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Posted to commits@quickstep.apache.org by zu...@apache.org on 2017/01/29 02:07:52 UTC
[18/52] [partial] incubator-quickstep git commit: Make the third
party directory leaner.
http://git-wip-us.apache.org/repos/asf/incubator-quickstep/blob/9661f956/third_party/gperftools/doc/t-test1.times.txt
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diff --git a/third_party/gperftools/doc/t-test1.times.txt b/third_party/gperftools/doc/t-test1.times.txt
deleted file mode 100644
index 0163693..0000000
--- a/third_party/gperftools/doc/t-test1.times.txt
+++ /dev/null
@@ -1,480 +0,0 @@
-time.1.ptmalloc.64:0.56 user 0.02 system 0.57 elapsed 100% CPU
-time.1.tcmalloc.64:0.38 user 0.02 system 0.40 elapsed 98% CPU
-time.1.ptmalloc.128:0.61 user 0.01 system 0.61 elapsed 101% CPU
-time.1.tcmalloc.128:0.35 user 0.00 system 0.35 elapsed 99% CPU
-time.1.ptmalloc.256:0.59 user 0.01 system 0.60 elapsed 100% CPU
-time.1.tcmalloc.256:0.27 user 0.02 system 0.28 elapsed 102% CPU
-time.1.ptmalloc.512:0.57 user 0.00 system 0.57 elapsed 100% CPU
-time.1.tcmalloc.512:0.25 user 0.01 system 0.25 elapsed 101% CPU
-time.1.ptmalloc.1024:0.52 user 0.00 system 0.52 elapsed 99% CPU
-time.1.tcmalloc.1024:0.22 user 0.02 system 0.24 elapsed 97% CPU
-time.1.ptmalloc.2048:0.47 user 0.00 system 0.47 elapsed 99% CPU
-time.1.tcmalloc.2048:0.22 user 0.02 system 0.25 elapsed 95% CPU
-time.1.ptmalloc.4096:0.48 user 0.01 system 0.48 elapsed 100% CPU
-time.1.tcmalloc.4096:0.25 user 0.01 system 0.25 elapsed 100% CPU
-time.1.ptmalloc.8192:0.49 user 0.02 system 0.49 elapsed 102% CPU
-time.1.tcmalloc.8192:0.27 user 0.02 system 0.28 elapsed 101% CPU
-time.1.ptmalloc.16384:0.51 user 0.04 system 0.55 elapsed 99% CPU
-time.1.tcmalloc.16384:0.35 user 0.02 system 0.37 elapsed 100% CPU
-time.1.ptmalloc.32768:0.53 user 0.14 system 0.66 elapsed 100% CPU
-time.1.tcmalloc.32768:0.67 user 0.02 system 0.69 elapsed 99% CPU
-time.1.ptmalloc.65536:0.68 user 0.31 system 0.98 elapsed 100% CPU
-time.1.tcmalloc.65536:0.71 user 0.01 system 0.72 elapsed 99% CPU
-time.1.ptmalloc.131072:0.90 user 0.72 system 1.62 elapsed 99% CPU
-time.1.tcmalloc.131072:0.94 user 0.03 system 0.97 elapsed 99% CPU
-time.2.ptmalloc.64:1.05 user 0.00 system 0.53 elapsed 196% CPU
-time.2.tcmalloc.64:0.66 user 0.03 system 0.37 elapsed 185% CPU
-time.2.ptmalloc.128:1.77 user 0.01 system 0.89 elapsed 198% CPU
-time.2.tcmalloc.128:0.53 user 0.01 system 0.29 elapsed 184% CPU
-time.2.ptmalloc.256:1.14 user 0.01 system 0.62 elapsed 182% CPU
-time.2.tcmalloc.256:0.45 user 0.02 system 0.26 elapsed 180% CPU
-time.2.ptmalloc.512:1.26 user 0.40 system 1.79 elapsed 92% CPU
-time.2.tcmalloc.512:0.43 user 0.02 system 0.27 elapsed 166% CPU
-time.2.ptmalloc.1024:0.98 user 0.03 system 0.56 elapsed 179% CPU
-time.2.tcmalloc.1024:0.44 user 0.02 system 0.34 elapsed 134% CPU
-time.2.ptmalloc.2048:0.87 user 0.02 system 0.44 elapsed 199% CPU
-time.2.tcmalloc.2048:0.49 user 0.02 system 0.34 elapsed 148% CPU
-time.2.ptmalloc.4096:0.92 user 0.03 system 0.48 elapsed 196% CPU
-time.2.tcmalloc.4096:0.50 user 0.02 system 0.49 elapsed 105% CPU
-time.2.ptmalloc.8192:1.05 user 0.04 system 0.55 elapsed 196% CPU
-time.2.tcmalloc.8192:0.59 user 0.01 system 0.51 elapsed 116% CPU
-time.2.ptmalloc.16384:1.30 user 0.14 system 0.72 elapsed 198% CPU
-time.2.tcmalloc.16384:0.63 user 0.03 system 0.68 elapsed 96% CPU
-time.2.ptmalloc.32768:1.33 user 0.56 system 1.00 elapsed 189% CPU
-time.2.tcmalloc.32768:1.16 user 0.01 system 1.17 elapsed 99% CPU
-time.2.ptmalloc.65536:1.86 user 1.79 system 2.01 elapsed 181% CPU
-time.2.tcmalloc.65536:1.35 user 0.01 system 1.35 elapsed 100% CPU
-time.2.ptmalloc.131072:2.61 user 5.19 system 4.81 elapsed 162% CPU
-time.2.tcmalloc.131072:1.86 user 0.04 system 1.90 elapsed 100% CPU
-time.3.ptmalloc.64:1.79 user 0.03 system 0.67 elapsed 268% CPU
-time.3.tcmalloc.64:1.58 user 0.04 system 0.62 elapsed 260% CPU
-time.3.ptmalloc.128:2.77 user 1.34 system 3.07 elapsed 133% CPU
-time.3.tcmalloc.128:1.19 user 0.01 system 0.50 elapsed 236% CPU
-time.3.ptmalloc.256:2.14 user 0.02 system 0.85 elapsed 252% CPU
-time.3.tcmalloc.256:0.96 user 0.01 system 0.41 elapsed 236% CPU
-time.3.ptmalloc.512:3.37 user 1.31 system 3.33 elapsed 140% CPU
-time.3.tcmalloc.512:0.93 user 0.04 system 0.39 elapsed 243% CPU
-time.3.ptmalloc.1024:1.66 user 0.01 system 0.64 elapsed 260% CPU
-time.3.tcmalloc.1024:0.81 user 0.02 system 0.44 elapsed 187% CPU
-time.3.ptmalloc.2048:2.07 user 0.01 system 0.82 elapsed 252% CPU
-time.3.tcmalloc.2048:1.10 user 0.04 system 0.59 elapsed 191% CPU
-time.3.ptmalloc.4096:2.01 user 0.03 system 0.79 elapsed 258% CPU
-time.3.tcmalloc.4096:0.87 user 0.03 system 0.65 elapsed 137% CPU
-time.3.ptmalloc.8192:2.22 user 0.11 system 0.83 elapsed 280% CPU
-time.3.tcmalloc.8192:0.96 user 0.06 system 0.75 elapsed 135% CPU
-time.3.ptmalloc.16384:2.56 user 0.47 system 1.02 elapsed 295% CPU
-time.3.tcmalloc.16384:0.99 user 0.04 system 1.03 elapsed 99% CPU
-time.3.ptmalloc.32768:3.29 user 1.75 system 1.96 elapsed 256% CPU
-time.3.tcmalloc.32768:1.67 user 0.02 system 1.69 elapsed 99% CPU
