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A recent patch decreased GCC's memory consumption.
- From: gcctest at suse dot de
- To: jh at suse dot cz, gcc-regression at gcc dot gnu dot org
- Date: Sat, 19 Jan 2008 19:01:01 +0000
- Subject: A recent patch decreased GCC's memory consumption.
Hi,
I am a friendly script caring about memory consumption in GCC. Please
contact jh@suse.cz if something is going wrong.
Comparing memory consumption on compilation of combine.i, insn-attrtab.i,
and generate-3.4.ii I got:
comparing empty function compilation at -O0 level:
Overall memory needed: 8151k
Peak memory use before GGC: 1096k
Peak memory use after GGC: 994k
Maximum of released memory in single GGC run: 129k
Garbage: 237k
Leak: 951k
Overhead: 80k
GGC runs: 2
Testing has produced no results
Testing has produced no results
comparing empty function compilation at -O0 -g level:
Overall memory needed: 8167k
Peak memory use before GGC: 1123k
Peak memory use after GGC: 1021k
Maximum of released memory in single GGC run: 131k
Garbage: 239k
Leak: 984k
Overhead: 84k
GGC runs: 3
Testing has produced no results
Testing has produced no results
comparing empty function compilation at -O1 level:
Overall memory needed: 8211k
Peak memory use before GGC: 1096k
Peak memory use after GGC: 994k
Maximum of released memory in single GGC run: 131k
Garbage: 239k
Leak: 952k
Overhead: 81k
GGC runs: 2
Pre-IPA-Garbage: 226k
Pre-IPA-Leak: 954k
Pre-IPA-Overhead: 79k
Post-IPA-Garbage: 226k
Post-IPA-Leak: 954k
Post-IPA-Overhead: 79k
comparing empty function compilation at -O2 level:
Overall memory needed: 8231k
Peak memory use before GGC: 1096k
Peak memory use after GGC: 994k
Maximum of released memory in single GGC run: 134k
Garbage: 243k
Leak: 953k
Overhead: 81k
GGC runs: 2
Pre-IPA-Garbage: 226k
Pre-IPA-Leak: 955k
Pre-IPA-Overhead: 79k
Post-IPA-Garbage: 226k
Post-IPA-Leak: 955k
Post-IPA-Overhead: 79k
comparing empty function compilation at -O3 level:
Overall memory needed: 8231k
Peak memory use before GGC: 1096k
Peak memory use after GGC: 994k
Maximum of released memory in single GGC run: 134k
Garbage: 243k
Leak: 953k
Overhead: 81k
GGC runs: 2
Pre-IPA-Garbage: 226k
Pre-IPA-Leak: 955k
Pre-IPA-Overhead: 79k
Post-IPA-Garbage: 226k
Post-IPA-Leak: 955k
Post-IPA-Overhead: 79k
comparing combine.c compilation at -O0 level:
Overall memory needed: 22703k
Peak memory use before GGC: 7809k
Peak memory use after GGC: 7186k
Maximum of released memory in single GGC run: 1550k
Garbage: 37949k
Leak: 5506k
Overhead: 4649k
GGC runs: 371
Testing has produced no results
Testing has produced no results
comparing combine.c compilation at -O0 -g level:
Overall memory needed: 24707k
Peak memory use before GGC: 9648k
Peak memory use after GGC: 8954k
Maximum of released memory in single GGC run: 1838k
Garbage: 38291k
Leak: 8380k
Overhead: 5276k
GGC runs: 342
Testing has produced no results
Testing has produced no results
comparing combine.c compilation at -O1 level:
Overall memory needed: 33103k -> 32919k
Peak memory use before GGC: 16345k
Peak memory use after GGC: 16161k
Maximum of released memory in single GGC run: 1362k
Garbage: 51471k
Leak: 5660k
Overhead: 5782k
GGC runs: 443
Pre-IPA-Garbage: 13923k
Pre-IPA-Leak: 17182k
Pre-IPA-Overhead: 2129k
Post-IPA-Garbage: 13923k
Post-IPA-Leak: 17182k
Post-IPA-Overhead: 2129k
comparing combine.c compilation at -O2 level:
Overall memory needed: 35931k -> 35775k
Peak memory use before GGC: 16446k
Peak memory use after GGC: 16280k
Maximum of released memory in single GGC run: 1316k
Garbage: 71130k
Leak: 5986k
Overhead: 8064k
GGC runs: 512
Pre-IPA-Garbage: 14080k
Pre-IPA-Leak: 17247k
Pre-IPA-Overhead: 2144k
Post-IPA-Garbage: 14080k
Post-IPA-Leak: 17247k
Post-IPA-Overhead: 2144k
comparing combine.c compilation at -O3 level:
Overall memory needed: 39043k
Peak memory use before GGC: 16623k
Peak memory use after GGC: 16301k
Maximum of released memory in single GGC run: 2063k
Garbage: 93127k
Leak: 6109k
