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Posted to users@subversion.apache.org by Rick Yorgason <ri...@ldagames.com> on 2007/03/21 22:53:58 UTC
Very large rev files
I have another performance issue with our Subversion repository
(although if anybody would like to take a look at my existing issue
<http://subversion.tigris.org/servlets/ReadMsg?list=users&msgNo=63804>
it would be appreciated).
The problem now is that many of my rev files are much bigger than I
assume they should be. I've taken a sample file from my real-world
repository and imported a few revisions into a clean repository to
showcase the issue. Check it out:
> skorpion@katrina:<<svntest/repo/db/revs$> ls -lh
> total 71026
> -rw-r--r-- 1 skorpion skorpion 115B 20 Mar 22:52 0
> -rw-r--r-- 1 skorpion skorpion 25M 21 Mar 02:40 1
> -rw-r--r-- 1 skorpion skorpion 22M 21 Mar 02:55 2
> -rw-r--r-- 1 skorpion skorpion 22M 21 Mar 03:10 3
> skorpion@katrina:<<svntest/repo/db/revs$> cd ../../..
> skorpion@katrina:~/code/sandbox/svntest$> svn co file:///home/skorpion/code/sandbox/svntest/repo/co@1 1
> A 1/Greece_Full.map
> Checked out revision 1.
> skorpion@katrina:~/code/sandbox/svntest$> svn co file:///home/skorpion/code/sandbox/svntest/repo/co@2 2
> A 2/Greece_Full.map
> Checked out revision 2.
> skorpion@katrina:~/code/sandbox/svntest$> svn co file:///home/skorpion/code/sandbox/svntest/repo/co@3 3
> A 3/Greece_Full.map
> Checked out revision 3.
> skorpion@katrina:~/code/sandbox/svntest$> ls -lh 1 2 3
> 1:
> total 56512
> -rw-r--r-- 1 skorpion skorpion 55M 21 Mar 17:24 Greece_Full.map
>
> 2:
> total 56512
> -rw-r--r-- 1 skorpion skorpion 55M 21 Mar 18:02 Greece_Full.map
>
> 3:
> total 56512
> -rw-r--r-- 1 skorpion skorpion 55M 21 Mar 18:05 Greece_Full.map
> skorpion@katrina:~/code/sandbox/svntest$> xdelta delta 1/Greece_Full.map 2/Greece_Full.map 1to2.diff
> skorpion@katrina:~/code/sandbox/svntest$> xdelta delta 2/Greece_Full.map 3/Greece_Full.map 2to3.diff
> skorpion@katrina:~/code/sandbox/svntest$> ls -lh 1to2.diff 2to3.diff
> -rw-r--r-- 1 skorpion skorpion 25K 21 Mar 18:18 1to2.diff
> -rw-r--r-- 1 skorpion skorpion 25K 21 Mar 18:20 2to3.diff
As you can see, the rev file is *one thousand* times bigger than the
delta that the xdelta utility produces.
Greece_Full.map doesn't have any sort of compression on it. It's mostly
a giant bitmap with a lot of header information, that changes in size
with each revision.
Anybody know what's going on?
-Rick-
This was tested on FreeBSD with svn 1.4.3 and xdelta 1.1.3, although the
issue was originally tested with svn 1.4.0 on Windows 2000 via Apache
with the Windows version of xdelta 1.1.3.
Anybody know what's going on?
-Rick-
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Re: Very large rev files
Posted by Rick Yorgason <ri...@ldagames.com>.
Rick Yorgason wrote:
> Here's my results:
>
>> Rev# Raw db/revs Xdelta3 -0 Xdelta3 Xdelta3 -9 Xdelta
>> Total 5.1G 2.0G 4M 3M 2M 3M
>
> That's a little difficult to swallow.
Just wanted to let anybody who's paying attention to the thread (or
found it via Google in hopes that it would solve their problem) know
that the discrepancy has been tracked down (thanks in no small part to
the devs):
<http://subversion.tigris.org/servlets/ReadMsg?list=dev&msgNo=125518>.
Unfortunately there's no real fix without enhancing Subversion. Ah well.
-Rick-
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Re: Very large rev files
Posted by Rick Yorgason <ri...@ldagames.com>.
Roy Franz wrote:
> Rick - you should try using xdelta with the -0 option, as this
> prevents zlib compression of the output. Since your data sets sound
> very compressible, this could be part of what is making xdelta produce
> much smaller results.
