM_UFlat/9 232954 230079 630.4MB/s txt1 +1.2%
+ BM_UFlat/10 200785 201468 592.6MB/s txt2 -0.3%
+ BM_UFlat/11 617267 610968 666.1MB/s txt3 +1.0%
+ BM_UFlat/12 821595 822475 558.7MB/s txt4 -0.1%
+ BM_UFlat/13 377097 377632 1.3GB/s bin -0.1%
+ BM_UFlat/14 45476 45260 805.8MB/s sum +0.5%
+ BM_UFlat/15 4985 5003 805.7MB/s man -0.4%
+ BM_UFlat/16 80813 77494 1.4GB/s pb +4.3%
+ BM_UFlat/17 251792 241553 727.7MB/s gaviota +4.2%
+ BM_UValidate/0 40343 40354 2.4GB/s html -0.0%
+ BM_UValidate/1 426890 451574 1.4GB/s urls -5.5%
+ BM_UValidate/2 187 179 661.9GB/s jpg +4.5%
+ BM_UValidate/3 13783 13827 6.4GB/s pdf -0.3%
+ BM_UValidate/4 162393 163335 2.3GB/s html4 -0.6%
+ BM_UDataBuffer/0 93756 93302 1046.7MB/s html +0.5%
+ BM_UDataBuffer/1 886714 916292 730.7MB/s urls -3.2%
+ BM_UDataBuffer/2 15861 16401 7.2GB/s jpg -3.3%
+ BM_UDataBuffer/3 38934 39224 2.2GB/s pdf -0.7%
+ BM_UDataBuffer/4 381008 379428 1029.5MB/s html4 +0.4%
+ BM_UCord/0 92528 91098 1072.0MB/s html +1.6%
+ BM_UCord/1 858421 885287 756.3MB/s urls -3.0%
+ BM_UCord/2 13140 13464 8.8GB/s jpg -2.4%
+ BM_UCord/3 39012 37773 2.3GB/s pdf +3.3%
+ BM_UCord/4 376869 371267 1052.1MB/s html4 +1.5%
+ BM_UCordString/0 75810 75303 1.3GB/s html +0.7%
+ BM_UCordString/1 735290 753841 888.2MB/s urls -2.5%
+ BM_UCordString/2 11945 13113 9.0GB/s jpg -8.9%
+ BM_UCordString/3 33901 32562 2.7GB/s pdf +4.1%
+ BM_UCordString/4 310985 309390 1.2GB/s html4 +0.5%
+ BM_UCordValidate/0 40952 40450 2.4GB/s html +1.2%
+ BM_UCordValidate/1 433842 456531 1.4GB/s urls -5.0%
+ BM_UCordValidate/2 1179 1173 100.8GB/s jpg +0.5%
+ BM_UCordValidate/3 14481 14392 6.1GB/s pdf +0.6%
+ BM_UCordValidate/4 164364 164151 2.3GB/s html4 +0.1%
+ BM_ZFlat/0 160610 156601 623.6MB/s html (22.31 %) +2.6%
+ BM_ZFlat/1 1995238 1993582 335.9MB/s urls (47.77 %) +0.1%
+ BM_ZFlat/2 30133 24983 4.7GB/s jpg (99.87 %) +20.6%
+ BM_ZFlat/3 74453 73128 1.2GB/s pdf (82.07 %) +1.8%
+ BM_ZFlat/4 647674 633729 616.4MB/s html4 (22.51 %) +2.2%
+ BM_ZFlat/5 76259 76090 308.4MB/s cp (48.12 %) +0.2%
+ BM_ZFlat/6 31106 31084 342.1MB/s c (42.40 %) +0.1%
+ BM_ZFlat/7 10507 10443 339.8MB/s lsp (48.37 %) +0.6%
+ BM_ZFlat/8 1811047 1793325 547.6MB/s xls (41.23 %) +1.0%
+ BM_ZFlat/9 597903 581793 249.3MB/s txt1 (57.87 %) +2.8%
+ BM_ZFlat/10 525320 514522 232.0MB/s txt2 (61.93 %) +2.1%
+ BM_ZFlat/11 1596591 1551636 262.3MB/s txt3 (54.92 %) +2.9%
+ BM_ZFlat/12 2134523 2094033 219.5MB/s txt4 (66.22 %) +1.9%
+ BM_ZFlat/13 593024 587869 832.6MB/s bin (18.11 %) +0.9%
+ BM_ZFlat/14 114746 110666 329.5MB/s sum (48.96 %) +3.7%
+ BM_ZFlat/15 14376 14485 278.3MB/s man (59.36 %) -0.8%
+ BM_ZFlat/16 167908 150070 753.6MB/s pb (19.64 %) +11.9%
+ BM_ZFlat/17 460228 442253 397.5MB/s gaviota (37.72 %) +4.1%
+ BM_ZCord/0 164896 160241 609.4MB/s html +2.9%
+ BM_ZCord/1 2070239 2043492 327.7MB/s urls +1.3%
+ BM_ZCord/2 54402 47002 2.5GB/s jpg +15.7%
+ BM_ZCord/3 85871 83832 1073.1MB/s pdf +2.4%
+ BM_ZCord/4 664078 648825 602.0MB/s html4 +2.4%
+ BM_ZDataBuffer/0 174874 172549 566.0MB/s html +1.3%
+ BM_ZDataBuffer/1 2134410 2139173 313.0MB/s urls -0.2%
+ BM_ZDataBuffer/2 71911 69551 1.7GB/s jpg +3.4%
+ BM_ZDataBuffer/3 98236 99727 902.1MB/s pdf -1.5%
+ BM_ZDataBuffer/4 710776 699104 558.8MB/s html4 +1.7%
+ Sum of all benchmarks 27358908 27200688 +0.6%
+
+
+Sandy Bridge 2.6 GHz:
+
+ Benchmark Base (ns) New (ns) Improvement
+ -------------------------------------------------------------------------------------------------
+ BM_UFlat/0 49356 49018 1.9GB/s html +0.7%
+ BM_UFlat/1 516764 531955 1.2GB/s urls -2.9%
+ BM_UFlat/2 6982 7304 16.2GB/s jpg -4.4%
+ BM_UFlat/3 15285 15598 5.6GB/s pdf -2.0%
+ BM_UFlat/4 206557 206669 1.8GB/s html4 -0.1%
+ BM_UFlat/5 13681 13567 1.7GB/s cp +0.8%
+ BM_UFlat/6 6571 6592 1.6GB/s c -0.3%
+ BM_UFlat/7 2008 1994 1.7GB/s lsp +0.7%
+ BM_UFlat/8 775700 773286 1.2GB/s xls +0.3%
+ BM_UFlat/9 165578 164480 881.8MB/s txt1 +0.7%
+ BM_UFlat/10 143707 144139 828.2MB/s txt2 -0.3%
+ BM_UFlat/11 443026 436281 932.8MB/s txt3 +1.5%
+ BM_UFlat/12 603129 595856 771.2MB/s txt4 +1.2%
+ BM_UFlat/13 271682 270450 1.8GB/s bin +0.5%
+ BM_UFlat/14 26200 25666 1.4GB/s sum +2.1%
+ BM_UFlat/15 2620 2608 1.5GB/s man +0.5%
+ BM_UFlat/16 48908 47756 2.3GB/s pb +2.4%
+ BM_UFlat/17 174638 170346 1031.9MB/s gaviota +2.5%
+ BM_UValidate/0 31922 31898 3.0GB/s html +0.1%
+ BM_UValidate/1 341265 363554 1.8GB/s urls -6.1%
+ BM_UValidate/2 160 151 782.8GB/s jpg +6.0%
+ BM_UValidate/3 10402 10380 8.5GB/s pdf +0.2%
+ BM_UValidate/4 129490 130587 2.9GB/s html4 -0.8%
+ BM_UDataBuffer/0 59383 58736 1.6GB/s html +1.1%
+ BM_UDataBuffer/1 619222 637786 1049.8MB/s urls -2.9%
+ BM_UDataBuffer/2 10775 11941 9.9GB/s jpg -9.8%
+ BM_UDataBuffer/3 18002 17930 4.9GB/s pdf +0.4%
+ BM_UDataBuffer/4 259182 259306 1.5GB/s html4 -0.0%
+ BM_UCord/0 59379 57814 1.6GB/s html +2.7%
+ BM_UCord/1 598456 615162 1088.4MB/s urls -2.7%
+ BM_UCord/2 8519 8628 13.7GB/s jpg -1.3%
+ BM_UCord/3 18123 17537 5.0GB/s pdf +3.3%
+ BM_UCord/4 252375 252331 1.5GB/s html4 +0.0%
+ BM_UCordString/0 49494 49790 1.9GB/s html -0.6%
+ BM_UCordString/1 524659 541803 1.2GB/s urls -3.2%
+ BM_UCordString/2 8206 8354 14.2GB/s jpg -1.8%
+ BM_UCordString/3 17235 16537 5.3GB/s pdf +4.2%
+ BM_UCordString/4 210188 211072 1.8GB/s html4 -0.4%
+ BM_UCordValidate/0 31956 31587 3.0GB/s html +1.2%
+ BM_UCordValidate/1 340828 362141 1.8GB/s urls -5.9%
+ BM_UCordValidate/2 783 744 158.9GB/s jpg +5.2%
+ BM_UCordValidate/3 10543 10462 8.4GB/s pdf +0.8%
+ BM_UCordValidate/4 130150 129789 2.9GB/s html4 +0.3%
+ BM_ZFlat/0 113873 111200 878.2MB/s html (22.31 %) +2.4%
+ BM_ZFlat/1 1473023 1489858 449.4MB/s urls (47.77 %) -1.1%