-time.3.ptmalloc.65536:4.04 user 6.62 system 4.92 elapsed 216% CPU
-time.3.tcmalloc.65536:1.91 user 0.02 system 1.98 elapsed 97% CPU
-time.3.ptmalloc.131072:5.55 user 17.86 system 12.44 elapsed 188% CPU
-time.3.tcmalloc.131072:2.78 user 0.02 system 2.82 elapsed 99% CPU
-time.4.ptmalloc.64:3.42 user 1.36 system 3.20 elapsed 149% CPU
-time.4.tcmalloc.64:2.42 user 0.02 system 0.71 elapsed 341% CPU
-time.4.ptmalloc.128:3.98 user 1.79 system 3.89 elapsed 148% CPU
-time.4.tcmalloc.128:1.87 user 0.02 system 0.58 elapsed 325% CPU
-time.4.ptmalloc.256:4.06 user 2.14 system 4.12 elapsed 150% CPU
-time.4.tcmalloc.256:1.69 user 0.02 system 0.51 elapsed 331% CPU
-time.4.ptmalloc.512:4.48 user 2.15 system 4.39 elapsed 150% CPU
-time.4.tcmalloc.512:1.62 user 0.03 system 0.52 elapsed 314% CPU
-time.4.ptmalloc.1024:3.18 user 0.03 system 0.84 elapsed 381% CPU
-time.4.tcmalloc.1024:1.53 user 0.02 system 0.56 elapsed 274% CPU
-time.4.ptmalloc.2048:3.24 user 0.02 system 0.84 elapsed 384% CPU
-time.4.tcmalloc.2048:1.44 user 0.04 system 0.66 elapsed 221% CPU
-time.4.ptmalloc.4096:3.50 user 0.04 system 0.91 elapsed 389% CPU
-time.4.tcmalloc.4096:1.31 user 0.01 system 0.89 elapsed 148% CPU
-time.4.ptmalloc.8192:6.77 user 3.85 system 4.14 elapsed 256% CPU
-time.4.tcmalloc.8192:1.20 user 0.05 system 0.97 elapsed 127% CPU
-time.4.ptmalloc.16384:7.08 user 5.06 system 4.63 elapsed 262% CPU
-time.4.tcmalloc.16384:1.27 user 0.03 system 1.25 elapsed 103% CPU
-time.4.ptmalloc.32768:5.57 user 4.22 system 3.31 elapsed 295% CPU
-time.4.tcmalloc.32768:2.17 user 0.03 system 2.25 elapsed 97% CPU
-time.4.ptmalloc.65536:6.11 user 15.05 system 9.19 elapsed 230% CPU
-time.4.tcmalloc.65536:2.51 user 0.02 system 2.57 elapsed 98% CPU
-time.4.ptmalloc.131072:7.58 user 33.15 system 21.28 elapsed 191% CPU
-time.4.tcmalloc.131072:3.57 user 0.07 system 3.66 elapsed 99% CPU
-time.5.ptmalloc.64:4.44 user 2.08 system 4.37 elapsed 148% CPU
-time.5.tcmalloc.64:2.87 user 0.02 system 0.79 elapsed 361% CPU
-time.5.ptmalloc.128:4.77 user 2.77 system 5.14 elapsed 146% CPU
-time.5.tcmalloc.128:2.65 user 0.03 system 0.72 elapsed 367% CPU
-time.5.ptmalloc.256:5.82 user 2.88 system 5.49 elapsed 158% CPU
-time.5.tcmalloc.256:2.33 user 0.01 system 0.66 elapsed 352% CPU
-time.5.ptmalloc.512:6.27 user 3.11 system 5.34 elapsed 175% CPU
-time.5.tcmalloc.512:2.14 user 0.03 system 0.70 elapsed 307% CPU
-time.5.ptmalloc.1024:6.82 user 3.18 system 5.23 elapsed 191% CPU
-time.5.tcmalloc.1024:2.20 user 0.02 system 0.70 elapsed 313% CPU
-time.5.ptmalloc.2048:6.57 user 3.46 system 5.22 elapsed 192% CPU
-time.5.tcmalloc.2048:2.15 user 0.03 system 0.82 elapsed 264% CPU
-time.5.ptmalloc.4096:8.75 user 5.09 system 5.26 elapsed 263% CPU
-time.5.tcmalloc.4096:1.68 user 0.03 system 1.08 elapsed 158% CPU
-time.5.ptmalloc.8192:4.48 user 0.61 system 1.51 elapsed 335% CPU
-time.5.tcmalloc.8192:1.47 user 0.07 system 1.18 elapsed 129% CPU
-time.5.ptmalloc.16384:5.71 user 1.98 system 2.14 elapsed 358% CPU
-time.5.tcmalloc.16384:1.58 user 0.03 system 1.52 elapsed 105% CPU
-time.5.ptmalloc.32768:7.19 user 7.81 system 5.53 elapsed 270% CPU
-time.5.tcmalloc.32768:2.63 user 0.05 system 2.72 elapsed 98% CPU
-time.5.ptmalloc.65536:8.45 user 23.51 system 14.30 elapsed 223% CPU
-time.5.tcmalloc.65536:3.12 user 0.05 system 3.21 elapsed 98% CPU
-time.5.ptmalloc.131072:10.22 user 43.63 system 27.84 elapsed 193% CPU
-time.5.tcmalloc.131072:4.42 user 0.07 system 4.51 elapsed 99% CPU
-time.6.ptmalloc.64:5.57 user 2.56 system 5.08 elapsed 159% CPU
-time.6.tcmalloc.64:3.20 user 0.01 system 0.89 elapsed 360% CPU
-time.6.ptmalloc.128:5.98 user 3.52 system 5.71 elapsed 166% CPU
-time.6.tcmalloc.128:2.76 user 0.02 system 0.78 elapsed 355% CPU
-time.6.ptmalloc.256:4.61 user 0.02 system 1.19 elapsed 389% CPU
-time.6.tcmalloc.256:2.65 user 0.02 system 0.74 elapsed 356% CPU
-time.6.ptmalloc.512:8.28 user 3.88 system 6.61 elapsed 183% CPU
-time.6.tcmalloc.512:2.60 user 0.02 system 0.72 elapsed 362% CPU
-time.6.ptmalloc.1024:4.75 user 0.00 system 1.22 elapsed 387% CPU
-time.6.tcmalloc.1024:2.56 user 0.02 system 0.79 elapsed 325% CPU
-time.6.ptmalloc.2048:8.90 user 4.59 system 6.15 elapsed 219% CPU
-time.6.tcmalloc.2048:2.37 user 0.06 system 0.96 elapsed 250% CPU
-time.6.ptmalloc.4096:11.41 user 7.02 system 6.31 elapsed 291% CPU
-time.6.tcmalloc.4096:1.82 user 0.03 system 1.19 elapsed 154% CPU
-time.6.ptmalloc.8192:11.64 user 8.25 system 5.97 elapsed 332% CPU
-time.6.tcmalloc.8192:1.83 user 0.07 system 1.38 elapsed 136% CPU
-time.6.ptmalloc.16384:7.44 user 2.98 system 3.01 elapsed 345% CPU
-time.6.tcmalloc.16384:1.83 user 0.08 system 1.80 elapsed 105% CPU
-time.6.ptmalloc.32768:8.69 user 12.35 system 8.04 elapsed 261% CPU
-time.6.tcmalloc.32768:3.14 user 0.06 system 3.24 elapsed 98% CPU
-time.6.ptmalloc.65536:10.52 user 35.43 system 20.75 elapsed 221% CPU
-time.6.tcmalloc.65536:3.62 user 0.03 system 3.72 elapsed 98% CPU
-time.6.ptmalloc.131072:11.74 user 59.00 system 36.93 elapsed 191% CPU
-time.6.tcmalloc.131072:5.33 user 0.04 system 5.42 elapsed 98% CPU
-time.7.ptmalloc.64:6.60 user 3.45 system 6.01 elapsed 167% CPU
-time.7.tcmalloc.64:3.50 user 0.04 system 0.94 elapsed 376% CPU