Good call. I've done some more experiments, this time with 93 revisions
of my test file in a test repository using xdelta3
<http://www.xdelta.org/> and xdelta
<http://evanjones.ca/software/xdelta-win32.html>. There's no -0 test
for xdelta, because it seems the Windows port ignores the compression
flag and always uses the default. I also didn't want to test this on my
FreeBSD machine (which has a working implementation of xdelta), because
it's slow and all the way across the Internet.
Here's my results:
> Rev# Raw db/revs Xdelta3 -0 Xdelta3 Xdelta3 -9 Xdelta
> 0 115
> 1 55M 26M
> 2 55M 23M 501K 445K 378K 327K
> 3 55M 23M 129K 120K 100K 100K
> 4 55M 23M 89K 76K 56K 82K
> 5 55M 23M 23K 21K 16K 29K
> 6 55M 22M 47K 44K 28K 50K
> 7 55M 22M 13K 13K 11K 19K
> 8 55M 22M 11K 11K 8.8K 19K
> 9 55M 23M 20K 19K 8.7K 17K
> 10 55M 22M 9.1K 9.4K 8.0K 19K
> 11 55M 22M 14K 14K 13K 22K
> 12 55M 23M 44K 43K 41K 46K
> 13 55M 23M 16K 16K 14K 23K
> 14 55M 22M 38K 37K 33K 39K
> 15 55M 22M 18K 14K 11K 22K
> 16 55M 23M 43K 43K 39K 43K
> 17 55M 23M 21K 20K 18K 26K
> 18 55M 23M 89K 89K 83K 82K
> 19 55M 23M 16K 17K 8.5K 18K
> 20 55M 26K 862 765 721 823
> 21 55M 23M 14K 14K 11K 21K
> 22 55M 22M 24K 24K 20K 38K
> 23 55M 22M 22K 20K 16K 27K
> 24 55M 22M 16K 16K 13K 21K
> 25 55M 23M 15K 15K 13K 21K
> 26 55M 22M 37K 38K 22K 39K
> 27 55M 22M 12K 12K 8.3K 18K
> 28 55M 22M 13K 13K 9.0K 19K
> 29 55M 22M 18K 18K 17K 26K
> 30 55M 489K 12K 9.7K 8.4K 9.0K
> 31 55M 22M 18K 17K 14K 25K
> 32 55M 22M 27K 27K 18K 32K
> 33 55M 23M 22K 19K 17K 29K
> 34 55M 22M 19K 18K 16K 26K
> 35 55M 22M 19K 17K 12K 22K
> 36 55M 22M 12K 12K 9.1K 20K
> 37 55M 22M 18K 17K 15K 25K
> 38 55M 22M 18K 17K 14K 23K
> 39 55M 22M 29K 23K 18K 28K
> 40 55M 22M 14K 13K 11K 22K
> 41 55M 23M 26K 23K 15K 24K
> 42 55M 22M 16K 16K 9.8K 21K
> 43 55M 22M 15K 14K 11K 20K
> 44 55M 22M 24K 21K 17K 27K
> 45 55M 22M 30K 26K 21K 37K
> 46 55M 22M 49K 47K 25K 43K
> 47 55M 22M 27K 24K 19K 29K
> 48 55M 22M 34K 33K 28K 43K
> 49 55M 23M 19K 18K 14K 23K
> 50 55M 22M 14K 13K 11K 21K
> 51 55M 22M 13K 13K 8.9K 18K
> 52 55M 22M 16K 15K 12K 22K
> 53 55M 22M 18K 17K 15K 24K
> 54 55M 22M 20K 18K 14K 25K
> 55 55M 22M 21K 19K 13K 23K
> 56 56M 22M 24K 21K 18K 29K
> 57 56M 23M 28K 26K 21K 31K
> 58 56M 22M 25K 24K 16K 29K
> 59 56M 23M 53K 49K 44K 54K
> 60 56M 22M 35K 34K 30K 40K
> 61 56M 23M 30K 29K 26K 35K
> 62 56M 22M 19K 18K 14K 24K
> 63 56M 22M 16K 16K 13K 25K
> 64 56M 22M 17K 15K 12K 22K
> 65 56M 23M 14K 14K 11K 22K
> 66 56M 22M 14K 14K 8.9K 20K
> 67 56M 22M 17K 16K 10K 19K
> 68 56M 22M 17K 17K 14K 24K
> 69 56M 22M 15K 15K 12K 22K
> 70 56M 22M 13K 12K 9.3K 20K
> 71 56M 22M 25K 21K 11K 22K
> 72 56M 22M 20K 18K 13K 26K
> 73 56M 22M 15K 16K 11K 24K
> 74 56M 22M 28K 28K 20K 34K
> 75 56M 22M 31K 30K 23K 33K
> 76 56M 23M 81K 78K 72K 76K
> 77 56M 23M 36K 35K 32K 42K
> 78 56M 22M 42K 41K 30K 38K
> 79 56M 23M 27K 26K 19K 31K
> 80 56M 22M 19K 18K 12K 25K
> 81 56M 23M 16K 16K 12K 25K
> 82 56M 22M 21K 19K 15K 25K