+ BM_ZFlat/2 23569 19486 6.1GB/s jpg (99.87 %) +21.0%
+ BM_ZFlat/3 49178 48046 1.8GB/s pdf (82.07 %) +2.4%
+ BM_ZFlat/4 475063 469394 832.2MB/s html4 (22.51 %) +1.2%
+ BM_ZFlat/5 46910 46816 501.2MB/s cp (48.12 %) +0.2%
+ BM_ZFlat/6 16883 16916 628.6MB/s c (42.40 %) -0.2%
+ BM_ZFlat/7 5381 5447 651.5MB/s lsp (48.37 %) -1.2%
+ BM_ZFlat/8 1466870 1473861 666.3MB/s xls (41.23 %) -0.5%
+ BM_ZFlat/9 468006 464101 312.5MB/s txt1 (57.87 %) +0.8%
+ BM_ZFlat/10 408157 408957 291.9MB/s txt2 (61.93 %) -0.2%
+ BM_ZFlat/11 1253348 1232910 330.1MB/s txt3 (54.92 %) +1.7%
+ BM_ZFlat/12 1702373 1702977 269.8MB/s txt4 (66.22 %) -0.0%
+ BM_ZFlat/13 439792 438557 1116.0MB/s bin (18.11 %) +0.3%
+ BM_ZFlat/14 80766 78851 462.5MB/s sum (48.96 %) +2.4%
+ BM_ZFlat/15 7420 7542 534.5MB/s man (59.36 %) -1.6%
+ BM_ZFlat/16 112043 100126 1.1GB/s pb (19.64 %) +11.9%
+ BM_ZFlat/17 368877 357703 491.4MB/s gaviota (37.72 %) +3.1%
+ BM_ZCord/0 116402 113564 859.9MB/s html +2.5%
+ BM_ZCord/1 1507156 1519911 440.5MB/s urls -0.8%
+ BM_ZCord/2 39860 33686 3.5GB/s jpg +18.3%
+ BM_ZCord/3 56211 54694 1.6GB/s pdf +2.8%
+ BM_ZCord/4 485594 479212 815.1MB/s html4 +1.3%
+ BM_ZDataBuffer/0 123185 121572 803.3MB/s html +1.3%
+ BM_ZDataBuffer/1 1569111 1589380 421.3MB/s urls -1.3%
+ BM_ZDataBuffer/2 53143 49556 2.4GB/s jpg +7.2%
+ BM_ZDataBuffer/3 65725 66826 1.3GB/s pdf -1.6%
+ BM_ZDataBuffer/4 517871 514750 758.9MB/s html4 +0.6%
+ Sum of all benchmarks 20258879 20315484 -0.3%
+
+
+AMD Instanbul 2.4 GHz:
+
+ Benchmark Base (ns) New (ns) Improvement
+ -------------------------------------------------------------------------------------------------
+ BM_UFlat/0 97120 96585 1011.1MB/s html +0.6%
+ BM_UFlat/1 917473 948016 706.3MB/s urls -3.2%
+ BM_UFlat/2 21496 23938 4.9GB/s jpg -10.2%
+ BM_UFlat/3 44751 45639 1.9GB/s pdf -1.9%
+ BM_UFlat/4 391950 391413 998.0MB/s html4 +0.1%
+ BM_UFlat/5 37366 37201 630.7MB/s cp +0.4%
+ BM_UFlat/6 18350 18318 580.5MB/s c +0.2%
+ BM_UFlat/7 5672 5661 626.9MB/s lsp +0.2%
+ BM_UFlat/8 1533390 1529441 642.1MB/s xls +0.3%
+ BM_UFlat/9 335477 336553 431.0MB/s txt1 -0.3%
+ BM_UFlat/10 285140 292080 408.7MB/s txt2 -2.4%
+ BM_UFlat/11 888507 894758 454.9MB/s txt3 -0.7%
+ BM_UFlat/12 1187643 1210928 379.5MB/s txt4 -1.9%
+ BM_UFlat/13 493717 507447 964.5MB/s bin -2.7%
+ BM_UFlat/14 61740 60870 599.1MB/s sum +1.4%
+ BM_UFlat/15 7211 7187 560.9MB/s man +0.3%
+ BM_UFlat/16 97435 93100 1.2GB/s pb +4.7%
+ BM_UFlat/17 362662 356395 493.2MB/s gaviota +1.8%
+ BM_UValidate/0 47475 47118 2.0GB/s html +0.8%
+ BM_UValidate/1 501304 529741 1.2GB/s urls -5.4%
+ BM_UValidate/2 276 243 486.2GB/s jpg +13.6%
+ BM_UValidate/3 16361 16261 5.4GB/s pdf +0.6%
+ BM_UValidate/4 190741 190353 2.0GB/s html4 +0.2%
+ BM_UDataBuffer/0 111080 109771 889.6MB/s html +1.2%
+ BM_UDataBuffer/1 1051035 1085999 616.5MB/s urls -3.2%
+ BM_UDataBuffer/2 25801 25463 4.6GB/s jpg +1.3%
+ BM_UDataBuffer/3 50493 49946 1.8GB/s pdf +1.1%
+ BM_UDataBuffer/4 447258 444138 879.5MB/s html4 +0.7%
+ BM_UCord/0 109350 107909 905.0MB/s html +1.3%
+ BM_UCord/1 1023396 1054964 634.7MB/s urls -3.0%
+ BM_UCord/2 25292 24371 4.9GB/s jpg +3.8%
+ BM_UCord/3 48955 49736 1.8GB/s pdf -1.6%
+ BM_UCord/4 440452 437331 893.2MB/s html4 +0.7%
+ BM_UCordString/0 98511 98031 996.2MB/s html +0.5%
+ BM_UCordString/1 933230 963495 694.9MB/s urls -3.1%
+ BM_UCordString/2 23311 24076 4.9GB/s jpg -3.2%
+ BM_UCordString/3 45568 46196 1.9GB/s pdf -1.4%
+ BM_UCordString/4 397791 396934 984.1MB/s html4 +0.2%
+ BM_UCordValidate/0 47537 46921 2.0GB/s html +1.3%
+ BM_UCordValidate/1 505071 532716 1.2GB/s urls -5.2%
+ BM_UCordValidate/2 1663 1621 72.9GB/s jpg +2.6%
+ BM_UCordValidate/3 16890 16926 5.2GB/s pdf -0.2%
+ BM_UCordValidate/4 192365 191984 2.0GB/s html4 +0.2%
+ BM_ZFlat/0 184708 179103 545.3MB/s html (22.31 %) +3.1%
+ BM_ZFlat/1 2293864 2302950 290.7MB/s urls (47.77 %) -0.4%
+ BM_ZFlat/2 52852 47618 2.5GB/s jpg (99.87 %) +11.0%
+ BM_ZFlat/3 100766 96179 935.3MB/s pdf (82.07 %) +4.8%
+ BM_ZFlat/4 741220 727977 536.6MB/s html4 (22.51 %) +1.8%
+ BM_ZFlat/5 85402 85418 274.7MB/s cp (48.12 %) -0.0%
+ BM_ZFlat/6 36558 36494 291.4MB/s c (42.40 %) +0.2%
+ BM_ZFlat/7 12706 12507 283.7MB/s lsp (48.37 %) +1.6%
+ BM_ZFlat/8 2336823 2335688 420.5MB/s xls (41.23 %) +0.0%
+ BM_ZFlat/9 701804 681153 212.9MB/s txt1 (57.87 %) +3.0%
+ BM_ZFlat/10 606700 597194 199.9MB/s txt2 (61.93 %) +1.6%
+ BM_ZFlat/11 1852283 1803238 225.7MB/s txt3 (54.92 %) +2.7%
+ BM_ZFlat/12 2475527 2443354 188.1MB/s txt4 (66.22 %) +1.3%
+ BM_ZFlat/13 694497 696654 702.6MB/s bin (18.11 %) -0.3%
+ BM_ZFlat/14 136929 129855 280.8MB/s sum (48.96 %) +5.4%
+ BM_ZFlat/15 17172 17124 235.4MB/s man (59.36 %) +0.3%
+ BM_ZFlat/16 190364 171763 658.4MB/s pb (19.64 %) +10.8%
+ BM_ZFlat/17 567285 555190 316.6MB/s gaviota (37.72 %) +2.2%
+ BM_ZCord/0 193490 187031 522.1MB/s html +3.5%
+ BM_ZCord/1 2427537 2415315 277.2MB/s urls +0.5%
+ BM_ZCord/2 85378 81412 1.5GB/s jpg +4.9%
+ BM_ZCord/3 121898 119419 753.3MB/s pdf +2.1%
+ BM_ZCord/4 779564 762961 512.0MB/s html4 +2.2%
+ BM_ZDataBuffer/0 213820 207272 471.1MB/s html +3.2%
+ BM_ZDataBuffer/1 2589010 2586495 258.9MB/s urls +0.1%
+ BM_ZDataBuffer/2 121871 118885 1018.4MB/s jpg +2.5%
+ BM_ZDataBuffer/3 145382 145986 616.2MB/s pdf -0.4%
+ BM_ZDataBuffer/4 868117 852754 458.1MB/s html4 +1.8%
+ Sum of all benchmarks 33771833 33744763 +0.1%
+
+------------------------------------------------------------------------
+r70 | snappy.mirrorbot@gmail.com | 2013-01-06 20:21:26 +0100 (Sun, 06 Jan 2013) | 6 lines
+
+Adjust the Snappy open-source distribution for the changes in Google's
+internal file API.