-time.7.ptmalloc.128:7.09 user 4.25 system 6.69 elapsed 169% CPU
-time.7.tcmalloc.128:3.13 user 0.03 system 0.84 elapsed 374% CPU
-time.7.ptmalloc.256:9.28 user 4.85 system 7.20 elapsed 196% CPU
-time.7.tcmalloc.256:3.06 user 0.02 system 0.82 elapsed 375% CPU
-time.7.ptmalloc.512:9.13 user 4.78 system 6.79 elapsed 204% CPU
-time.7.tcmalloc.512:2.99 user 0.03 system 0.83 elapsed 359% CPU
-time.7.ptmalloc.1024:10.85 user 6.41 system 7.52 elapsed 229% CPU
-time.7.tcmalloc.1024:3.05 user 0.04 system 0.89 elapsed 345% CPU
-time.7.ptmalloc.2048:5.65 user 0.08 system 1.47 elapsed 388% CPU
-time.7.tcmalloc.2048:3.01 user 0.01 system 0.98 elapsed 306% CPU
-time.7.ptmalloc.4096:6.09 user 0.08 system 1.58 elapsed 389% CPU
-time.7.tcmalloc.4096:2.25 user 0.03 system 1.32 elapsed 171% CPU
-time.7.ptmalloc.8192:6.73 user 0.85 system 1.99 elapsed 379% CPU
-time.7.tcmalloc.8192:2.22 user 0.08 system 1.61 elapsed 142% CPU
-time.7.ptmalloc.16384:8.87 user 4.66 system 4.04 elapsed 334% CPU
-time.7.tcmalloc.16384:2.07 user 0.07 system 2.07 elapsed 103% CPU
-time.7.ptmalloc.32768:10.61 user 17.85 system 11.22 elapsed 253% CPU
-time.7.tcmalloc.32768:3.68 user 0.06 system 3.79 elapsed 98% CPU
-time.7.ptmalloc.65536:13.05 user 45.97 system 27.28 elapsed 216% CPU
-time.7.tcmalloc.65536:4.16 user 0.07 system 4.31 elapsed 98% CPU
-time.7.ptmalloc.131072:13.22 user 62.67 system 41.33 elapsed 183% CPU
-time.7.tcmalloc.131072:6.10 user 0.06 system 6.25 elapsed 98% CPU
-time.8.ptmalloc.64:7.31 user 3.92 system 6.39 elapsed 175% CPU
-time.8.tcmalloc.64:4.00 user 0.01 system 1.04 elapsed 383% CPU
-time.8.ptmalloc.128:9.40 user 5.41 system 7.67 elapsed 192% CPU
-time.8.tcmalloc.128:3.61 user 0.02 system 0.94 elapsed 386% CPU
-time.8.ptmalloc.256:10.61 user 6.35 system 7.96 elapsed 212% CPU
-time.8.tcmalloc.256:3.30 user 0.02 system 0.99 elapsed 335% CPU
-time.8.ptmalloc.512:12.42 user 7.10 system 8.79 elapsed 221% CPU
-time.8.tcmalloc.512:3.35 user 0.04 system 0.94 elapsed 358% CPU
-time.8.ptmalloc.1024:13.63 user 8.54 system 8.95 elapsed 247% CPU
-time.8.tcmalloc.1024:3.44 user 0.02 system 0.96 elapsed 359% CPU
-time.8.ptmalloc.2048:6.45 user 0.03 system 1.67 elapsed 386% CPU
-time.8.tcmalloc.2048:3.55 user 0.05 system 1.09 elapsed 328% CPU
-time.8.ptmalloc.4096:6.83 user 0.26 system 1.80 elapsed 393% CPU
-time.8.tcmalloc.4096:2.78 user 0.06 system 1.53 elapsed 185% CPU
-time.8.ptmalloc.8192:7.59 user 1.29 system 2.36 elapsed 376% CPU
-time.8.tcmalloc.8192:2.57 user 0.07 system 1.84 elapsed 142% CPU
-time.8.ptmalloc.16384:10.15 user 6.20 system 5.20 elapsed 314% CPU
-time.8.tcmalloc.16384:2.40 user 0.05 system 2.42 elapsed 101% CPU
-time.8.ptmalloc.32768:11.82 user 24.48 system 14.60 elapsed 248% CPU
-time.8.tcmalloc.32768:4.37 user 0.05 system 4.47 elapsed 98% CPU
-time.8.ptmalloc.65536:15.41 user 58.94 system 34.42 elapsed 215% CPU
-time.8.tcmalloc.65536:4.90 user 0.04 system 4.96 elapsed 99% CPU
-time.8.ptmalloc.131072:16.07 user 82.93 system 52.51 elapsed 188% CPU
-time.8.tcmalloc.131072:7.13 user 0.04 system 7.19 elapsed 99% CPU
-time.9.ptmalloc.64:8.44 user 4.59 system 6.92 elapsed 188% CPU
-time.9.tcmalloc.64:4.00 user 0.02 system 1.05 elapsed 382% CPU
-time.9.ptmalloc.128:10.92 user 6.14 system 8.31 elapsed 205% CPU
-time.9.tcmalloc.128:3.88 user 0.02 system 1.01 elapsed 382% CPU
-time.9.ptmalloc.256:13.01 user 7.75 system 9.12 elapsed 227% CPU
-time.9.tcmalloc.256:3.89 user 0.01 system 1.00 elapsed 386% CPU
-time.9.ptmalloc.512:14.96 user 8.89 system 9.73 elapsed 244% CPU
-time.9.tcmalloc.512:3.80 user 0.03 system 1.01 elapsed 377% CPU
-time.9.ptmalloc.1024:15.42 user 10.20 system 9.80 elapsed 261% CPU
-time.9.tcmalloc.1024:3.86 user 0.03 system 1.19 elapsed 325% CPU
-time.9.ptmalloc.2048:7.24 user 0.02 system 1.87 elapsed 388% CPU
-time.9.tcmalloc.2048:3.98 user 0.05 system 1.26 elapsed 319% CPU
-time.9.ptmalloc.4096:7.96 user 0.18 system 2.06 elapsed 394% CPU
-time.9.tcmalloc.4096:3.27 user 0.04 system 1.69 elapsed 195% CPU
-time.9.ptmalloc.8192:9.00 user 1.63 system 2.79 elapsed 380% CPU
-time.9.tcmalloc.8192:3.00 user 0.06 system 2.05 elapsed 148% CPU
-time.9.ptmalloc.16384:12.07 user 8.13 system 6.55 elapsed 308% CPU
-time.9.tcmalloc.16384:2.85 user 0.05 system 2.75 elapsed 105% CPU
-time.9.ptmalloc.32768:13.99 user 29.65 system 18.02 elapsed 242% CPU
-time.9.tcmalloc.32768:4.98 user 0.06 system 5.13 elapsed 98% CPU
-time.9.ptmalloc.65536:16.89 user 70.42 system 42.11 elapsed 207% CPU
-time.9.tcmalloc.65536:5.55 user 0.04 system 5.65 elapsed 98% CPU
-time.9.ptmalloc.131072:18.53 user 94.11 system 61.17 elapsed 184% CPU
-time.9.tcmalloc.131072:8.06 user 0.04 system 8.16 elapsed 99% CPU
-time.10.ptmalloc.64:9.81 user 5.70 system 7.42 elapsed 208% CPU
-time.10.tcmalloc.64:4.43 user 0.03 system 1.20 elapsed 370% CPU
-time.10.ptmalloc.128:12.69 user 7.81 system 9.02 elapsed 227% CPU
-time.10.tcmalloc.128:4.27 user 0.02 system 1.13 elapsed 378% CPU
-time.10.ptmalloc.256:15.04 user 9.53 system 9.92 elapsed 247% CPU
-time.10.tcmalloc.256:4.23 user 0.02 system 1.09 elapsed 388% CPU
-time.10.ptmalloc.512:17.30 user 10.46 system 10.61 elapsed 261% CPU