> 83 56M 22M 51K 47K 17K 29K
> 84 56M 22M 44K 44K 23K 45K
> 85 56M 22M 43K 39K 14K 25K
> 86 56M 22M 17K 16K 13K 23K
> 87 56M 22M 14K 14K 11K 18K
> 88 56M 22M 16K 18K 9.7K 20K
> 89 56M 23M 99K 91K 56K 82K
> 90 56M 22M 44K 39K 29K 46K
> 91 56M 22M 134K 36K 26K 48K
> 92 56M 22M 23K 22K 16K 29K
> 93 56M 23M 214K 174K 131K 151K
> 94 56M 23M 579K 125K 92K 142K
>
> Total 5.1G 2.0G 4M 3M 2M 3M
That's a little difficult to swallow.
Maybe when I get some time I'll do another test with some long Wikipedia
page and an svn nightly.
-Rick-
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Re: Very large rev files
Posted by Roy Franz <ro...@gmail.com>.
On 3/21/07, Rick Yorgason <ri...@ldagames.com> wrote:
> Ryan Schmidt wrote:
> > I assume this is because Subversion does not necessarily delta against
> > the immediately previous revision. See this document describing
> > "skip-deltas":
> >
> > http://svn.collab.net/repos/svn/trunk/notes/skip-deltas
>
> Okay, but wouldn't that imply that at least *some* of the revs would
> have ideal file sizes?
>
> Here's the sizes of all the revs that this file this file touches in a
> real-world repository. In most of these cases, (*all* of the cases that
> are 37/38M) the commit contains this 55M file, with 20 files that are 1M
> big, and no other files.
>
> Because of the data set these extra 20 files should also delta compress
> exceedingly well (they're 512x512 uncompressed R8G8B8A8 images,
> containing greyscale data which is mostly white, and completely white
> for the last two thirds of the file, in every revision). However, even
> if you subtract 20M from each of these revisions, almost all of them are
> still much larger than the ideal size.
>
> By the explanation provided in the notes on skip-deltas, you would
> expect there to be a wide variety of file sizes that are logarithmically
> smaller, with every odd-numbered one being ideal (with a delta that's
> less than 1M), but you clearly don't see that.
>
> The few that are closer to ideal are r2011, r2091, and r2143. If it
> matters at all, these three revisions happened when we still used
> svnserve instead of Apache (those are all dated 'Nov 1' because I dumped
> and reloaded the repository for some reason or other). All the other
> small revs are lazy copies.
>
> For interest case, revs 1 2 and 3 in my last email were created from
> revs 5682 5691 and 5700 in the real-world repository.
>
> > Administrator@bender /cygdrive/e/Server/SVN/db/revs
> > $ ls -lh `svn log -q file:///e:/Server/SVN/Hegemony/trunk/Release/Resources/Data/Greece_Full.map | grep -v '^-' | sed 's/r\([0-9]*\).*/\1/' | tr '\n' ' '`
> > -rwxrwxrwx 1 Administrators None 207M Nov 1 14:51 105
> > -rwxrwxrwx 1 Administrators None 3.6K Nov 1 14:51 1698
> > -rwxrwxrwx 1 Administrators None 37M Nov 1 14:52 1766
> > -rwxrwxrwx 1 Administrators None 40M Nov 1 14:53 1774
> > -rwxrwxrwx 1 Administrators None 37M Nov 1 14:53 1776
snipped....