Overhead: 10687k
GGC runs: 546
Pre-IPA-Garbage: 14086k
Pre-IPA-Leak: 17267k
Pre-IPA-Overhead: 2146k
Post-IPA-Garbage: 14086k
Post-IPA-Leak: 17267k
Post-IPA-Overhead: 2146k
comparing insn-attrtab.c compilation at -O0 level:
Overall memory needed: 137443k
Peak memory use before GGC: 56999k
Peak memory use after GGC: 31456k
Maximum of released memory in single GGC run: 33256k
Garbage: 128624k
Leak: 8382k
Overhead: 14368k
GGC runs: 293
Testing has produced no results
Testing has produced no results
comparing insn-attrtab.c compilation at -O0 -g level:
Overall memory needed: 138735k
Peak memory use before GGC: 58141k
Peak memory use after GGC: 32598k
Maximum of released memory in single GGC run: 33256k
Garbage: 128862k
Leak: 10057k
Overhead: 14724k
GGC runs: 289
Testing has produced no results
Testing has produced no results
comparing insn-attrtab.c compilation at -O1 level:
Overall memory needed: 144723k -> 143015k
Peak memory use before GGC: 56211k
Peak memory use after GGC: 49983k
Maximum of released memory in single GGC run: 23976k
Garbage: 206434k
Leak: 9275k
Overhead: 24742k
GGC runs: 315
Pre-IPA-Garbage: 50355k
Pre-IPA-Leak: 49676k
Pre-IPA-Overhead: 7543k
Post-IPA-Garbage: 50355k
Post-IPA-Leak: 49676k
Post-IPA-Overhead: 7543k
comparing insn-attrtab.c compilation at -O2 level:
Overall memory needed: 188015k -> 184483k
Peak memory use before GGC: 56850k
Peak memory use after GGC: 51570k
Maximum of released memory in single GGC run: 22370k
Garbage: 246629k
Leak: 10362k
Overhead: 30342k
GGC runs: 346
Pre-IPA-Garbage: 50427k
Pre-IPA-Leak: 49680k
Pre-IPA-Overhead: 7550k
Post-IPA-Garbage: 50427k
Post-IPA-Leak: 49680k
Post-IPA-Overhead: 7550k
comparing insn-attrtab.c compilation at -O3 level:
Overall memory needed: 192799k -> 190687k
Peak memory use before GGC: 68033k
Peak memory use after GGC: 62277k
Maximum of released memory in single GGC run: 22875k
Garbage: 274537k
Leak: 10399k
Overhead: 32137k
GGC runs: 348
Pre-IPA-Garbage: 50427k
Pre-IPA-Leak: 49680k
Pre-IPA-Overhead: 7550k
Post-IPA-Garbage: 50427k
Post-IPA-Leak: 49680k
Post-IPA-Overhead: 7550k
comparing Gerald's testcase PR8361 compilation at -O0 level:
Overall memory needed: 149537k
Peak memory use before GGC: 84849k
Peak memory use after GGC: 84008k
Maximum of released memory in single GGC run: 17149k
Garbage: 201068k
Leak: 48173k
Overhead: 24079k
GGC runs: 417
Pre-IPA-Garbage: 109656k
Pre-IPA-Leak: 71361k
Pre-IPA-Overhead: 12151k
Post-IPA-Garbage: 109656k
Post-IPA-Leak: 71361k
Post-IPA-Overhead: 12151k
comparing Gerald's testcase PR8361 compilation at -O0 -g level:
Overall memory needed: 169409k
Peak memory use before GGC: 96061k
Peak memory use after GGC: 95110k
Maximum of released memory in single GGC run: 17205k
Garbage: 206714k
Leak: 69898k
Overhead: 29065k
GGC runs: 391
Pre-IPA-Garbage: 110300k
Pre-IPA-Leak: 84641k
Pre-IPA-Overhead: 14727k
Post-IPA-Garbage: 110300k
Post-IPA-Leak: 84641k
Post-IPA-Overhead: 14727k
comparing Gerald's testcase PR8361 compilation at -O1 level:
Overall memory needed: 123363k -> 123359k
Peak memory use before GGC: 84526k
Peak memory use after GGC: 83679k
Maximum of released memory in single GGC run: 16324k
Garbage: 290593k
Leak: 47424k
Overhead: 29408k
GGC runs: 515
Pre-IPA-Garbage: 155089k
Pre-IPA-Leak: 88338k
Pre-IPA-Overhead: 17593k
Post-IPA-Garbage: 155089k
Post-IPA-Leak: 88338k
Post-IPA-Overhead: 17593k
comparing Gerald's testcase PR8361 compilation at -O2 level:
Overall memory needed: 124211k
Peak memory use before GGC: 84748k
Peak memory use after GGC: 83908k
Maximum of released memory in single GGC run: 16363k
Garbage: 357675k
Leak: 48356k
Overhead: 36419k
GGC runs: 588
Pre-IPA-Garbage: 158354k
Pre-IPA-Leak: 88467k
Pre-IPA-Overhead: 17939k
Post-IPA-Garbage: 158354k
Post-IPA-Leak: 88467k
Post-IPA-Overhead: 17939k
comparing Gerald's testcase PR8361 compilation at -O3 level:
Overall memory needed: 126919k
Peak memory use before GGC: 85966k
Peak memory use after GGC: 85090k