-time.10.tcmalloc.512:4.14 user 0.05 system 1.10 elapsed 379% CPU
-time.10.ptmalloc.1024:16.96 user 9.38 system 9.30 elapsed 283% CPU
-time.10.tcmalloc.1024:4.27 user 0.06 system 1.18 elapsed 366% CPU
-time.10.ptmalloc.2048:8.07 user 0.03 system 2.06 elapsed 393% CPU
-time.10.tcmalloc.2048:4.49 user 0.07 system 1.33 elapsed 342% CPU
-time.10.ptmalloc.4096:8.66 user 0.25 system 2.25 elapsed 394% CPU
-time.10.tcmalloc.4096:3.61 user 0.05 system 1.78 elapsed 205% CPU
-time.10.ptmalloc.8192:21.52 user 17.43 system 10.41 elapsed 374% CPU
-time.10.tcmalloc.8192:3.59 user 0.10 system 2.33 elapsed 158% CPU
-time.10.ptmalloc.16384:20.55 user 24.85 system 12.55 elapsed 361% CPU
-time.10.tcmalloc.16384:3.29 user 0.04 system 3.22 elapsed 103% CPU
-time.10.ptmalloc.32768:15.23 user 38.13 system 22.49 elapsed 237% CPU
-time.10.tcmalloc.32768:5.62 user 0.05 system 5.72 elapsed 99% CPU
-time.10.ptmalloc.65536:19.80 user 85.42 system 49.98 elapsed 210% CPU
-time.10.tcmalloc.65536:6.23 user 0.09 system 6.36 elapsed 99% CPU
-time.10.ptmalloc.131072:20.91 user 106.97 system 69.08 elapsed 185% CPU
-time.10.tcmalloc.131072:8.94 user 0.09 system 9.09 elapsed 99% CPU
-time.11.ptmalloc.64:10.82 user 6.34 system 7.92 elapsed 216% CPU
-time.11.tcmalloc.64:4.80 user 0.03 system 1.24 elapsed 387% CPU
-time.11.ptmalloc.128:14.58 user 8.61 system 9.81 elapsed 236% CPU
-time.11.tcmalloc.128:4.65 user 0.03 system 1.21 elapsed 384% CPU
-time.11.ptmalloc.256:17.38 user 10.98 system 10.75 elapsed 263% CPU
-time.11.tcmalloc.256:4.51 user 0.03 system 1.18 elapsed 384% CPU
-time.11.ptmalloc.512:19.18 user 11.71 system 10.95 elapsed 282% CPU
-time.11.tcmalloc.512:4.57 user 0.02 system 1.19 elapsed 384% CPU
-time.11.ptmalloc.1024:19.94 user 12.41 system 10.48 elapsed 308% CPU
-time.11.tcmalloc.1024:4.71 user 0.05 system 1.29 elapsed 367% CPU
-time.11.ptmalloc.2048:8.70 user 0.04 system 2.35 elapsed 371% CPU
-time.11.tcmalloc.2048:4.97 user 0.07 system 1.43 elapsed 350% CPU
-time.11.ptmalloc.4096:22.47 user 18.43 system 10.82 elapsed 377% CPU
-time.11.tcmalloc.4096:4.22 user 0.03 system 1.91 elapsed 221% CPU
-time.11.ptmalloc.8192:11.61 user 2.38 system 3.73 elapsed 374% CPU
-time.11.tcmalloc.8192:3.74 user 0.09 system 2.46 elapsed 155% CPU
-time.11.ptmalloc.16384:14.13 user 13.38 system 9.60 elapsed 286% CPU
-time.11.tcmalloc.16384:3.61 user 0.03 system 3.63 elapsed 100% CPU
-time.11.ptmalloc.32768:17.92 user 43.84 system 26.74 elapsed 230% CPU
-time.11.tcmalloc.32768:6.31 user 0.03 system 6.45 elapsed 98% CPU
-time.11.ptmalloc.65536:22.40 user 96.38 system 58.30 elapsed 203% CPU
-time.11.tcmalloc.65536:6.92 user 0.12 system 6.98 elapsed 100% CPU
-time.11.ptmalloc.131072:21.03 user 108.04 system 72.78 elapsed 177% CPU
-time.11.tcmalloc.131072:9.79 user 0.08 system 9.94 elapsed 99% CPU
-time.12.ptmalloc.64:12.23 user 7.16 system 8.38 elapsed 231% CPU
-time.12.tcmalloc.64:5.21 user 0.05 system 1.41 elapsed 371% CPU
-time.12.ptmalloc.128:16.97 user 10.19 system 10.47 elapsed 259% CPU
-time.12.tcmalloc.128:5.10 user 0.02 system 1.31 elapsed 390% CPU
-time.12.ptmalloc.256:19.99 user 12.10 system 11.57 elapsed 277% CPU
-time.12.tcmalloc.256:5.01 user 0.03 system 1.29 elapsed 390% CPU
-time.12.ptmalloc.512:21.85 user 12.66 system 11.46 elapsed 300% CPU
-time.12.tcmalloc.512:5.05 user 0.00 system 1.32 elapsed 379% CPU
-time.12.ptmalloc.1024:9.40 user 0.04 system 2.40 elapsed 393% CPU
-time.12.tcmalloc.1024:5.14 user 0.02 system 1.39 elapsed 369% CPU
-time.12.ptmalloc.2048:9.72 user 0.04 system 2.49 elapsed 391% CPU
-time.12.tcmalloc.2048:5.74 user 0.05 system 1.62 elapsed 355% CPU
-time.12.ptmalloc.4096:10.64 user 0.20 system 2.75 elapsed 393% CPU
-time.12.tcmalloc.4096:4.45 user 0.03 system 2.04 elapsed 218% CPU
-time.12.ptmalloc.8192:12.66 user 3.30 system 4.30 elapsed 371% CPU
-time.12.tcmalloc.8192:4.21 user 0.13 system 2.65 elapsed 163% CPU
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-<!doctype html public "-//w3c//dtd html 4.01 transitional//en">
-<!-- $Id: $ -->
-<html>
-<head>
-<title>TCMalloc : Thread-Caching Malloc</title>
-<link rel="stylesheet" href="designstyle.css">
-<style type="text/css">
- em {
- color: red;
- font-style: normal;
- }
-</style>
-</head>
-<body>
-
-<h1>TCMalloc : Thread-Caching Malloc</h1>
-
-<address>Sanjay Ghemawat</address>
-
-<h2><A name=motivation>Motivation</A></h2>
-
-<p>TCMalloc is faster than the glibc 2.3 malloc (available as a
-separate library called ptmalloc2) and other mallocs that I have
-tested. ptmalloc2 takes approximately 300 nanoseconds to execute a
-malloc/free pair on a 2.8 GHz P4 (for small objects). The TCMalloc
-implementation takes approximately 50 nanoseconds for the same
-operation pair. Speed is important for a malloc implementation
-because if malloc is not fast enough, application writers are inclined
-to write their own custom free lists on top of malloc. This can lead
-to extra complexity, and more memory usage unless the application
-writer is very careful to appropriately size the free lists and
-scavenge idle objects out of the free list.</p>
-
-<p>TCMalloc also reduces lock contention for multi-threaded programs.