+
+R=sanjay
+
+
+------------------------------------------------------------------------
+r69 | snappy.mirrorbot@gmail.com | 2013-01-04 12:54:20 +0100 (Fri, 04 Jan 2013) | 15 lines
+
+Change a few ORs to additions where they don't matter. This helps the compiler
+use the LEA instruction more efficiently, since e.g. a + (b << 2) can be encoded
+as one instruction. Even more importantly, it can constant-fold the
+COPY_* enums together with the shifted negative constants, which also saves
+some instructions. (We don't need it for LITERAL, since it happens to be 0.)
+
+I am unsure why the compiler couldn't do this itself, but the theory is that
+it cannot prove that len-1 and len-4 cannot underflow/wrap, and thus can't
+do the optimization safely.
+
+The gains are small but measurable; 0.5-1.0% over the BM_Z* benchmarks
+(measured on Westmere, Sandy Bridge and Istanbul).
+
+R=sanjay
+
+------------------------------------------------------------------------
+r68 | snappy.mirrorbot@gmail.com | 2012-10-08 13:37:16 +0200 (Mon, 08 Oct 2012) | 5 lines
+
+Stop giving -Werror to automake, due to an incompatibility between current
+versions of libtool and automake on non-GNU platforms (e.g. Mac OS X).
+
+R=sanjay
+
+------------------------------------------------------------------------
+r67 | snappy.mirrorbot@gmail.com | 2012-08-17 15:54:47 +0200 (Fri, 17 Aug 2012) | 5 lines
+
+Fix public issue 66: Document GetUncompressedLength better, in particular that
+it leaves the source in a state that's not appropriate for RawUncompress.
+
+R=sanjay
+
+------------------------------------------------------------------------
+r66 | snappy.mirrorbot@gmail.com | 2012-07-31 13:44:44 +0200 (Tue, 31 Jul 2012) | 5 lines
+
+Fix public issue 64: Check for <sys/time.h> at configure time,
+since MSVC seemingly does not have it.
+
+R=sanjay
+
+------------------------------------------------------------------------
+r65 | snappy.mirrorbot@gmail.com | 2012-07-04 11:34:48 +0200 (Wed, 04 Jul 2012) | 10 lines
+
+Handle the case where gettimeofday() goes backwards or returns the same value
+twice; it could cause division by zero in the unit test framework.
+(We already had one fix for this in place, but it was incomplete.)
+
+This could in theory happen on any system, since there are few guarantees
+about gettimeofday(), but seems to only happen in practice on GNU/Hurd, where
+gettimeofday() is cached and only updated ever so often.
+
+R=sanjay
+
+------------------------------------------------------------------------
+r64 | snappy.mirrorbot@gmail.com | 2012-07-04 11:28:33 +0200 (Wed, 04 Jul 2012) | 6 lines
+
+Mark ARMv4 as not supporting unaligned accesses (not just ARMv5 and ARMv6);
+apparently Debian still targets these by default, giving us segfaults on
+armel.
+
+R=sanjay
+
+------------------------------------------------------------------------
+r63 | snappy.mirrorbot@gmail.com | 2012-05-22 11:46:05 +0200 (Tue, 22 May 2012) | 5 lines
+
+Fix public bug #62: Remove an extraneous comma at the end of an enum list,
+causing compile errors when embedded in Mozilla on OpenBSD.
+
+R=sanjay
+
+------------------------------------------------------------------------
+r62 | snappy.mirrorbot@gmail.com | 2012-05-22 11:32:50 +0200 (Tue, 22 May 2012) | 8 lines
+
+Snappy library no longer depends on iostream.
+
+Achieved by moving logging macro definitions to a test-only
+header file, and by changing non-test code to use assert,
+fprintf, and abort instead of LOG/CHECK macros.
+
+R=sesse
+
+------------------------------------------------------------------------
+r61 | snappy.mirrorbot@gmail.com | 2012-02-24 16:46:37 +0100 (Fri, 24 Feb 2012) | 4 lines
+
+Release Snappy 1.0.5.
+
+R=sanjay
+
+------------------------------------------------------------------------
+r60 | snappy.mirrorbot@gmail.com | 2012-02-23 18:00:36 +0100 (Thu, 23 Feb 2012) | 57 lines
+
+For 32-bit platforms, do not try to accelerate multiple neighboring
+32-bit loads with a 64-bit load during compression (it's not a win).
+
+The main target for this optimization is ARM, but 32-bit x86 gets
+a small gain, too, although there is noise in the microbenchmarks.
+It's a no-op for 64-bit x86. It does not affect decompression.