Maximum of released memory in single GGC run: 16722k
Garbage: 384952k
Leak: 48972k
Overhead: 38683k
GGC runs: 616
Pre-IPA-Garbage: 161155k
Pre-IPA-Leak: 88746k
Pre-IPA-Overhead: 18193k
Post-IPA-Garbage: 161155k
Post-IPA-Leak: 88746k
Post-IPA-Overhead: 18193k
comparing PR rtl-optimization/28071 testcase compilation at -O0 level:
Overall memory needed: 380432k
Peak memory use before GGC: 101209k
Peak memory use after GGC: 56862k
Maximum of released memory in single GGC run: 50583k
Garbage: 178951k
Leak: 6098k
Overhead: 30783k
GGC runs: 106
Testing has produced no results
Testing has produced no results
comparing PR rtl-optimization/28071 testcase compilation at -O0 -g level:
Overall memory needed: 381232k
Peak memory use before GGC: 101839k
Peak memory use after GGC: 57493k
Maximum of released memory in single GGC run: 50582k
Garbage: 179066k
Leak: 7828k
Overhead: 31215k
GGC runs: 111
Testing has produced no results
Testing has produced no results
comparing PR rtl-optimization/28071 testcase compilation at -O1 level:
Overall memory needed: 438483k -> 438599k
Peak memory use before GGC: 78857k
Peak memory use after GGC: 70436k
Maximum of released memory in single GGC run: 37753k
Garbage: 234534k
Leak: 16073k
Overhead: 35581k
GGC runs: 105
Pre-IPA-Garbage: 52924k
Pre-IPA-Leak: 49245k
Pre-IPA-Overhead: 7121k
Post-IPA-Garbage: 52924k
Post-IPA-Leak: 49245k
Post-IPA-Overhead: 7121k
comparing PR rtl-optimization/28071 testcase compilation at -O2 level:
Overall memory needed: 359811k
Peak memory use before GGC: 75423k
Peak memory use after GGC: 70437k
Maximum of released memory in single GGC run: 32251k
Garbage: 245332k
Leak: 16245k
Overhead: 38769k
GGC runs: 116
Pre-IPA-Garbage: 91836k
Pre-IPA-Leak: 77290k
Pre-IPA-Overhead: 11793k
Post-IPA-Garbage: 91836k
Post-IPA-Leak: 77290k
Post-IPA-Overhead: 11793k
comparing PR rtl-optimization/28071 testcase compilation at -O3 -fno-tree-pre -fno-tree-fre level:
Ovarall memory allocated via mmap and sbrk decreased from 1314011k to 1197519k, overall -9.73%
Overall memory needed: 1314011k -> 1197519k
Peak memory use before GGC: 136584k
Peak memory use after GGC: 127942k
Maximum of released memory in single GGC run: 59911k
Garbage: 371518k
Leak: 24376k
Overhead: 49888k
GGC runs: 103
Pre-IPA-Garbage: 91836k
Pre-IPA-Leak: 77290k
Pre-IPA-Overhead: 11793k
Post-IPA-Garbage: 91836k
Post-IPA-Leak: 77290k
Post-IPA-Overhead: 11793k
Head of the ChangeLog is:
--- /usr/src/SpecTests/sandbox-britten-memory/x86_64/mem-result/ChangeLog 2008-01-18 21:27:51.000000000 +0000
+++ /usr/src/SpecTests/sandbox-britten-memory/gcc/gcc/ChangeLog 2008-01-19 16:01:28.000000000 +0000
@@ -1,3 +1,23 @@
+2008-01-19 Anatoly Sokolov <aesok@post.ru>
+
+ * config/avr/avr.S (_exit): Disable interrupt.
+
+2008-01-18 Kenneth Zadeck <zadeck@naturalbridge.com>
+ Steven Bosscher <stevenb.gcc@gmail.com>
+
+ PR rtl-optimization/26854
+ PR rtl-optimization/34400
+ * df-problems.c (df_live_scratch): New scratch bitmap.
+ (df_live_alloc): Allocate df_live_scratch when doing df_live.
+ (df_live_reset): Clear the proper bitmaps.
+ (df_live_bb_local_compute): Only process the artificial defs once
+ since the order is not important.
+ (df_live_init): Init the df_live sets only with the variables
+ found live by df_lr.
+ (df_live_transfer_function): Use the df_lr sets to prune the
+ df_live sets as they are being computed.
+ (df_live_free): Free df_live_scratch.
+
2008-01-18 Ian Lance Taylor <iant@google.com>
* common.opt: Add fmerge-debug-strings.
The results can be reproduced by building a compiler with
--enable-gather-detailed-mem-stats targetting x86-64
and compiling preprocessed combine.c or testcase from PR8632 with:
-fmem-report --param=ggc-min-heapsize=1024 --param=ggc-min-expand=1 -Ox -Q
The memory consumption summary appears in the dump after detailed listing
of the places they are allocated in. Peak memory consumption is actually
computed by looking for maximal value in {GC XXXX -> YYYY} report.
Your testing script.