-For small objects, there is virtually zero contention. For large
-objects, TCMalloc tries to use fine grained and efficient spinlocks.
-ptmalloc2 also reduces lock contention by using per-thread arenas but
-there is a big problem with ptmalloc2's use of per-thread arenas. In
-ptmalloc2 memory can never move from one arena to another. This can
-lead to huge amounts of wasted space. For example, in one Google
-application, the first phase would allocate approximately 300MB of
-memory for its URL canonicalization data structures. When the first
-phase finished, a second phase would be started in the same address
-space. If this second phase was assigned a different arena than the
-one used by the first phase, this phase would not reuse any of the
-memory left after the first phase and would add another 300MB to the
-address space. Similar memory blowup problems were also noticed in
-other applications.</p>
-
-<p>Another benefit of TCMalloc is space-efficient representation of
-small objects. For example, N 8-byte objects can be allocated while
-using space approximately <code>8N * 1.01</code> bytes. I.e., a
-one-percent space overhead. ptmalloc2 uses a four-byte header for
-each object and (I think) rounds up the size to a multiple of 8 bytes
-and ends up using <code>16N</code> bytes.</p>
-
-
-<h2><A NAME="Usage">Usage</A></h2>
-
-<p>To use TCMalloc, just link TCMalloc into your application via the
-"-ltcmalloc" linker flag.</p>
-
-<p>You can use TCMalloc in applications you didn't compile yourself,
-by using LD_PRELOAD:</p>
-<pre>
- $ LD_PRELOAD="/usr/lib/libtcmalloc.so" <binary>
-</pre>
-<p>LD_PRELOAD is tricky, and we don't necessarily recommend this mode
-of usage.</p>
-
-<p>TCMalloc includes a <A HREF="heap_checker.html">heap checker</A>
-and <A HREF="heapprofile.html">heap profiler</A> as well.</p>
-
-<p>If you'd rather link in a version of TCMalloc that does not include
-the heap profiler and checker (perhaps to reduce binary size for a
-static binary), you can link in <code>libtcmalloc_minimal</code>
-instead.</p>
-
-
-<h2><A NAME="Overview">Overview</A></h2>
-
-<p>TCMalloc assigns each thread a thread-local cache. Small
-allocations are satisfied from the thread-local cache. Objects are
-moved from central data structures into a thread-local cache as
-needed, and periodic garbage collections are used to migrate memory
-back from a thread-local cache into the central data structures.</p>
-<center><img src="overview.gif"></center>
-
-<p>TCMalloc treats objects with size <= 256K ("small" objects)
-differently from larger objects. Large objects are allocated directly
-from the central heap using a page-level allocator (a page is a 8K
-aligned region of memory). I.e., a large object is always
-page-aligned and occupies an integral number of pages.</p>
-
-<p>A run of pages can be carved up into a sequence of small objects,
-each equally sized. For example a run of one page (4K) can be carved
-up into 32 objects of size 128 bytes each.</p>
-
-
-<h2><A NAME="Small_Object_Allocation">Small Object Allocation</A></h2>
-
-<p>Each small object size maps to one of approximately 88 allocatable
-size-classes. For example, all allocations in the range 961 to 1024
-bytes are rounded up to 1024. The size-classes are spaced so that
-small sizes are separated by 8 bytes, larger sizes by 16 bytes, even
-larger sizes by 32 bytes, and so forth. The maximal spacing is
-controlled so that not too much space is wasted when an allocation
-request falls just past the end of a size class and has to be rounded
-up to the next class.</p>
-
-<p>A thread cache contains a singly linked list of free objects per
-size-class.</p>
-<center><img src="threadheap.gif"></center>
-
-<p>When allocating a small object: (1) We map its size to the
-corresponding size-class. (2) Look in the corresponding free list in
-the thread cache for the current thread. (3) If the free list is not
-empty, we remove the first object from the list and return it. When
-following this fast path, TCMalloc acquires no locks at all. This
-helps speed-up allocation significantly because a lock/unlock pair
-takes approximately 100 nanoseconds on a 2.8 GHz Xeon.</p>
-
-<p>If the free list is empty: (1) We fetch a bunch of objects from a
-central free list for this size-class (the central free list is shared
-by all threads). (2) Place them in the thread-local free list. (3)
-Return one of the newly fetched objects to the applications.</p>
-
-<p>If the central free list is also empty: (1) We allocate a run of
-pages from the central page allocator. (2) Split the run into a set
-of objects of this size-class. (3) Place the new objects on the
-central free list. (4) As before, move some of these objects to the
-thread-local free list.</p>
-
-<h3><A NAME="Sizing_Thread_Cache_Free_Lists">
- Sizing Thread Cache Free Lists</A></h3>
-
-<p>It is important to size the thread cache free lists correctly. If
-the free list is too small, we'll need to go to the central free list
-too often. If the free list is too big, we'll waste memory as objects
-sit idle in the free list.</p>
-
-<p>Note that the thread caches are just as important for deallocation
-as they are for allocation. Without a cache, each deallocation would
-require moving the memory to the central free list. Also, some threads
-have asymmetric alloc/free behavior (e.g. producer and consumer threads),
-so sizing the free list correctly gets trickier.</p>
-
-<p>To size the free lists appropriately, we use a slow-start algorithm
-to determine the maximum length of each individual free list. As the
-free list is used more frequently, its maximum length grows. However,
-if a free list is used more for deallocation than allocation, its
-maximum length will grow only up to a point where the whole list can
-be efficiently moved to the central free list at once.</p>
-
-<p>The psuedo-code below illustrates this slow-start algorithm. Note
-that <code>num_objects_to_move</code> is specific to each size class.
-By moving a list of objects with a well-known length, the central
-cache can efficiently pass these lists between thread caches. If
-a thread cache wants fewer than <code>num_objects_to_move</code>,
-the operation on the central free list has linear time complexity.
-The downside of always using <code>num_objects_to_move</code> as
-the number of objects to transfer to and from the central cache is
-that it wastes memory in threads that don't need all of those objects.
-
-<pre>
-Start each freelist max_length at 1.
-
-Allocation
- if freelist empty {
- fetch min(max_length, num_objects_to_move) from central list;
- if max_length < num_objects_to_move { // slow-start
- max_length++;
- } else {
- max_length += num_objects_to_move;
- }
- }
-
-Deallocation
- if length > max_length {
- // Don't try to release num_objects_to_move if we don't have that many.
- release min(max_length, num_objects_to_move) objects to central list
- if max_length < num_objects_to_move {
- // Slow-start up to num_objects_to_move.
- max_length++;
- } else if max_length > num_objects_to_move {
- // If we consistently go over max_length, shrink max_length.
- overages++;
- if overages > kMaxOverages {
- max_length -= num_objects_to_move;
- overages = 0;
- }
- }
- }
-</pre>
-
-See also the section on <a href="#Garbage_Collection">Garbage Collection</a>
-to see how it affects the <code>max_length</code>.