+
+Microbenchmark results on a Cortex-A9 1GHz, using g++ 4.6.2 (from
+Ubuntu/Linaro), -O2 -DNDEBUG -Wa,-march=armv7a -mtune=cortex-a9
+-mthumb-interwork, minimum 1000 iterations:
+
+ Benchmark Time(ns) CPU(ns) Iterations
+ ---------------------------------------------------
+ BM_ZFlat/0 1158277 1160000 1000 84.2MB/s html (23.57 %) [ +4.3%]
+ BM_ZFlat/1 14861782 14860000 1000 45.1MB/s urls (50.89 %) [ +1.1%]
+ BM_ZFlat/2 393595 390000 1000 310.5MB/s jpg (99.88 %) [ +0.0%]
+ BM_ZFlat/3 650583 650000 1000 138.4MB/s pdf (82.13 %) [ +3.1%]
+ BM_ZFlat/4 4661480 4660000 1000 83.8MB/s html4 (23.55 %) [ +4.3%]
+ BM_ZFlat/5 491973 490000 1000 47.9MB/s cp (48.12 %) [ +2.0%]
+ BM_ZFlat/6 193575 192678 1038 55.2MB/s c (42.40 %) [ +9.0%]
+ BM_ZFlat/7 62343 62754 3187 56.5MB/s lsp (48.37 %) [ +2.6%]
+ BM_ZFlat/8 17708468 17710000 1000 55.5MB/s xls (41.34 %) [ -0.3%]
+ BM_ZFlat/9 3755345 3760000 1000 38.6MB/s txt1 (59.81 %) [ +8.2%]
+ BM_ZFlat/10 3324217 3320000 1000 36.0MB/s txt2 (64.07 %) [ +4.2%]
+ BM_ZFlat/11 10139932 10140000 1000 40.1MB/s txt3 (57.11 %) [ +6.4%]
+ BM_ZFlat/12 13532109 13530000 1000 34.0MB/s txt4 (68.35 %) [ +5.0%]
+ BM_ZFlat/13 4690847 4690000 1000 104.4MB/s bin (18.21 %) [ +4.1%]
+ BM_ZFlat/14 830682 830000 1000 43.9MB/s sum (51.88 %) [ +1.2%]
+ BM_ZFlat/15 84784 85011 2235 47.4MB/s man (59.36 %) [ +1.1%]
+ BM_ZFlat/16 1293254 1290000 1000 87.7MB/s pb (23.15 %) [ +2.3%]
+ BM_ZFlat/17 2775155 2780000 1000 63.2MB/s gaviota (38.27 %) [+12.2%]
+
+Core i7 in 32-bit mode (only one run and 100 iterations, though, so noisy):
+
+ Benchmark Time(ns) CPU(ns) Iterations
+ ---------------------------------------------------
+ BM_ZFlat/0 227582 223464 3043 437.0MB/s html (23.57 %) [ +7.4%]
+ BM_ZFlat/1 2982430 2918455 233 229.4MB/s urls (50.89 %) [ +2.9%]
+ BM_ZFlat/2 46967 46658 15217 2.5GB/s jpg (99.88 %) [ +0.0%]
+ BM_ZFlat/3 115298 114864 5833 783.2MB/s pdf (82.13 %) [ +1.5%]
+ BM_ZFlat/4 913440 899743 778 434.2MB/s html4 (23.55 %) [ +0.3%]
+ BM_ZFlat/5 110302 108571 7000 216.1MB/s cp (48.12 %) [ +0.0%]
+ BM_ZFlat/6 44409 43372 15909 245.2MB/s c (42.40 %) [ +0.8%]
+ BM_ZFlat/7 15713 15643 46667 226.9MB/s lsp (48.37 %) [ +2.7%]
+ BM_ZFlat/8 2625539 2602230 269 377.4MB/s xls (41.34 %) [ +1.4%]
+ BM_ZFlat/9 808884 811429 875 178.8MB/s txt1 (59.81 %) [ -3.9%]
+ BM_ZFlat/10 709532 700000 1000 170.5MB/s txt2 (64.07 %) [ +0.0%]
+ BM_ZFlat/11 2177682 2162162 333 188.2MB/s txt3 (57.11 %) [ -1.4%]
+ BM_ZFlat/12 2849640 2840000 250 161.8MB/s txt4 (68.35 %) [ -1.4%]
+ BM_ZFlat/13 849760 835476 778 585.8MB/s bin (18.21 %) [ +1.2%]
+ BM_ZFlat/14 165940 164571 4375 221.6MB/s sum (51.88 %) [ +1.4%]
+ BM_ZFlat/15 20939 20571 35000 196.0MB/s man (59.36 %) [ +2.1%]
+ BM_ZFlat/16 239209 236544 2917 478.1MB/s pb (23.15 %) [ +4.2%]
+ BM_ZFlat/17 616206 610000 1000 288.2MB/s gaviota (38.27 %) [ -1.6%]
+
+R=sanjay
+
+------------------------------------------------------------------------
+r59 | snappy.mirrorbot@gmail.com | 2012-02-21 18:02:17 +0100 (Tue, 21 Feb 2012) | 107 lines
+
+Enable the use of unaligned loads and stores for ARM-based architectures
+where they are available (ARMv7 and higher). This gives a significant
+speed boost on ARM, both for compression and decompression.
+It should not affect x86 at all.
+
+There are more changes possible to speed up ARM, but it might not be
+that easy to do without hurting x86 or making the code uglier.
+Also, we de not try to use NEON yet.
+
+Microbenchmark results on a Cortex-A9 1GHz, using g++ 4.6.2 (from Ubuntu/Linaro),
+-O2 -DNDEBUG -Wa,-march=armv7a -mtune=cortex-a9 -mthumb-interwork:
+
+Benchmark Time(ns) CPU(ns) Iterations
+---------------------------------------------------
+BM_UFlat/0 524806 529100 378 184.6MB/s html [+33.6%]
+BM_UFlat/1 5139790 5200000 100 128.8MB/s urls [+28.8%]
+BM_UFlat/2 86540 84166 1901 1.4GB/s jpg [ +0.6%]
+BM_UFlat/3 215351 210176 904 428.0MB/s pdf [+29.8%]
+BM_UFlat/4 2144490 2100000 100 186.0MB/s html4 [+33.3%]
+BM_UFlat/5 194482 190000 1000 123.5MB/s cp [+36.2%]
+BM_UFlat/6 91843 90175 2107 117.9MB/s c [+38.6%]
+BM_UFlat/7 28535 28426 6684 124.8MB/s lsp [+34.7%]
+BM_UFlat/8 9206600 9200000 100 106.7MB/s xls [+42.4%]
+BM_UFlat/9 1865273 1886792 106 76.9MB/s txt1 [+32.5%]
+BM_UFlat/10 1576809 1587301 126 75.2MB/s txt2 [+32.3%]
+BM_UFlat/11 4968450 4900000 100 83.1MB/s txt3 [+32.7%]
+BM_UFlat/12 6673970 6700000 100 68.6MB/s txt4 [+32.8%]
+BM_UFlat/13 2391470 2400000 100 203.9MB/s bin [+29.2%]
+BM_UFlat/14 334601 344827 522 105.8MB/s sum [+30.6%]
+BM_UFlat/15 37404 38080 5252 105.9MB/s man [+33.8%]
+BM_UFlat/16 535470 540540 370 209.2MB/s pb [+31.2%]
+BM_UFlat/17 1875245 1886792 106 93.2MB/s gaviota [+37.8%]
+BM_UValidate/0 178425 179533 1114 543.9MB/s html [ +2.7%]
+BM_UValidate/1 2100450 2000000 100 334.8MB/s urls [ +5.0%]
+BM_UValidate/2 1039 1044 172413 113.3GB/s jpg [ +3.4%]
+BM_UValidate/3 59423 59470 3363 1.5GB/s pdf [ +7.8%]
+BM_UValidate/4 760716 766283 261 509.8MB/s html4 [ +6.5%]
+BM_ZFlat/0 1204632 1204819 166 81.1MB/s html (23.57 %) [+32.8%]
+BM_ZFlat/1 15656190 15600000 100 42.9MB/s urls (50.89 %) [+27.6%]
+BM_ZFlat/2 403336 410677 487 294.8MB/s jpg (99.88 %) [+16.5%]
+BM_ZFlat/3 664073 671140 298 134.0MB/s pdf (82.13 %) [+28.4%]
+BM_ZFlat/4 4961940 4900000 100 79.7MB/s html4 (23.55 %) [+30.6%]
+BM_ZFlat/5 500664 501253 399 46.8MB/s cp (48.12 %) [+33.4%]
+BM_ZFlat/6 217276 215982 926 49.2MB/s c (42.40 %) [+25.0%]
+BM_ZFlat/7 64122 65487 3054 54.2MB/s lsp (48.37 %) [+36.1%]
+BM_ZFlat/8 18045730 18000000 100 54.6MB/s xls (41.34 %) [+34.4%]
+BM_ZFlat/9 4051530 4000000 100 36.3MB/s txt1 (59.81 %) [+25.0%]
+BM_ZFlat/10 3451800 3500000 100 34.1MB/s txt2 (64.07 %) [+25.7%]
+BM_ZFlat/11 11052340 11100000 100 36.7MB/s txt3 (57.11 %) [+24.3%]
+BM_ZFlat/12 14538690 14600000 100 31.5MB/s txt4 (68.35 %) [+24.7%]
+BM_ZFlat/13 5041850 5000000 100 97.9MB/s bin (18.21 %) [+32.0%]
+BM_ZFlat/14 908840 909090 220 40.1MB/s sum (51.88 %) [+22.2%]
+BM_ZFlat/15 86921 86206 1972 46.8MB/s man (59.36 %) [+42.2%]
+BM_ZFlat/16 1312315 1315789 152 86.0MB/s pb (23.15 %) [+34.5%]
+BM_ZFlat/17 3173120 3200000 100 54.9MB/s gaviota (38.27%) [+28.1%]
+
+
+The move from 64-bit to 32-bit operations for the copies also affected 32-bit x86;
+positive on the decompression side, and slightly negative on the compression side
+(unless that is noise; I only ran once):
+
+Benchmark Time(ns) CPU(ns) Iterations
+-----------------------------------------------------
+BM_UFlat/0 86279 86140 7778 1.1GB/s html [ +7.5%]
+BM_UFlat/1 839265 822622 778 813.9MB/s urls [ +9.4%]
+BM_UFlat/2 9180 9143 87500 12.9GB/s jpg [ +1.2%]
+BM_UFlat/3 35080 35000 20000 2.5GB/s pdf [+10.1%]
