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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: Thu, 02 Nov 2006 07:49:03 +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 combine.c compilation at -O0 level:
Overall memory needed: 28370k
Peak memory use before GGC: 9293k
Peak memory use after GGC: 8832k
Maximum of released memory in single GGC run: 2666k
Garbage: 36856k
Leak: 6441k
Overhead: 4860k
GGC runs: 280
comparing combine.c compilation at -O1 level:
Overall memory needed: 40210k
Peak memory use before GGC: 17281k
Peak memory use after GGC: 17106k
Maximum of released memory in single GGC run: 2382k
Garbage: 57445k
Leak: 6505k
Overhead: 6200k
GGC runs: 355
comparing combine.c compilation at -O2 level:
Overall memory needed: 29790k
Peak memory use before GGC: 17277k
Peak memory use after GGC: 17106k
Maximum of released memory in single GGC run: 2883k
Garbage: 76254k
Leak: 6593k
Overhead: 8744k
GGC runs: 420
comparing combine.c compilation at -O3 level:
Overall memory needed: 28894k
Peak memory use before GGC: 18217k
Peak memory use after GGC: 17833k
Maximum of released memory in single GGC run: 4104k
Garbage: 106198k
Leak: 6668k
Overhead: 12303k
GGC runs: 469
comparing insn-attrtab.c compilation at -O0 level:
Overall memory needed: 88230k
Peak memory use before GGC: 69777k
Peak memory use after GGC: 44187k
Maximum of released memory in single GGC run: 36963k
Garbage: 129065k
Leak: 9501k
Overhead: 16993k
GGC runs: 216
comparing insn-attrtab.c compilation at -O1 level:
Overall memory needed: 114178k
Peak memory use before GGC: 90363k
Peak memory use after GGC: 83725k
Maximum of released memory in single GGC run: 31806k
Garbage: 277740k
Leak: 9343k
Overhead: 29775k
GGC runs: 223
comparing insn-attrtab.c compilation at -O2 level:
Ovarall memory allocated via mmap and sbrk decreased from 134058k to 129338k, overall -3.65%
Overall memory needed: 134058k -> 129338k
Peak memory use before GGC: 92593k
Peak memory use after GGC: 84705k
Maximum of released memory in single GGC run: 30380k
Garbage: 319045k
Leak: 9345k
Overhead: 36716k
GGC runs: 247
comparing insn-attrtab.c compilation at -O3 level:
Overall memory needed: 115578k -> 115570k
Peak memory use before GGC: 92618k
Peak memory use after GGC: 84731k
Maximum of released memory in single GGC run: 30570k
Garbage: 319697k
Leak: 9348k
Overhead: 36914k
GGC runs: 250
comparing Gerald's testcase PR8361 compilation at -O0 level:
Overall memory needed: 119502k
Peak memory use before GGC: 92646k
Peak memory use after GGC: 91729k
Maximum of released memory in single GGC run: 19299k
Garbage: 205559k
Leak: 47677k
Overhead: 20816k
GGC runs: 402
comparing Gerald's testcase PR8361 compilation at -O1 level:
Overall memory needed: 119242k
Peak memory use before GGC: 97832k
Peak memory use after GGC: 95623k
Maximum of released memory in single GGC run: 18569k
Garbage: 444257k
Leak: 50010k
Overhead: 32813k
GGC runs: 552
comparing Gerald's testcase PR8361 compilation at -O2 level:
Overall memory needed: 119250k
Peak memory use before GGC: 97832k
Peak memory use after GGC: 95622k
Maximum of released memory in single GGC run: 18570k
Garbage: 505913k
Leak: 50715k
Overhead: 40462k
GGC runs: 610
comparing Gerald's testcase PR8361 compilation at -O3 level:
Overall memory needed: 118938k
Peak memory use before GGC: 97879k
Peak memory use after GGC: 96909k
Maximum of released memory in single GGC run: 18832k
Garbage: 525475k
Leak: 50292k
Overhead: 40990k
GGC runs: 624
comparing PR rtl-optimization/28071 testcase compilation at -O0 level:
Overall memory needed: 137946k
Peak memory use before GGC: 81898k
Peak memory use after GGC: 58777k
Maximum of released memory in single GGC run: 45493k
Garbage: 147195k
Leak: 7522k
Overhead: 25300k
GGC runs: 83
comparing PR rtl-optimization/28071 testcase compilation at -O1 level:
Overall memory needed: 424310k
Peak memory use before GGC: 205260k
Peak memory use after GGC: 201036k
Maximum of released memory in single GGC run: 101716k
Garbage: 271708k
Leak: 47588k
Overhead: 30829k
GGC runs: 101
comparing PR rtl-optimization/28071 testcase compilation at -O2 level:
Overall memory needed: 350966k -> 351474k
Peak memory use before GGC: 206011k
Peak memory use after GGC: 201787k
Maximum of released memory in single GGC run: 108042k
Garbage: 350433k
Leak: 48171k
Overhead: 46275k
GGC runs: 108
comparing PR rtl-optimization/28071 testcase compilation at -O3 -fno-tree-pre -fno-tree-fre level:
Overall memory needed: 535442k
Peak memory use before GGC: 314918k
Peak memory use after GGC: 293261k
Maximum of released memory in single GGC run: 163448k
Garbage: 491202k
Leak: 65503k
Overhead: 59091k
GGC runs: 95
Head of the ChangeLog is:
--- /usr/src/SpecTests/sandbox-britten-memory/x86_64/mem-result/ChangeLog 2006-11-02 02:40:15.000000000 +0000
+++ /usr/src/SpecTests/sandbox-britten-memory/gcc/gcc/ChangeLog 2006-11-02 06:19:57.000000000 +0000
@@ -1,3 +1,9 @@
+2006-11-01 Kaveh R. Ghazi <ghazi@caip.rutgers.edu>
+
+ PR middle-end/29335
+ * builtins.c (do_mpfr_sincos): New.
+ (fold_builtin_1): Use it to fold builtin sincos.
+
2006-11-01 Roger Sayle <roger@eyesopen.com>
* config/darwin.h (CPP_SPEC): Handle -pthread, transforming
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.