-
-<h2><A NAME="Large_Object_Allocation">Large Object Allocation</A></h2>
-
-<p>A large object size (> 256K) is rounded up to a page size (8K)
-and is handled by a central page heap. The central page heap is again
-an array of free lists. For <code>i < 128</code>, the
-<code>k</code>th entry is a free list of runs that consist of
-<code>k</code> pages. The <code>128</code>th entry is a free list of
-runs that have length <code>>= 128</code> pages: </p>
-<center><img src="pageheap.gif"></center>
-
-<p>An allocation for <code>k</code> pages is satisfied by looking in
-the <code>k</code>th free list. If that free list is empty, we look
-in the next free list, and so forth. Eventually, we look in the last
-free list if necessary. If that fails, we fetch memory from the
-system (using <code>sbrk</code>, <code>mmap</code>, or by mapping in
-portions of <code>/dev/mem</code>).</p>
-
-<p>If an allocation for <code>k</code> pages is satisfied by a run
-of pages of length > <code>k</code>, the remainder of the
-run is re-inserted back into the appropriate free list in the
-page heap.</p>
-
-
-<h2><A NAME="Spans">Spans</A></h2>
-
-<p>The heap managed by TCMalloc consists of a set of pages. A run of
-contiguous pages is represented by a <code>Span</code> object. A span
-can either be <em>allocated</em>, or <em>free</em>. If free, the span
-is one of the entries in a page heap linked-list. If allocated, it is
-either a large object that has been handed off to the application, or
-a run of pages that have been split up into a sequence of small
-objects. If split into small objects, the size-class of the objects
-is recorded in the span.</p>
-
-<p>A central array indexed by page number can be used to find the span to
-which a page belongs. For example, span <em>a</em> below occupies 2
-pages, span <em>b</em> occupies 1 page, span <em>c</em> occupies 5
-pages and span <em>d</em> occupies 3 pages.</p>
-<center><img src="spanmap.gif"></center>
-
-<p>In a 32-bit address space, the central array is represented by a a
-2-level radix tree where the root contains 32 entries and each leaf
-contains 2^14 entries (a 32-bit address space has 2^19 8K pages, and
-the first level of tree divides the 2^19 pages by 2^5). This leads to
-a starting memory usage of 64KB of space (2^14*4 bytes) for the
-central array, which seems acceptable.</p>
-
-<p>On 64-bit machines, we use a 3-level radix tree.</p>
-
-
-<h2><A NAME="Deallocation">Deallocation</A></h2>
-
-<p>When an object is deallocated, we compute its page number and look
-it up in the central array to find the corresponding span object. The
-span tells us whether or not the object is small, and its size-class
-if it is small. If the object is small, we insert it into the
-appropriate free list in the current thread's thread cache. If the
-thread cache now exceeds a predetermined size (2MB by default), we run
-a garbage collector that moves unused objects from the thread cache
-into central free lists.</p>
-
-<p>If the object is large, the span tells us the range of pages covered
-by the object. Suppose this range is <code>[p,q]</code>. We also
-lookup the spans for pages <code>p-1</code> and <code>q+1</code>. If
-either of these neighboring spans are free, we coalesce them with the
-<code>[p,q]</code> span. The resulting span is inserted into the
-appropriate free list in the page heap.</p>
-
-
-<h2>Central Free Lists for Small Objects</h2>
-
-<p>As mentioned before, we keep a central free list for each
-size-class. Each central free list is organized as a two-level data
-structure: a set of spans, and a linked list of free objects per
-span.</p>
-
-<p>An object is allocated from a central free list by removing the
-first entry from the linked list of some span. (If all spans have
-empty linked lists, a suitably sized span is first allocated from the
-central page heap.)</p>
-
-<p>An object is returned to a central free list by adding it to the
-linked list of its containing span. If the linked list length now
-equals the total number of small objects in the span, this span is now
-completely free and is returned to the page heap.</p>
-
-
-<h2><A NAME="Garbage_Collection">Garbage Collection of Thread Caches</A></h2>
-
-<p>Garbage collecting objects from a thread cache keeps the size of
-the cache under control and returns unused objects to the central free
-lists. Some threads need large caches to perform well while others
-can get by with little or no cache at all. When a thread cache goes
-over its <code>max_size</code>, garbage collection kicks in and then the
-thread competes with the other threads for a larger cache.</p>
-
-<p>Garbage collection is run only during a deallocation. We walk over
-all free lists in the cache and move some number of objects from the
-free list to the corresponding central list.</p>
-
-<p>The number of objects to be moved from a free list is determined
-using a per-list low-water-mark <code>L</code>. <code>L</code>
-records the minimum length of the list since the last garbage
-collection. Note that we could have shortened the list by
-<code>L</code> objects at the last garbage collection without
-requiring any extra accesses to the central list. We use this past
-history as a predictor of future accesses and move <code>L/2</code>
-objects from the thread cache free list to the corresponding central
-free list. This algorithm has the nice property that if a thread
-stops using a particular size, all objects of that size will quickly
-move from the thread cache to the central free list where they can be
-used by other threads.</p>
-
-<p>If a thread consistently deallocates more objects of a certain size
-than it allocates, this <code>L/2</code> behavior will cause at least
-<code>L/2</code> objects to always sit in the free list. To avoid
-wasting memory this way, we shrink the maximum length of the freelist
-to converge on <code>num_objects_to_move</code> (see also
-<a href="#Sizing_Thread_Cache_Free_Lists">Sizing Thread Cache Free Lists</a>).
-
-<pre>
-Garbage Collection
- if (L != 0 && max_length > num_objects_to_move) {
- max_length = max(max_length - num_objects_to_move, num_objects_to_move)
- }
-</pre>
-
-<p>The fact that the thread cache went over its <code>max_size</code> is
-an indication that the thread would benefit from a larger cache. Simply
-increasing <code>max_size</code> would use an inordinate amount of memory
-in programs that have lots of active threads. Developers can bound the
-memory used with the flag --tcmalloc_max_total_thread_cache_bytes.</p>
-
-<p>Each thread cache starts with a small <code>max_size</code>
-(e.g. 64KB) so that idle threads won't pre-allocate memory they don't
-need. Each time the cache runs a garbage collection, it will also try
-to grow its <code>max_size</code>. If the sum of the thread cache
-sizes is less than --tcmalloc_max_total_thread_cache_bytes,
-<code>max_size</code> grows easily. If not, thread cache 1 will try
-to steal from thread cache 2 (picked round-robin) by decreasing thread
-cache 2's <code>max_size</code>. In this way, threads that are more
-active will steal memory from other threads more often than they are
-have memory stolen from themselves. Mostly idle threads end up with
-small caches and active threads end up with big caches. Note that
-this stealing can cause the sum of the thread cache sizes to be
-greater than --tcmalloc_max_total_thread_cache_bytes until thread
-cache 2 deallocates some memory to trigger a garbage collection.</p>
-
-<h2><A NAME="performance">Performance Notes</A></h2>
-
-<h3>PTMalloc2 unittest</h3>
-
-<p>The PTMalloc2 package (now part of glibc) contains a unittest
-program <code>t-test1.c</code>. This forks a number of threads and
-performs a series of allocations and deallocations in each thread; the
-threads do not communicate other than by synchronization in the memory
-allocator.</p>
-
-<p><code>t-test1</code> (included in
-<code>tests/tcmalloc/</code>, and compiled as
-<code>ptmalloc_unittest1</code>) was run with a varying numbers of
-threads (1-20) and maximum allocation sizes (64 bytes -
-32Kbytes). These tests were run on a 2.4GHz dual Xeon system with
-hyper-threading enabled, using Linux glibc-2.3.2 from RedHat 9, with
-one million operations per thread in each test. In each case, the test
-was run once normally, and once with
-<code>LD_PRELOAD=libtcmalloc.so</code>.