+BM_UFlat/4 350318 345000 2000 1.1GB/s html4 [ +7.0%]
+BM_UFlat/5 33808 33472 21212 701.0MB/s cp [ +9.0%]
+BM_UFlat/6 15201 15214 46667 698.9MB/s c [+14.9%]
+BM_UFlat/7 4652 4651 159091 762.9MB/s lsp [ +7.5%]
+BM_UFlat/8 1285551 1282528 538 765.7MB/s xls [+10.7%]
+BM_UFlat/9 282510 281690 2414 514.9MB/s txt1 [+13.6%]
+BM_UFlat/10 243494 239286 2800 498.9MB/s txt2 [+14.4%]
+BM_UFlat/11 743625 740000 1000 550.0MB/s txt3 [+14.3%]
+BM_UFlat/12 999441 989717 778 464.3MB/s txt4 [+16.1%]
+BM_UFlat/13 412402 410076 1707 1.2GB/s bin [ +7.3%]
+BM_UFlat/14 54876 54000 10000 675.3MB/s sum [+13.0%]
+BM_UFlat/15 6146 6100 100000 660.8MB/s man [+14.8%]
+BM_UFlat/16 90496 90286 8750 1.2GB/s pb [ +4.0%]
+BM_UFlat/17 292650 292000 2500 602.0MB/s gaviota [+18.1%]
+BM_UValidate/0 49620 49699 14286 1.9GB/s html [ +0.0%]
+BM_UValidate/1 501371 500000 1000 1.3GB/s urls [ +0.0%]
+BM_UValidate/2 232 227 3043478 521.5GB/s jpg [ +1.3%]
+BM_UValidate/3 17250 17143 43750 5.1GB/s pdf [ -1.3%]
+BM_UValidate/4 198643 200000 3500 1.9GB/s html4 [ -0.9%]
+BM_ZFlat/0 227128 229415 3182 425.7MB/s html (23.57 %) [ -1.4%]
+BM_ZFlat/1 2970089 2960000 250 226.2MB/s urls (50.89 %) [ -1.9%]
+BM_ZFlat/2 45683 44999 15556 2.6GB/s jpg (99.88 %) [ +2.2%]
+BM_ZFlat/3 114661 113136 6364 795.1MB/s pdf (82.13 %) [ -1.5%]
+BM_ZFlat/4 919702 914286 875 427.2MB/s html4 (23.55%) [ -1.3%]
+BM_ZFlat/5 108189 108422 6364 216.4MB/s cp (48.12 %) [ -1.2%]
+BM_ZFlat/6 44525 44000 15909 241.7MB/s c (42.40 %) [ -2.9%]
+BM_ZFlat/7 15973 15857 46667 223.8MB/s lsp (48.37 %) [ +0.0%]
+BM_ZFlat/8 2677888 2639405 269 372.1MB/s xls (41.34 %) [ -1.4%]
+BM_ZFlat/9 800715 780000 1000 186.0MB/s txt1 (59.81 %) [ -0.4%]
+BM_ZFlat/10 700089 700000 1000 170.5MB/s txt2 (64.07 %) [ -2.9%]
+BM_ZFlat/11 2159356 2138365 318 190.3MB/s txt3 (57.11 %) [ -0.3%]
+BM_ZFlat/12 2796143 2779923 259 165.3MB/s txt4 (68.35 %) [ -1.4%]
+BM_ZFlat/13 856458 835476 778 585.8MB/s bin (18.21 %) [ -0.1%]
+BM_ZFlat/14 166908 166857 4375 218.6MB/s sum (51.88 %) [ -1.4%]
+BM_ZFlat/15 21181 20857 35000 193.3MB/s man (59.36 %) [ -0.8%]
+BM_ZFlat/16 244009 239973 2917 471.3MB/s pb (23.15 %) [ -1.4%]
+BM_ZFlat/17 596362 590000 1000 297.9MB/s gaviota (38.27%) [ +0.0%]
+
+R=sanjay
+
+------------------------------------------------------------------------
+r58 | snappy.mirrorbot@gmail.com | 2012-02-11 23:11:22 +0100 (Sat, 11 Feb 2012) | 9 lines
+
+Lower the size allocated in the "corrupted input" unit test from 256 MB
+to 2 MB. This fixes issues with running the unit test on platforms with
+little RAM (e.g. some ARM boards).
+
+Also, reactivate the 2 MB test for 64-bit platforms; there's no good
+reason why it shouldn't be.
+
+R=sanjay
+
+------------------------------------------------------------------------
+r57 | snappy.mirrorbot@gmail.com | 2012-01-08 18:55:48 +0100 (Sun, 08 Jan 2012) | 2 lines
+
+Minor refactoring to accomodate changes in Google's internal code tree.
+
+------------------------------------------------------------------------
+r56 | snappy.mirrorbot@gmail.com | 2012-01-04 14:10:46 +0100 (Wed, 04 Jan 2012) | 19 lines
+
+Fix public issue r57: Fix most warnings with -Wall, mostly signed/unsigned
+warnings. There are still some in the unit test, but the main .cc file should
+be clean. We haven't enabled -Wall for the default build, since the unit test
+is still not clean.
+
+This also fixes a real bug in the open-source implementation of
+ReadFileToStringOrDie(); it would not detect errors correctly.
+
+I had to go through some pains to avoid performance loss as the types
+were changed; I think there might still be some with 32-bit if and only if LFS
+is enabled (ie., size_t is 64-bit), but for regular 32-bit and 64-bit I can't
+see any losses, and I've diffed the generated GCC assembler between the old and
+new code without seeing any significant choices. If anything, it's ever so
+slightly faster.
+
+This may or may not enable compression of very large blocks (>2^32 bytes)
+when size_t is 64-bit, but I haven't checked, and it is still not a supported
+case.
+
+------------------------------------------------------------------------
+r55 | snappy.mirrorbot@gmail.com | 2012-01-04 11:46:39 +0100 (Wed, 04 Jan 2012) | 6 lines
+
+Add a framing format description. We do not have any implementation of this at
+the current point, but there seems to be enough of a general interest in the
+topic (cf. public bug #34).
+
+R=csilvers,sanjay
+
+------------------------------------------------------------------------
+r54 | snappy.mirrorbot@gmail.com | 2011-12-05 22:27:26 +0100 (Mon, 05 Dec 2011) | 81 lines
+
+Speed up decompression by moving the refill check to the end of the loop.
+
+This seems to work because in most of the branches, the compiler can evaluate
+“ip_limit_ - ip” in a more efficient way than reloading ip_limit_ from memory
+(either by already having the entire expression in a register, or reconstructing
+it from “avail”, or something else). Memory loads, even from L1, are seemingly
+costly in the big picture at the current decompression speeds.
+
+Microbenchmarks (64-bit, opt mode):
+
+Westmere (Intel Core i7):
+
+ Benchmark Time(ns) CPU(ns) Iterations
+ --------------------------------------------
+ BM_UFlat/0 74492 74491 187894 1.3GB/s html [ +5.9%]
+ BM_UFlat/1 712268 712263 19644 940.0MB/s urls [ +3.8%]
+ BM_UFlat/2 10591 10590 1000000 11.2GB/s jpg [ -6.8%]
+ BM_UFlat/3 29643 29643 469915 3.0GB/s pdf [ +7.9%]
+ BM_UFlat/4 304669 304667 45930 1.3GB/s html4 [ +4.8%]
+ BM_UFlat/5 28508 28507 490077 823.1MB/s cp [ +4.0%]
+ BM_UFlat/6 12415 12415 1000000 856.5MB/s c [ +8.6%]
+ BM_UFlat/7 3415 3415 4084723 1039.0MB/s lsp [+18.0%]
+ BM_UFlat/8 979569 979563 14261 1002.5MB/s xls [ +5.8%]
+ BM_UFlat/9 230150 230148 60934 630.2MB/s txt1 [ +5.2%]
+ BM_UFlat/10 197167 197166 71135 605.5MB/s txt2 [ +4.7%]
+ BM_UFlat/11 607394 607390 23041 670.1MB/s txt3 [ +5.6%]
+ BM_UFlat/12 808502 808496 17316 568.4MB/s txt4 [ +5.0%]
+ BM_UFlat/13 372791 372788 37564 1.3GB/s bin [ +3.3%]
+ BM_UFlat/14 44541 44541 313969 818.8MB/s sum [ +5.7%]
+ BM_UFlat/15 4833 4833 2898697 834.1MB/s man [ +4.8%]
+ BM_UFlat/16 79855 79855 175356 1.4GB/s pb [ +4.8%]
+ BM_UFlat/17 245845 245843 56838 715.0MB/s gaviota [ +5.8%]
+
+Clovertown (Intel Core 2):
+
+ Benchmark Time(ns) CPU(ns) Iterations
+ --------------------------------------------
+ BM_UFlat/0 107911 107890 100000 905.1MB/s html [ +2.2%]
+ BM_UFlat/1 1011237 1011041 10000 662.3MB/s urls [ +2.5%]
+ BM_UFlat/2 26775 26770 523089 4.4GB/s jpg [ +0.0%]
+ BM_UFlat/3 48103 48095 290618 1.8GB/s pdf [ +3.4%]
+ BM_UFlat/4 437724 437644 31937 892.6MB/s html4 [ +2.1%]