I just did some experiments along these lines to see how well the
xdelta compression works for large files. (We have some large binary
files, and we want
to know what the impact on the repository size would be if we check them in.)
In general, it seemed to do an OK job, but I also see the xdelta program doing
a much better job. I was using a test repository, and adding the
file, then checking in
one (or more) updates so that I could easily tell what revision in
subversion the delta should be based upon. The first update will
always be a delta from the original
checkin if I understand the skip-delta documentation correctly.
For one of the files, xdelta -0 -p produced a 7 Mbyte delta file, while the
subversion revision was 27 Mbytes. Other revisions that I checked had
sizes that were 2-3 times as big as the xdelta output.
Rick - you should try using xdelta with the -0 option, as this
prevents zlib compression of the output. Since your data sets sound
very compressible, this could be part of what is making xdelta produce
much smaller results.
Since my test data was a big tar file, I also found that the -p option
(makes xdelta not peek inside gzip compressed data) made my deltas
much bigger. (I am comparing the subversion revision size to the
worst case output from the xdelta program.)
I also tried a few experiments with gzipped files, and found that gzip
with the --rsyncable flag did better than uncompressed by a small
margin, and that normal gzipping did much worse.
It looks like there may be (significant) room for improvement in the
binary delta handling in subversion. Do any lurking developers know
what xdelta and subersion might be doing differently?
Roy
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Re: Very large rev files
Posted by Rick Yorgason <ri...@ldagames.com>.
Ryan Schmidt wrote:
> I assume this is because Subversion does not necessarily delta against
> the immediately previous revision. See this document describing
> "skip-deltas":
>
> http://svn.collab.net/repos/svn/trunk/notes/skip-deltas
Okay, but wouldn't that imply that at least *some* of the revs would
have ideal file sizes?
Here's the sizes of all the revs that this file this file touches in a
real-world repository. In most of these cases, (*all* of the cases that
are 37/38M) the commit contains this 55M file, with 20 files that are 1M
big, and no other files.
Because of the data set these extra 20 files should also delta compress
exceedingly well (they're 512x512 uncompressed R8G8B8A8 images,
containing greyscale data which is mostly white, and completely white
for the last two thirds of the file, in every revision). However, even
if you subtract 20M from each of these revisions, almost all of them are
still much larger than the ideal size.
By the explanation provided in the notes on skip-deltas, you would
expect there to be a wide variety of file sizes that are logarithmically
smaller, with every odd-numbered one being ideal (with a delta that's
less than 1M), but you clearly don't see that.
The few that are closer to ideal are r2011, r2091, and r2143. If it
matters at all, these three revisions happened when we still used
svnserve instead of Apache (those are all dated 'Nov 1' because I dumped
and reloaded the repository for some reason or other). All the other
small revs are lazy copies.
For interest case, revs 1 2 and 3 in my last email were created from
revs 5682 5691 and 5700 in the real-world repository.
> Administrator@bender /cygdrive/e/Server/SVN/db/revs
> $ ls -lh `svn log -q file:///e:/Server/SVN/Hegemony/trunk/Release/Resources/Data/Greece_Full.map | grep -v '^-' | sed 's/r\([0-9]*\).*/\1/' | tr '\n' ' '`
> -rwxrwxrwx 1 Administrators None 207M Nov 1 14:51 105
> -rwxrwxrwx 1 Administrators None 3.6K Nov 1 14:51 1698
> -rwxrwxrwx 1 Administrators None 37M Nov 1 14:52 1766
> -rwxrwxrwx 1 Administrators None 40M Nov 1 14:53 1774
> -rwxrwxrwx 1 Administrators None 37M Nov 1 14:53 1776
> -rwxrwxrwx 1 Administrators None 41M Nov 1 14:53 1782
> -rwxrwxrwx 1 Administrators None 40M Nov 1 14:54 1783
> -rwxrwxrwx 1 Administrators None 37M Nov 1 14:54 1784
