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A recent patch increased 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: Tue, 18 Sep 2007 10:11:36 +0000
- Subject: A recent patch increased 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: 7028k -> 7027k
Peak memory use before GGC: 1191k -> 1180k
Peak memory use after GGC: 1091k -> 1079k
Maximum of released memory in single GGC run: 125k -> 126k
Garbage: 249k
Leak: 1105k -> 1084k
Overhead: 150k -> 141k
GGC runs: 4
comparing empty function compilation at -O0 -g level:
Overall memory needed: 7044k -> 7043k
Peak memory use before GGC: 1219k -> 1207k
Peak memory use after GGC: 1118k -> 1107k
Maximum of released memory in single GGC run: 128k
Garbage: 252k
Leak: 1138k -> 1116k
Overhead: 155k -> 145k
GGC runs: 4
comparing empty function compilation at -O1 level:
Overall memory needed: 7088k -> 7083k
Peak memory use before GGC: 1191k -> 1180k
Peak memory use after GGC: 1083k -> 1071k
Maximum of released memory in single GGC run: 121k
Garbage: 251k
Leak: 1106k -> 1084k
Overhead: 151k -> 141k
GGC runs: 3
comparing empty function compilation at -O2 level:
Overall memory needed: 7100k -> 7099k
Peak memory use before GGC: 1192k -> 1180k
Peak memory use after GGC: 1083k -> 1072k
Maximum of released memory in single GGC run: 121k
Garbage: 255k
Leak: 1107k -> 1085k
Overhead: 152k -> 142k
GGC runs: 3
comparing empty function compilation at -O3 level:
Overall memory needed: 7100k -> 7099k
Peak memory use before GGC: 1192k -> 1180k
Peak memory use after GGC: 1083k -> 1072k
Maximum of released memory in single GGC run: 121k
Garbage: 255k
Leak: 1107k -> 1085k
Overhead: 152k -> 142k
GGC runs: 3
comparing combine.c compilation at -O0 level:
Overall memory needed: 22084k -> 22043k
Peak memory use before GGC: 8321k -> 8285k
Peak memory use after GGC: 7661k -> 7624k
Maximum of released memory in single GGC run: 1581k -> 1580k
Garbage: 38808k -> 38811k
Leak: 6237k -> 6169k
Overhead: 5054k -> 5021k
GGC runs: 369
comparing combine.c compilation at -O0 -g level:
Overall memory needed: 24100k -> 24055k
Peak memory use before GGC: 10151k -> 10115k
Peak memory use after GGC: 9425k -> 9389k
Maximum of released memory in single GGC run: 1875k
Garbage: 39162k -> 39134k
Leak: 9064k -> 8996k
Overhead: 5726k -> 5693k
GGC runs: 341 -> 343
comparing combine.c compilation at -O1 level:
Overall memory needed: 33168k -> 33131k
Peak memory use before GGC: 17092k -> 17056k
Peak memory use after GGC: 16904k -> 16868k
Maximum of released memory in single GGC run: 1378k -> 1379k
Garbage: 52447k -> 52440k
Leak: 6376k -> 6308k
Overhead: 6035k -> 6002k
GGC runs: 439 -> 440
comparing combine.c compilation at -O2 level:
Overall memory needed: 35428k -> 35391k
Peak memory use before GGC: 17169k -> 17127k
Peak memory use after GGC: 16993k -> 16957k
Maximum of released memory in single GGC run: 1335k
Garbage: 71359k -> 71352k
Leak: 6703k -> 6632k
Overhead: 8289k -> 8254k
GGC runs: 507
comparing combine.c compilation at -O3 level:
Overall memory needed: 38852k -> 38815k
Peak memory use before GGC: 17368k -> 17337k
Peak memory use after GGC: 17046k -> 17010k
Maximum of released memory in single GGC run: 2130k
Garbage: 92724k -> 92707k
Leak: 6818k -> 6750k
Overhead: 10792k -> 10758k
GGC runs: 536 -> 537
comparing insn-attrtab.c compilation at -O0 level:
Overall memory needed: 138536k -> 138507k
Peak memory use before GGC: 58675k -> 58644k
Peak memory use after GGC: 32168k -> 32137k
Maximum of released memory in single GGC run: 34144k
Garbage: 131586k -> 131586k
Leak: 8967k -> 8909k
Overhead: 14859k -> 14830k
GGC runs: 294 -> 295
comparing insn-attrtab.c compilation at -O0 -g level:
Amount of produced GGC garbage increased from 131809k to 132063k, overall 0.19%
Overall memory needed: 139792k -> 139751k
Peak memory use before GGC: 59824k -> 59793k
Peak memory use after GGC: 33317k -> 33286k