+ BM_UFlat/5 39607 39600 358284 592.5MB/s cp [ +2.4%]
+ BM_UFlat/6 18227 18224 768191 583.5MB/s c [ +2.7%]
+ BM_UFlat/7 5171 5170 2709437 686.4MB/s lsp [ +3.9%]
+ BM_UFlat/8 1560291 1559989 8970 629.5MB/s xls [ +3.6%]
+ BM_UFlat/9 335401 335343 41731 432.5MB/s txt1 [ +3.0%]
+ BM_UFlat/10 287014 286963 48758 416.0MB/s txt2 [ +2.8%]
+ BM_UFlat/11 888522 888356 15752 458.1MB/s txt3 [ +2.9%]
+ BM_UFlat/12 1186600 1186378 10000 387.3MB/s txt4 [ +3.1%]
+ BM_UFlat/13 572295 572188 24468 855.4MB/s bin [ +2.1%]
+ BM_UFlat/14 64060 64049 218401 569.4MB/s sum [ +4.1%]
+ BM_UFlat/15 7264 7263 1916168 555.0MB/s man [ +1.4%]
+ BM_UFlat/16 108853 108836 100000 1039.1MB/s pb [ +1.7%]
+ BM_UFlat/17 364289 364223 38419 482.6MB/s gaviota [ +4.9%]
+
+Barcelona (AMD Opteron):
+
+ Benchmark Time(ns) CPU(ns) Iterations
+ --------------------------------------------
+ BM_UFlat/0 103900 103871 100000 940.2MB/s html [ +8.3%]
+ BM_UFlat/1 1000435 1000107 10000 669.5MB/s urls [ +6.6%]
+ BM_UFlat/2 24659 24652 567362 4.8GB/s jpg [ +0.1%]
+ BM_UFlat/3 48206 48193 291121 1.8GB/s pdf [ +5.0%]
+ BM_UFlat/4 421980 421850 33174 926.0MB/s html4 [ +7.3%]
+ BM_UFlat/5 40368 40357 346994 581.4MB/s cp [ +8.7%]
+ BM_UFlat/6 19836 19830 708695 536.2MB/s c [ +8.0%]
+ BM_UFlat/7 6100 6098 2292774 581.9MB/s lsp [ +9.0%]
+ BM_UFlat/8 1693093 1692514 8261 580.2MB/s xls [ +8.0%]
+ BM_UFlat/9 365991 365886 38225 396.4MB/s txt1 [ +7.1%]
+ BM_UFlat/10 311330 311238 44950 383.6MB/s txt2 [ +7.6%]
+ BM_UFlat/11 975037 974737 14376 417.5MB/s txt3 [ +6.9%]
+ BM_UFlat/12 1303558 1303175 10000 352.6MB/s txt4 [ +7.3%]
+ BM_UFlat/13 517448 517290 27144 946.2MB/s bin [ +5.5%]
+ BM_UFlat/14 66537 66518 210352 548.3MB/s sum [ +7.5%]
+ BM_UFlat/15 7976 7974 1760383 505.6MB/s man [ +5.6%]
+ BM_UFlat/16 103121 103092 100000 1097.0MB/s pb [ +8.7%]
+ BM_UFlat/17 391431 391314 35733 449.2MB/s gaviota [ +6.5%]
+
+R=sanjay
+
+------------------------------------------------------------------------
+r53 | snappy.mirrorbot@gmail.com | 2011-11-23 12:14:17 +0100 (Wed, 23 Nov 2011) | 88 lines
+
+Speed up decompression by making the fast path for literals faster.
+
+We do the fast-path step as soon as possible; in fact, as soon as we know the
+literal length. Since we usually hit the fast path, we can then skip the checks
+for long literals and available input space (beyond what the fast path check
+already does).
+
+Note that this changes the decompression Writer API; however, it does not
+change the ABI, since writers are always templatized and as such never
+cross compilation units. The new API is slightly more general, in that it
+doesn't hard-code the value 16. Note that we also take care to check
+for len <= 16 first, since the other two checks almost always succeed
+(so we don't want to waste time checking for them until we have to).
+
+The improvements are most marked on Nehalem, but are generally positive
+on other platforms as well. All microbenchmarks are 64-bit, opt.
+
+Clovertown (Core 2):
+
+ Benchmark Time(ns) CPU(ns) Iterations
+ --------------------------------------------
+ BM_UFlat/0 110226 110224 100000 886.0MB/s html [ +1.5%]
+ BM_UFlat/1 1036523 1036508 10000 646.0MB/s urls [ -0.8%]
+ BM_UFlat/2 26775 26775 522570 4.4GB/s jpg [ +0.0%]
+ BM_UFlat/3 49738 49737 280974 1.8GB/s pdf [ +0.3%]
+ BM_UFlat/4 446790 446792 31334 874.3MB/s html4 [ +0.8%]
+ BM_UFlat/5 40561 40562 350424 578.5MB/s cp [ +1.3%]
+ BM_UFlat/6 18722 18722 746903 568.0MB/s c [ +1.4%]
+ BM_UFlat/7 5373 5373 2608632 660.5MB/s lsp [ +8.3%]
+ BM_UFlat/8 1615716 1615718 8670 607.8MB/s xls [ +2.0%]
+ BM_UFlat/9 345278 345281 40481 420.1MB/s txt1 [ +1.4%]
+ BM_UFlat/10 294855 294855 47452 404.9MB/s txt2 [ +1.6%]
+ BM_UFlat/11 914263 914263 15316 445.2MB/s txt3 [ +1.1%]
+ BM_UFlat/12 1222694 1222691 10000 375.8MB/s txt4 [ +1.4%]
+ BM_UFlat/13 584495 584489 23954 837.4MB/s bin [ -0.6%]
+ BM_UFlat/14 66662 66662 210123 547.1MB/s sum [ +1.2%]
+ BM_UFlat/15 7368 7368 1881856 547.1MB/s man [ +4.0%]
+ BM_UFlat/16 110727 110726 100000 1021.4MB/s pb [ +2.3%]
+ BM_UFlat/17 382138 382141 36616 460.0MB/s gaviota [ -0.7%]
+
+Westmere (Core i7):
+
+ Benchmark Time(ns) CPU(ns) Iterations
+ --------------------------------------------
+ BM_UFlat/0 78861 78853 177703 1.2GB/s html [ +2.1%]
+ BM_UFlat/1 739560 739491 18912 905.4MB/s urls [ +3.4%]
+ BM_UFlat/2 9867 9866 1419014 12.0GB/s jpg [ +3.4%]
+ BM_UFlat/3 31989 31986 438385 2.7GB/s pdf [ +0.2%]
+ BM_UFlat/4 319406 319380 43771 1.2GB/s html4 [ +1.9%]
+ BM_UFlat/5 29639 29636 472862 791.7MB/s cp [ +5.2%]
+ BM_UFlat/6 13478 13477 1000000 789.0MB/s c [ +2.3%]
+ BM_UFlat/7 4030 4029 3475364 880.7MB/s lsp [ +8.7%]
+ BM_UFlat/8 1036585 1036492 10000 947.5MB/s xls [ +6.9%]
+ BM_UFlat/9 242127 242105 57838 599.1MB/s txt1 [ +3.0%]
+ BM_UFlat/10 206499 206480 67595 578.2MB/s txt2 [ +3.4%]
+ BM_UFlat/11 641635 641570 21811 634.4MB/s txt3 [ +2.4%]
+ BM_UFlat/12 848847 848769 16443 541.4MB/s txt4 [ +3.1%]
+ BM_UFlat/13 384968 384938 36366 1.2GB/s bin [ +0.3%]
+ BM_UFlat/14 47106 47101 297770 774.3MB/s sum [ +4.4%]
+ BM_UFlat/15 5063 5063 2772202 796.2MB/s man [ +7.7%]
+ BM_UFlat/16 83663 83656 167697 1.3GB/s pb [ +1.8%]
+ BM_UFlat/17 260224 260198 53823 675.6MB/s gaviota [ -0.5%]
+
+Barcelona (Opteron):
+
+ Benchmark Time(ns) CPU(ns) Iterations
+ --------------------------------------------
+ BM_UFlat/0 112490 112457 100000 868.4MB/s html [ -0.4%]
+ BM_UFlat/1 1066719 1066339 10000 627.9MB/s urls [ +1.0%]
+ BM_UFlat/2 24679 24672 563802 4.8GB/s jpg [ +0.7%]
+ BM_UFlat/3 50603 50589 277285 1.7GB/s pdf [ +2.6%]
+ BM_UFlat/4 452982 452849 30900 862.6MB/s html4 [ -0.2%]
+ BM_UFlat/5 43860 43848 319554 535.1MB/s cp [ +1.2%]
+ BM_UFlat/6 21419 21413 653573 496.6MB/s c [ +1.0%]
+ BM_UFlat/7 6646 6645 2105405 534.1MB/s lsp [ +0.3%]
+ BM_UFlat/8 1828487 1827886 7658 537.3MB/s xls [ +2.6%]
+ BM_UFlat/9 391824 391714 35708 370.3MB/s txt1 [ +2.2%]
+ BM_UFlat/10 334913 334816 41885 356.6MB/s txt2 [ +1.7%]
+ BM_UFlat/11 1042062 1041674 10000 390.7MB/s txt3 [ +1.1%]
+ BM_UFlat/12 1398902 1398456 10000 328.6MB/s txt4 [ +1.7%]
+ BM_UFlat/13 545706 545530 25669 897.2MB/s bin [ -0.4%]
+ BM_UFlat/14 71512 71505 196035 510.0MB/s sum [ +1.4%]
+ BM_UFlat/15 8422 8421 1665036 478.7MB/s man [ +2.6%]
+ BM_UFlat/16 112053 112048 100000 1009.3MB/s pb [ -0.4%]
+ BM_UFlat/17 416723 416713 33612 421.8MB/s gaviota [ -2.0%]
+
+R=sanjay
+
+------------------------------------------------------------------------
+r52 | snappy.mirrorbot@gmail.com | 2011-11-08 15:46:39 +0100 (Tue, 08 Nov 2011) | 5 lines
+
+Fix public issue #53: Update the README to the API we actually open-sourced
+with.