> -rwxrwxrwx 1 Administrators None 42M Nov 1 14:54 1791
> -rwxrwxrwx 1 Administrators None 37M Nov 1 14:54 1802
> -rwxrwxrwx 1 Administrators None 39M Nov 1 14:54 1808
> -rwxrwxrwx 1 Administrators None 39M Nov 1 14:54 1809
> -rwxrwxrwx 1 Administrators None 42M Nov 1 14:55 1820
> -rwxrwxrwx 1 Administrators None 37M Nov 1 14:55 1826
> -rwxrwxrwx 1 Administrators None 37M Nov 1 14:55 1830
> -rwxrwxrwx 1 Administrators None 37M Nov 1 14:57 1872
> -rwxrwxrwx 1 Administrators None 37M Nov 1 14:57 1874
> -rwxrwxrwx 1 Administrators None 40M Nov 1 14:57 1876
> -rwxrwxrwx 1 Administrators None 37M Nov 1 14:58 1898
> -rwxrwxrwx 1 Administrators None 40M Nov 1 14:58 1899
> -rwxrwxrwx 1 Administrators None 40M Nov 1 14:59 1906
> -rwxrwxrwx 1 Administrators None 38M Nov 1 14:59 1907
> -rwxrwxrwx 1 Administrators None 37M Nov 1 14:59 1911
> -rwxrwxrwx 1 Administrators None 37M Nov 1 14:59 1919
> -rwxrwxrwx 1 Administrators None 40M Nov 1 15:00 1966
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:00 1968
> -rwxrwxrwx 1 Administrators None 40M Nov 1 15:14 1970
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:00 1973
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:01 1979
> -rwxrwxrwx 1 Administrators None 40M Nov 1 15:01 1986
> -rwxrwxrwx 1 Administrators None 39M Nov 1 15:01 1987
> -rwxrwxrwx 1 Administrators None 41M Nov 1 15:01 1988
> -rwxrwxrwx 1 Administrators None 40M Nov 1 15:02 1989
> -rwxrwxrwx 1 Administrators None 41M Nov 1 15:04 2003
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:04 2010
> -rwxrwxrwx 1 Administrators None 117K Nov 1 15:04 2011
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:05 2012
> -rwxrwxrwx 1 Administrators None 39M Nov 1 15:05 2013
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:05 2014
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:05 2015
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:06 2016
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:06 2028
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:06 2029
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:06 2030
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:07 2032
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:07 2038
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:07 2042
> -rwxrwxrwx 1 Administrators None 39M Nov 1 15:07 2051
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:08 2052
> -rwxrwxrwx 1 Administrators None 38M Nov 1 15:08 2055
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:08 2056
> -rwxrwxrwx 1 Administrators None 41M Nov 1 15:08 2062
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:09 2067
> -rwxrwxrwx 1 Administrators None 38M Nov 1 15:09 2071
> -rwxrwxrwx 1 Administrators None 39M Nov 1 15:09 2075
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:10 2082
> -rwxrwxrwx 1 Administrators None 39M Nov 1 15:10 2088
> -rwxrwxrwx 1 Administrators None 1.5M Nov 1 15:10 2091
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:12 2110
> -rwxrwxrwx 1 Administrators None 38M Nov 1 15:12 2116
> -rwxrwxrwx 1 Administrators None 38M Nov 1 15:12 2123
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:13 2125
> -rwxrwxrwx 1 Administrators None 39M Nov 1 15:13 2126
> -rwxrwxrwx 1 Administrators None 38M Nov 1 15:13 2128
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:14 2129
> -rwxrwxrwx 1 Administrators None 701K Nov 1 15:14 2143
> -rwxrwxrwx 1 Administrators None 41M Nov 1 15:14 2161
> -rwxrwxrwx 1 Administrators None 39M Nov 1 15:15 2162
> -rwxrwxrwx 1 Administrators None 38M Nov 1 15:15 2165
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:15 2166
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:16 2168
> -rwxrwxrwx 1 Administrators None 42M Nov 1 15:16 2172
> -rwxrwxrwx 1 Administrators None 41M Nov 1 15:16 2173
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:16 2174
> -rwxrwxrwx 1 Administrators None 39M Nov 1 15:16 2175
> -rwxrwxrwx 1 Administrators None 38M Nov 1 15:17 2178
> -rwxrwxrwx 1 Administrators None 42M Nov 1 15:17 2179
> -rwxrwxrwx 1 Administrators None 40M Nov 1 15:17 2180
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:18 2181