-
-<p>The graphs below show the performance of TCMalloc vs PTMalloc2 for
-several different metrics. Firstly, total operations (millions) per
-elapsed second vs max allocation size, for varying numbers of
-threads. The raw data used to generate these graphs (the output of the
-<code>time</code> utility) is available in
-<code>t-test1.times.txt</code>.</p>
-
-<table>
-<tr>
- <td><img src="tcmalloc-opspersec.vs.size.1.threads.png"></td>
- <td><img src="tcmalloc-opspersec.vs.size.2.threads.png"></td>
- <td><img src="tcmalloc-opspersec.vs.size.3.threads.png"></td>
-</tr>
-<tr>
- <td><img src="tcmalloc-opspersec.vs.size.4.threads.png"></td>
- <td><img src="tcmalloc-opspersec.vs.size.5.threads.png"></td>
- <td><img src="tcmalloc-opspersec.vs.size.8.threads.png"></td>
-</tr>
-<tr>
- <td><img src="tcmalloc-opspersec.vs.size.12.threads.png"></td>
- <td><img src="tcmalloc-opspersec.vs.size.16.threads.png"></td>
- <td><img src="tcmalloc-opspersec.vs.size.20.threads.png"></td>
-</tr>
-</table>
-
-
-<ul>
- <li> TCMalloc is much more consistently scalable than PTMalloc2 - for
- all thread counts >1 it achieves ~7-9 million ops/sec for small
- allocations, falling to ~2 million ops/sec for larger
- allocations. The single-thread case is an obvious outlier,
- since it is only able to keep a single processor busy and hence
- can achieve fewer ops/sec. PTMalloc2 has a much higher variance
- on operations/sec - peaking somewhere around 4 million ops/sec
- for small allocations and falling to <1 million ops/sec for
- larger allocations.
-
- <li> TCMalloc is faster than PTMalloc2 in the vast majority of
- cases, and particularly for small allocations. Contention
- between threads is less of a problem in TCMalloc.
-
- <li> TCMalloc's performance drops off as the allocation size
- increases. This is because the per-thread cache is
- garbage-collected when it hits a threshold (defaulting to
- 2MB). With larger allocation sizes, fewer objects can be stored
- in the cache before it is garbage-collected.
-
- <li> There is a noticeable drop in TCMalloc's performance at ~32K
- maximum allocation size; at larger sizes performance drops less
- quickly. This is due to the 32K maximum size of objects in the
- per-thread caches; for objects larger than this TCMalloc
- allocates from the central page heap.
-</ul>
-
-<p>Next, operations (millions) per second of CPU time vs number of
-threads, for max allocation size 64 bytes - 128 Kbytes.</p>
-
-<table>
-<tr>
- <td><img src="tcmalloc-opspercpusec.vs.threads.64.bytes.png"></td>
- <td><img src="tcmalloc-opspercpusec.vs.threads.256.bytes.png"></td>
- <td><img src="tcmalloc-opspercpusec.vs.threads.1024.bytes.png"></td>
-</tr>
-<tr>
- <td><img src="tcmalloc-opspercpusec.vs.threads.4096.bytes.png"></td>
- <td><img src="tcmalloc-opspercpusec.vs.threads.8192.bytes.png"></td>
- <td><img src="tcmalloc-opspercpusec.vs.threads.16384.bytes.png"></td>
-</tr>
-<tr>
- <td><img src="tcmalloc-opspercpusec.vs.threads.32768.bytes.png"></td>
- <td><img src="tcmalloc-opspercpusec.vs.threads.65536.bytes.png"></td>
- <td><img src="tcmalloc-opspercpusec.vs.threads.131072.bytes.png"></td>
-</tr>
-</table>
-
-<p>Here we see again that TCMalloc is both more consistent and more
-efficient than PTMalloc2. For max allocation sizes <32K, TCMalloc
-typically achieves ~2-2.5 million ops per second of CPU time with a
-large number of threads, whereas PTMalloc achieves generally 0.5-1
-million ops per second of CPU time, with a lot of cases achieving much
-less than this figure. Above 32K max allocation size, TCMalloc drops
-to 1-1.5 million ops per second of CPU time, and PTMalloc drops almost
-to zero for large numbers of threads (i.e. with PTMalloc, lots of CPU
-time is being burned spinning waiting for locks in the heavily
-multi-threaded case).</p>
-
-
-<H2><A NAME="runtime">Modifying Runtime Behavior</A></H2>
-
-<p>You can more finely control the behavior of the tcmalloc via
-environment variables.</p>
-
-<p>Generally useful flags:</p>
-
-<table frame=box rules=sides cellpadding=5 width=100%>
-
-<tr valign=top>
- <td><code>TCMALLOC_SAMPLE_PARAMETER</code></td>
- <td>default: 0</td>
- <td>
- The approximate gap between sampling actions. That is, we
- take one sample approximately once every
- <code>tcmalloc_sample_parmeter</code> bytes of allocation.
- This sampled heap information is available via
- <code>MallocExtension::GetHeapSample()</code> or
- <code>MallocExtension::ReadStackTraces()</code>. A reasonable
- value is 524288.
- </td>
-</tr>
-
-<tr valign=top>
- <td><code>TCMALLOC_RELEASE_RATE</code></td>
- <td>default: 1.0</td>
- <td>
- Rate at which we release unused memory to the system, via
- <code>madvise(MADV_DONTNEED)</code>, on systems that support
- it. Zero means we never release memory back to the system.
- Increase this flag to return memory faster; decrease it
- to return memory slower. Reasonable rates are in the
- range [0,10].
- </td>
-</tr>
-
-<tr valign=top>
- <td><code>TCMALLOC_LARGE_ALLOC_REPORT_THRESHOLD</code></td>
- <td>default: 1073741824</td>
- <td>
- Allocations larger than this value cause a stack trace to be
- dumped to stderr. The threshold for dumping stack traces is
- increased by a factor of 1.125 every time we print a message so
- that the threshold automatically goes up by a factor of ~1000
- every 60 messages. This bounds the amount of extra logging
- generated by this flag. Default value of this flag is very large
- and therefore you should see no extra logging unless the flag is
- overridden.
- </td>
-</tr>
-
-<tr valign=top>
- <td><code>TCMALLOC_MAX_TOTAL_THREAD_CACHE_BYTES</code></td>
- <td>default: 16777216</td>
- <td>
- Bound on the total amount of bytes allocated to thread caches. This
- bound is not strict, so it is possible for the cache to go over this
- bound in certain circumstances. This value defaults to 16MB. For
- applications with many threads, this may not be a large enough cache,
- which can affect performance. If you suspect your application is not
- scaling to many threads due to lock contention in TCMalloc, you can
- try increasing this value. This may improve performance, at a cost
- of extra memory use by TCMalloc. See <a href="#Garbage_Collection">
- Garbage Collection</a> for more details.
- </td>
-</tr>
-
-</table>
-
-<p>Advanced "tweaking" flags, that control more precisely how tcmalloc
-tries to allocate memory from the kernel.</p>
-
-<table frame=box rules=sides cellpadding=5 width=100%>
-
-<tr valign=top>
- <td><code>TCMALLOC_SKIP_MMAP</code></td>
- <td>default: false</td>
- <td>
- If true, do not try to use <code>mmap</code> to obtain memory
- from the kernel.
- </td>
-</tr>
-
-<tr valign=top>
- <td><code>TCMALLOC_SKIP_SBRK</code></td>
- <td>default: false</td>
- <td>
- If true, do not try to use <code>sbrk</code> to obtain memory
- from the kernel.
- </td>
-</tr>
-
-<tr valign=top>
- <td><code>TCMALLOC_DEVMEM_START</code></td>
- <td>default: 0</td>
- <td>
- Physical memory starting location in MB for <code>/dev/mem</code>
- allocation. Setting this to 0 disables <code>/dev/mem</code>
- allocation.
- </td>
-</tr>
-
-<tr valign=top>
- <td><code>TCMALLOC_DEVMEM_LIMIT</code></td>
- <td>default: 0</td>
- <td>
- Physical memory limit location in MB for <code>/dev/mem</code>
- allocation. Setting this to 0 means no limit.