+
+R=sanjay
+
+------------------------------------------------------------------------
+r51 | snappy.mirrorbot@gmail.com | 2011-10-05 14:27:12 +0200 (Wed, 05 Oct 2011) | 5 lines
+
+In the format description, use a clearer example to emphasize that varints are
+stored in little-endian. Patch from Christian von Roques.
+
+R=csilvers
+
+------------------------------------------------------------------------
+r50 | snappy.mirrorbot@gmail.com | 2011-09-15 21:34:06 +0200 (Thu, 15 Sep 2011) | 4 lines
+
+Release Snappy 1.0.4.
+
+R=sanjay
+
+------------------------------------------------------------------------
+r49 | snappy.mirrorbot@gmail.com | 2011-09-15 11:50:05 +0200 (Thu, 15 Sep 2011) | 5 lines
+
+Fix public issue #50: Include generic byteswap macros.
+Also include Solaris 10 and FreeBSD versions.
+
+R=csilvers
+
+------------------------------------------------------------------------
+r48 | snappy.mirrorbot@gmail.com | 2011-08-10 20:57:27 +0200 (Wed, 10 Aug 2011) | 5 lines
+
+Partially fix public issue 50: Remove an extra comma from the end of some
+enum declarations, as it seems the Sun compiler does not like it.
+
+Based on patch by Travis Vitek.
+
+------------------------------------------------------------------------
+r47 | snappy.mirrorbot@gmail.com | 2011-08-10 20:44:16 +0200 (Wed, 10 Aug 2011) | 4 lines
+
+Use the right #ifdef test for sys/mman.h.
+
+Based on patch by Travis Vitek.
+
+------------------------------------------------------------------------
+r46 | snappy.mirrorbot@gmail.com | 2011-08-10 03:22:09 +0200 (Wed, 10 Aug 2011) | 6 lines
+
+Fix public issue #47: Small comment cleanups in the unit test.
+
+Originally based on a patch by Patrick Pelletier.
+
+R=sanjay
+
+------------------------------------------------------------------------
+r45 | snappy.mirrorbot@gmail.com | 2011-08-10 03:14:43 +0200 (Wed, 10 Aug 2011) | 8 lines
+
+Fix public issue #46: Format description said "3-byte offset"
+instead of "4-byte offset" for the longest copies.
+
+Also fix an inconsistency in the heading for section 2.2.3.
+Both patches by Patrick Pelletier.
+
+R=csilvers
+
+------------------------------------------------------------------------
+r44 | snappy.mirrorbot@gmail.com | 2011-06-28 13:40:25 +0200 (Tue, 28 Jun 2011) | 8 lines
+
+Fix public issue #44: Make the definition and declaration of CompressFragment
+identical, even regarding cv-qualifiers.
+
+This is required to work around a bug in the Solaris Studio C++ compiler
+(it does not properly disregard cv-qualifiers when doing name mangling).
+
+R=sanjay
+
+------------------------------------------------------------------------
+r43 | snappy.mirrorbot@gmail.com | 2011-06-04 12:19:05 +0200 (Sat, 04 Jun 2011) | 7 lines
+
+Correct an inaccuracy in the Snappy format description.
+(I stumbled into this when changing the way we decompress literals.)
+
+R=csilvers
+
+Revision created by MOE tool push_codebase.
+
+------------------------------------------------------------------------
+r42 | snappy.mirrorbot@gmail.com | 2011-06-03 22:53:06 +0200 (Fri, 03 Jun 2011) | 50 lines
+
+Speed up decompression by removing a fast-path attempt.
+
+Whenever we try to enter a copy fast-path, there is a certain cost in checking
+that all the preconditions are in place, but it's normally offset by the fact
+that we can usually take the cheaper path. However, in a certain path we've
+already established that "avail < literal_length", which usually means that
+either the available space is small, or the literal is big. Both will disqualify
+us from taking the fast path, and thus we take the hit from the precondition
+checking without gaining much from having a fast path. Thus, simply don't try
+the fast path in this situation -- we're already on a slow path anyway
+(one where we need to refill more data from the reader).
+
+I'm a bit surprised at how much this gained; it could be that this path is
+more common than I thought, or that the simpler structure somehow makes the
+compiler happier. I haven't looked at the assembler, but it's a win across
+the board on both Core 2, Core i7 and Opteron, at least for the cases we
+typically care about. The gains seem to be the largest on Core i7, though.
+Results from my Core i7 workstation:
+
+
+ Benchmark Time(ns) CPU(ns) Iterations
+ ---------------------------------------------------
+ BM_UFlat/0 73337 73091 190996 1.3GB/s html [ +1.7%]
+ BM_UFlat/1 696379 693501 20173 965.5MB/s urls [ +2.7%]
+ BM_UFlat/2 9765 9734 1472135 12.1GB/s jpg [ +0.7%]
+ BM_UFlat/3 29720 29621 472973 3.0GB/s pdf [ +1.8%]
+ BM_UFlat/4 294636 293834 47782 1.3GB/s html4 [ +2.3%]
+ BM_UFlat/5 28399 28320 494700 828.5MB/s cp [ +3.5%]
+ BM_UFlat/6 12795 12760 1000000 833.3MB/s c [ +1.2%]
+ BM_UFlat/7 3984 3973 3526448 893.2MB/s lsp [ +5.7%]
+ BM_UFlat/8 991996 989322 14141 992.6MB/s xls [ +3.3%]
+ BM_UFlat/9 228620 227835 61404 636.6MB/s txt1 [ +4.0%]
+ BM_UFlat/10 197114 196494 72165 607.5MB/s txt2 [ +3.5%]
+ BM_UFlat/11 605240 603437 23217 674.4MB/s txt3 [ +3.7%]
+ BM_UFlat/12 804157 802016 17456 573.0MB/s txt4 [ +3.9%]
+ BM_UFlat/13 347860 346998 40346 1.4GB/s bin [ +1.2%]
+ BM_UFlat/14 44684 44559 315315 818.4MB/s sum [ +2.3%]
+ BM_UFlat/15 5120 5106 2739726 789.4MB/s man [ +3.3%]
+ BM_UFlat/16 76591 76355 183486 1.4GB/s pb [ +2.8%]
+ BM_UFlat/17 238564 237828 58824 739.1MB/s gaviota [ +1.6%]
+ BM_UValidate/0 42194 42060 333333 2.3GB/s html [ -0.1%]
+ BM_UValidate/1 433182 432005 32407 1.5GB/s urls [ -0.1%]
+ BM_UValidate/2 197 196 71428571 603.3GB/s jpg [ +0.5%]
+ BM_UValidate/3 14494 14462 972222 6.1GB/s pdf [ +0.5%]
+ BM_UValidate/4 168444 167836 83832 2.3GB/s html4 [ +0.1%]
+
+R=jeff
+
+Revision created by MOE tool push_codebase.
+
+------------------------------------------------------------------------
+r41 | snappy.mirrorbot@gmail.com | 2011-06-03 22:47:14 +0200 (Fri, 03 Jun 2011) | 43 lines
+
+Speed up decompression by not needing a lookup table for literal items.
+
+Looking up into and decoding the values from char_table has long shown up as a
+hotspot in the decompressor. While it turns out that it's hard to make a more
+efficient decoder for the copy ops, the literals are simple enough that we can
+decode them without needing a table lookup. (This means that 1/4 of the table
+is now unused, although that in itself doesn't buy us anything.)