> -rwxrwxrwx 1 Administrators None 39M Nov 1 15:18 2207
> -rwxrwxrwx 1 Administrators None 40M Nov 1 15:18 2208
> -rwxrwxrwx 1 Administrators None 38M Nov 1 15:18 2215
> -rwxrwxrwx 1 Administrators None 38M Nov 1 15:19 2219
> -rwxrwxrwx 1 Administrators None 38M Nov 1 15:19 2220
> -rwxrwxrwx 1 Administrators None 38M Nov 1 15:19 2224
> -rwxrwxrwx 1 Administrators None 38M Nov 1 15:19 2225
> -rwxrwxrwx 1 Administrators None 39M Nov 1 15:19 2226
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:34 2263
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:34 2269
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:34 2272
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:34 2274
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:34 2283
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:35 2284
> -rwxrwxrwx 1 Administrators None 73M Nov 1 15:36 2289
> -rwxrwxrwx 1 Administrators None 39M Nov 1 15:36 2295
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:36 2298
> -rwxrwxrwx 1 Administrators None 38M Nov 1 15:37 2304
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:37 2317
> -rwxrwxrwx 1 Administrators None 38M Nov 1 15:37 2341
> -rwxrwxrwx 1 Administrators None 39M Nov 1 15:38 2348
> -rwxrwxrwx 1 Administrators None 49M Nov 1 15:38 2376
> -rwxrwxrwx 1 Administrators None 46M Nov 1 15:41 2397
> -rwxrwxrwx 1 Administrators None 48M Nov 1 15:42 2407
> -rwxrwxrwx 1 Administrators None 38M Nov 1 15:20 2411
> -rwxrwxrwx 1 Administrators None 38M Nov 1 15:20 2418
> -rwxrwxrwx 1 Administrators None 97M Nov 1 15:21 2422
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:21 2423
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:21 2426
> -rwxrwxrwx 1 Administrators None 39M Nov 1 15:43 2435
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:43 2440
> -rwxrwxrwx 1 Administrators None 39M Nov 1 15:43 2443
> -rwxrwxrwx 1 Administrators None 39M Nov 1 15:44 2447
> -rwxrwxrwx 1 Administrators None 39M Nov 1 15:44 2449
> -rwxrwxrwx 1 Administrators None 40M Nov 1 15:44 2450
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:45 2463
> -rwxrwxrwx 1 Administrators None 38M Nov 1 15:45 2471
> -rwxrwxrwx 1 Administrators None 38M Nov 1 15:45 2472
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:46 2476
> -rwxrwxrwx 1 Administrators None 40M Nov 1 15:46 2481
> -rwxrwxrwx 1 Administrators None 41M Nov 1 15:46 2488
> -rwxrwxrwx 1 Administrators None 40M Nov 1 15:46 2489
> -rwxrwxrwx 1 Administrators None 41M Nov 1 15:47 2494
> -rwxrwxrwx 1 Administrators None 39M Nov 1 15:47 2495
> -rwxrwxrwx 1 Administrators None 42M Nov 1 15:47 2496
> -rwxrwxrwx 1 Administrators None 40M Nov 1 15:48 2503
> -rwxrwxrwx 1 Administrators None 38M Nov 1 15:33 2505
> -rwxrwxrwx 1 Administrators None 38M Nov 1 15:48 2514
> -rwxrwxrwx 1 Administrators None 40M Nov 1 15:48 2520
> -rwxrwxrwx 1 Administrators None 38M Nov 1 15:33 2524
> -rwxrwxrwx 1 Administrators None 37M Nov 1 15:49 2531
> -rwxrwxrwx 1 Administrators None 38M Nov 1 15:49 2537
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-Rick-
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Re: Very large rev files
Posted by Ryan Schmidt <su...@ryandesign.com>.
On Mar 21, 2007, at 17:53, Rick Yorgason wrote:
> I have another performance issue with our Subversion repository
> (although if anybody would like to take a look at my existing issue
> <http://subversion.tigris.org/servlets/ReadMsg?
> list=users&msgNo=63804> it would be appreciated).
>
> The problem now is that many of my rev files are much bigger than I
> assume they should be. I've taken a sample file from my real-world
> repository and imported a few revisions into a clean repository to
> showcase the issue. Check it out:
[snip]
> As you can see, the rev file is *one thousand* times bigger than
> the delta that the xdelta utility produces.
[snip]
I assume this is because Subversion does not necessarily delta
against the immediately previous revision. See this document
describing "skip-deltas":
http://svn.collab.net/repos/svn/trunk/notes/skip-deltas
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