- </td>
-</tr>
-
-<tr valign=top>
- <td><code>TCMALLOC_DEVMEM_DEVICE</code></td>
- <td>default: /dev/mem</td>
- <td>
- Device to use for allocating unmanaged memory.
- </td>
-</tr>
-
-<tr valign=top>
- <td><code>TCMALLOC_MEMFS_MALLOC_PATH</code></td>
- <td>default: ""</td>
- <td>
- If set, specify a path where hugetlbfs or tmpfs is mounted.
- This may allow for speedier allocations.
- </td>
-</tr>
-
-<tr valign=top>
- <td><code>TCMALLOC_MEMFS_LIMIT_MB</code></td>
- <td>default: 0</td>
- <td>
- Limit total memfs allocation size to specified number of MB.
- 0 means "no limit".
- </td>
-</tr>
-
-<tr valign=top>
- <td><code>TCMALLOC_MEMFS_ABORT_ON_FAIL</code></td>
- <td>default: false</td>
- <td>
- If true, abort() whenever memfs_malloc fails to satisfy an allocation.
- </td>
-</tr>
-
-<tr valign=top>
- <td><code>TCMALLOC_MEMFS_IGNORE_MMAP_FAIL</code></td>
- <td>default: false</td>
- <td>
- If true, ignore failures from mmap.
- </td>
-</tr>
-
-<tr valign=top>
- <td><code>TCMALLOC_MEMFS_MAP_PRVIATE</code></td>
- <td>default: false</td>
- <td>
- If true, use MAP_PRIVATE when mapping via memfs, not MAP_SHARED.
- </td>
-</tr>
-
-</table>
-
-
-<H2><A NAME="compiletime">Modifying Behavior In Code</A></H2>
-
-<p>The <code>MallocExtension</code> class, in
-<code>malloc_extension.h</code>, provides a few knobs that you can
-tweak in your program, to affect tcmalloc's behavior.</p>
-
-<h3>Releasing Memory Back to the System</h3>
-
-<p>By default, tcmalloc will release no-longer-used memory back to the
-kernel gradually, over time. The <a
-href="#runtime">tcmalloc_release_rate</a> flag controls how quickly
-this happens. You can also force a release at a given point in the
-progam execution like so:</p>
-<pre>
- MallocExtension::instance()->ReleaseFreeMemory();
-</pre>
-
-<p>You can also call <code>SetMemoryReleaseRate()</code> to change the
-<code>tcmalloc_release_rate</code> value at runtime, or
-<code>GetMemoryReleaseRate</code> to see what the current release rate
-is.</p>
-
-<h3>Memory Introspection</h3>
-
-<p>There are several routines for getting a human-readable form of the
-current memory usage:</p>
-<pre>
- MallocExtension::instance()->GetStats(buffer, buffer_length);
- MallocExtension::instance()->GetHeapSample(&string);
- MallocExtension::instance()->GetHeapGrowthStacks(&string);
-</pre>
-
-<p>The last two create files in the same format as the heap-profiler,
-and can be passed as data files to pprof. The first is human-readable
-and is meant for debugging.</p>
-
-<h3>Generic Tcmalloc Status</h3>
-
-<p>TCMalloc has support for setting and retrieving arbitrary
-'properties':</p>
-<pre>
- MallocExtension::instance()->SetNumericProperty(property_name, value);
- MallocExtension::instance()->GetNumericProperty(property_name, &value);
-</pre>
-
-<p>It is possible for an application to set and get these properties,
-but the most useful is when a library sets the properties so the
-application can read them. Here are the properties TCMalloc defines;
-you can access them with a call like
-<code>MallocExtension::instance()->GetNumericProperty("generic.heap_size",
-&value);</code>:</p>
-
-<table frame=box rules=sides cellpadding=5 width=100%>
-
-<tr valign=top>
- <td><code>generic.current_allocated_bytes</code></td>
- <td>
- Number of bytes used by the application. This will not typically
- match the memory use reported by the OS, because it does not
- include TCMalloc overhead or memory fragmentation.
- </td>
-</tr>
-
-<tr valign=top>
- <td><code>generic.heap_size</code></td>
- <td>
- Bytes of system memory reserved by TCMalloc.
- </td>
-</tr>
-
-<tr valign=top>
- <td><code>tcmalloc.pageheap_free_bytes</code></td>
- <td>
- Number of bytes in free, mapped pages in page heap. These bytes
- can be used to fulfill allocation requests. They always count
- towards virtual memory usage, and unless the underlying memory is
- swapped out by the OS, they also count towards physical memory
- usage.
- </td>
-</tr>
-
-<tr valign=top>
- <td><code>tcmalloc.pageheap_unmapped_bytes</code></td>
- <td>
- Number of bytes in free, unmapped pages in page heap. These are
- bytes that have been released back to the OS, possibly by one of
- the MallocExtension "Release" calls. They can be used to fulfill
- allocation requests, but typically incur a page fault. They
- always count towards virtual memory usage, and depending on the
- OS, typically do not count towards physical memory usage.
- </td>
-</tr>
-
-<tr valign=top>
- <td><code>tcmalloc.slack_bytes</code></td>
- <td>
- Sum of pageheap_free_bytes and pageheap_unmapped_bytes. Provided
- for backwards compatibility only. Do not use.
- </td>
-</tr>
-
-<tr valign=top>
- <td><code>tcmalloc.max_total_thread_cache_bytes</code></td>
- <td>
- A limit to how much memory TCMalloc dedicates for small objects.
- Higher numbers trade off more memory use for -- in some situations
- -- improved efficiency.
- </td>
-</tr>
-
-<tr valign=top>
- <td><code>tcmalloc.current_total_thread_cache_bytes</code></td>
- <td>
- A measure of some of the memory TCMalloc is using (for
- small objects).
- </td>
-</tr>
-
-</table>
-
-<h2><A NAME="caveats">Caveats</A></h2>
-
-<p>For some systems, TCMalloc may not work correctly with
-applications that aren't linked against <code>libpthread.so</code> (or
-the equivalent on your OS). It should work on Linux using glibc 2.3,
-but other OS/libc combinations have not been tested.</p>
-
-<p>TCMalloc may be somewhat more memory hungry than other mallocs,
-(but tends not to have the huge blowups that can happen with other
-mallocs). In particular, at startup TCMalloc allocates approximately
-240KB of internal memory.</p>
-
-<p>Don't try to load TCMalloc into a running binary (e.g., using JNI
-in Java programs). The binary will have allocated some objects using
-the system malloc, and may try to pass them to TCMalloc for
-deallocation. TCMalloc will not be able to handle such objects.</p>
-
-<hr>
-
-<address>Sanjay Ghemawat, Paul Menage<br>
-<!-- Created: Tue Dec 19 10:43:14 PST 2000 -->
-<!-- hhmts start -->
-Last modified: Sat Feb 24 13:11:38 PST 2007 (csilvers)
-<!-- hhmts end -->
-</address>
-
-</body>
-</html>
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-rankdir=LR
-node [shape=box, width=0.3, height=0.3]
-nodesep=.05
-
-heap [shape=record, height=2, label="<f0>class 0|<f1>class 1|<f2>class 2|..."]
-O0 [label=""]
-O1 [label=""]
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-O4 [label=""]
-O5 [label=""]
-sep1 [shape=plaintext, label="..."]
-sep2 [shape=plaintext, label="..."]
-sep3 [shape=plaintext, label="..."]
-
-heap:f0 -> O0 -> O1 -> sep1
-heap:f1 -> O2 -> O3 -> sep2
-heap:f2 -> O4 -> O5 -> sep3
-
-}
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