+
+The gains are small, but definitely present; some tests win as much as 10%,
+but 1-4% is more typical. These results are from Core i7, in 64-bit mode;
+Core 2 and Opteron show similar results. (I've run with more iterations
+than unusual to make sure the smaller gains don't drown entirely in noise.)
+
+ Benchmark Time(ns) CPU(ns) Iterations
+ ---------------------------------------------------
+ BM_UFlat/0 74665 74428 182055 1.3GB/s html [ +3.1%]
+ BM_UFlat/1 714106 711997 19663 940.4MB/s urls [ +4.4%]
+ BM_UFlat/2 9820 9789 1427115 12.1GB/s jpg [ -1.2%]
+ BM_UFlat/3 30461 30380 465116 2.9GB/s pdf [ +0.8%]
+ BM_UFlat/4 301445 300568 46512 1.3GB/s html4 [ +2.2%]
+ BM_UFlat/5 29338 29263 479452 801.8MB/s cp [ +1.6%]
+ BM_UFlat/6 13004 12970 1000000 819.9MB/s c [ +2.1%]
+ BM_UFlat/7 4180 4168 3349282 851.4MB/s lsp [ +1.3%]
+ BM_UFlat/8 1026149 1024000 10000 959.0MB/s xls [+10.7%]
+ BM_UFlat/9 237441 236830 59072 612.4MB/s txt1 [ +0.3%]
+ BM_UFlat/10 203966 203298 69307 587.2MB/s txt2 [ +0.8%]
+ BM_UFlat/11 627230 625000 22400 651.2MB/s txt3 [ +0.7%]
+ BM_UFlat/12 836188 833979 16787 551.0MB/s txt4 [ +1.3%]
+ BM_UFlat/13 351904 350750 39886 1.4GB/s bin [ +3.8%]
+ BM_UFlat/14 45685 45562 308370 800.4MB/s sum [ +5.9%]
+ BM_UFlat/15 5286 5270 2656546 764.9MB/s man [ +1.5%]
+ BM_UFlat/16 78774 78544 178117 1.4GB/s pb [ +4.3%]
+ BM_UFlat/17 242270 241345 58091 728.3MB/s gaviota [ +1.2%]
+ BM_UValidate/0 42149 42000 333333 2.3GB/s html [ -3.0%]
+ BM_UValidate/1 432741 431303 32483 1.5GB/s urls [ +7.8%]
+ BM_UValidate/2 198 197 71428571 600.7GB/s jpg [+16.8%]
+ BM_UValidate/3 14560 14521 965517 6.1GB/s pdf [ -4.1%]
+ BM_UValidate/4 169065 168671 83832 2.3GB/s html4 [ -2.9%]
+
+R=jeff
+
+Revision created by MOE tool push_codebase.
+
+------------------------------------------------------------------------
+r40 | snappy.mirrorbot@gmail.com | 2011-06-03 00:57:41 +0200 (Fri, 03 Jun 2011) | 2 lines
+
+Release Snappy 1.0.3.
+
+------------------------------------------------------------------------
+r39 | snappy.mirrorbot@gmail.com | 2011-06-02 20:06:54 +0200 (Thu, 02 Jun 2011) | 11 lines
+
+Remove an unneeded goto in the decompressor; it turns out that the
+state of ip_ after decompression (or attempted decompresion) is
+completely irrelevant, so we don't need the trailer.
+
+Performance is, as expected, mostly flat -- there's a curious ~3-5%
+loss in the "lsp" test, but that test case is so short it is hard to say
+anything definitive about why (most likely, it's some sort of
+unrelated effect).
+
+R=jeff
+
+------------------------------------------------------------------------
+r38 | snappy.mirrorbot@gmail.com | 2011-06-02 19:59:40 +0200 (Thu, 02 Jun 2011) | 52 lines
+
+Speed up decompression by caching ip_.
+
+It is seemingly hard for the compiler to understand that ip_, the current input
+pointer into the compressed data stream, can not alias on anything else, and
+thus using it directly will incur memory traffic as it cannot be kept in a
+register. The code already knew about this and cached it into a local
+variable, but since Step() only decoded one tag, it had to move ip_ back into
+place between every tag. This seems to have cost us a significant amount of
+performance, so changing Step() into a function that decodes as much as it can
+before it saves ip_ back and returns. (Note that Step() was already inlined,
+so it is not the manual inlining that buys the performance here.)
+
+The wins are about 3-6% for Core 2, 6-13% on Core i7 and 5-12% on Opteron
+(for plain array-to-array decompression, in 64-bit opt mode).
+
+There is a tiny difference in the behavior here; if an invalid literal is
+encountered (ie., the writer refuses the Append() operation), ip_ will now
+point to the byte past the tag byte, instead of where the literal was
+originally thought to end. However, we don't use ip_ for anything after
+DecompressAllTags() has returned, so this should not change external behavior
+in any way.
+
+Microbenchmark results for Core i7, 64-bit (Opteron results are similar):
+
+Benchmark Time(ns) CPU(ns) Iterations
+---------------------------------------------------
+BM_UFlat/0 79134 79110 8835 1.2GB/s html [ +6.2%]
+BM_UFlat/1 786126 786096 891 851.8MB/s urls [+10.0%]
+BM_UFlat/2 9948 9948 69125 11.9GB/s jpg [ -1.3%]
+BM_UFlat/3 31999 31998 21898 2.7GB/s pdf [ +6.5%]
+BM_UFlat/4 318909 318829 2204 1.2GB/s html4 [ +6.5%]
+BM_UFlat/5 31384 31390 22363 747.5MB/s cp [ +9.2%]
+BM_UFlat/6 14037 14034 49858 757.7MB/s c [+10.6%]
+BM_UFlat/7 4612 4612 151395 769.5MB/s lsp [ +9.5%]
+BM_UFlat/8 1203174 1203007 582 816.3MB/s xls [+19.3%]
+BM_UFlat/9 253869 253955 2757 571.1MB/s txt1 [+11.4%]
+BM_UFlat/10 219292 219290 3194 544.4MB/s txt2 [+12.1%]
+BM_UFlat/11 672135 672131 1000 605.5MB/s txt3 [+11.2%]
+BM_UFlat/12 902512 902492 776 509.2MB/s txt4 [+12.5%]
+BM_UFlat/13 372110 371998 1881 1.3GB/s bin [ +5.8%]
+BM_UFlat/14 50407 50407 10000 723.5MB/s sum [+13.5%]
+BM_UFlat/15 5699 5701 100000 707.2MB/s man [+12.4%]
+BM_UFlat/16 83448 83424 8383 1.3GB/s pb [ +5.7%]
+BM_UFlat/17 256958 256963 2723 684.1MB/s gaviota [ +7.9%]
+BM_UValidate/0 42795 42796 16351 2.2GB/s html [+25.8%]
+BM_UValidate/1 490672 490622 1427 1.3GB/s urls [+22.7%]
+BM_UValidate/2 237 237 2950297 499.0GB/s jpg [+24.9%]
+BM_UValidate/3 14610 14611 47901 6.0GB/s pdf [+26.8%]
+BM_UValidate/4 171973 171990 4071 2.2GB/s html4 [+25.7%]
+
+
+
+------------------------------------------------------------------------
+r37 | snappy.mirrorbot@gmail.com | 2011-05-17 10:48:25 +0200 (Tue, 17 May 2011) | 10 lines
+
+
+Fix the numbering of the headlines in the Snappy format description.
+
+R=csilvers
+DELTA=4 (0 added, 0 deleted, 4 changed)
+
+
+Revision created by MOE tool push_codebase.
+MOE_MIGRATION=1906
+
+------------------------------------------------------------------------
+r36 | snappy.mirrorbot@gmail.com | 2011-05-16 10:59:18 +0200 (Mon, 16 May 2011) | 12 lines
+
+
+Fix public issue #32: Add compressed format documentation for Snappy.
+This text is new, but an earlier version from Zeev Tarantov was used
+as reference.
+
+R=csilvers
+DELTA=112 (111 added, 0 deleted, 1 changed)
+
+
+Revision created by MOE tool push_codebase.
+MOE_MIGRATION=1867
+
+------------------------------------------------------------------------
+r35 | snappy.mirrorbot@gmail.com | 2011-05-09 23:29:02 +0200 (Mon, 09 May 2011) | 12 lines
+
+
+Fix public issue #39: Pick out the median runs based on CPU time,
+not real time. Also, use nth_element instead of sort, since we
+only need one element.
+
+R=csilvers
+DELTA=5 (3 added, 0 deleted, 2 changed)
+
+
+Revision created by MOE tool push_codebase.
+MOE_MIGRATION=1799
+
+------------------------------------------------------
<TRUNCATED>