Maximum of released memory in single GGC run: 34144k
Garbage: 131809k -> 132063k
Leak: 10643k -> 10345k
Overhead: 15239k -> 15211k
GGC runs: 289 -> 291
comparing insn-attrtab.c compilation at -O1 level:
Overall memory needed: 149760k -> 149715k
Peak memory use before GGC: 57168k -> 57137k
Peak memory use after GGC: 50938k -> 50907k
Maximum of released memory in single GGC run: 24232k -> 24233k
Garbage: 212484k -> 212481k
Leak: 9859k -> 9801k
Overhead: 24863k -> 24835k
GGC runs: 319
comparing insn-attrtab.c compilation at -O2 level:
Overall memory needed: 187316k -> 187283k
Peak memory use before GGC: 57802k -> 57772k
Peak memory use after GGC: 52531k -> 52500k
Maximum of released memory in single GGC run: 22973k
Garbage: 253951k -> 253948k
Leak: 10947k -> 10889k
Overhead: 30609k -> 30581k
GGC runs: 350
comparing insn-attrtab.c compilation at -O3 level:
Overall memory needed: 194548k -> 194519k
Peak memory use before GGC: 69795k -> 69764k
Peak memory use after GGC: 63228k -> 63198k
Maximum of released memory in single GGC run: 23355k
Garbage: 280713k -> 280710k
Leak: 10952k -> 10894k
Overhead: 32376k -> 32348k
GGC runs: 350
comparing Gerald's testcase PR8361 compilation at -O0 level:
Overall memory needed: 155488k -> 155472k
Peak memory use before GGC: 89723k
Peak memory use after GGC: 88830k
Maximum of released memory in single GGC run: 18062k
Garbage: 210310k
Leak: 53020k
Overhead: 26478k
GGC runs: 418
comparing Gerald's testcase PR8361 compilation at -O0 -g level:
Overall memory needed: 174576k -> 174580k
Peak memory use before GGC: 101166k
Peak memory use after GGC: 100164k
Maximum of released memory in single GGC run: 18248k
Garbage: 215902k
Leak: 74843k
Overhead: 31887k
GGC runs: 392
comparing Gerald's testcase PR8361 compilation at -O1 level:
Overall memory needed: 121731k
Peak memory use before GGC: 88622k
Peak memory use after GGC: 87745k
Maximum of released memory in single GGC run: 17329k
Garbage: 297826k
Leak: 52266k
Overhead: 30850k
GGC runs: 516
comparing Gerald's testcase PR8361 compilation at -O2 level:
Overall memory needed: 127539k
Peak memory use before GGC: 88802k
Peak memory use after GGC: 87914k
Maximum of released memory in single GGC run: 17313k
Garbage: 364715k
Leak: 53354k
Overhead: 38016k
GGC runs: 594
comparing Gerald's testcase PR8361 compilation at -O3 level:
Overall memory needed: 130955k
Peak memory use before GGC: 89908k
Peak memory use after GGC: 89013k
Maximum of released memory in single GGC run: 17671k
Garbage: 391468k
Leak: 53602k
Overhead: 40419k
GGC runs: 610
comparing PR rtl-optimization/28071 testcase compilation at -O0 level:
Overall memory needed: 379411k -> 379339k
Peak memory use before GGC: 101524k -> 101510k
Peak memory use after GGC: 57178k -> 57163k
Maximum of released memory in single GGC run: 50582k
Garbage: 179457k -> 179454k
Leak: 6325k -> 6299k
Overhead: 30890k -> 30876k
GGC runs: 105
comparing PR rtl-optimization/28071 testcase compilation at -O0 -g level:
Overall memory needed: 380223k -> 380147k
Peak memory use before GGC: 102158k -> 102144k
Peak memory use after GGC: 57811k -> 57797k
Maximum of released memory in single GGC run: 50583k
Garbage: 179514k -> 179559k
Leak: 8033k -> 8007k
Overhead: 31355k -> 31342k
GGC runs: 110
comparing PR rtl-optimization/28071 testcase compilation at -O1 level:
Overall memory needed: 295568k -> 296999k
Peak memory use before GGC: 80827k -> 80813k
Peak memory use after GGC: 73215k -> 73201k
Maximum of released memory in single GGC run: 40017k
Garbage: 236019k -> 236017k
Leak: 15663k -> 15637k
Overhead: 31663k -> 31649k
GGC runs: 103
comparing PR rtl-optimization/28071 testcase compilation at -O2 level:
Overall memory needed: 271184k -> 271175k
Peak memory use before GGC: 78201k -> 78187k
Peak memory use after GGC: 73215k -> 73201k
Maximum of released memory in single GGC run: 33754k -> 33750k
Garbage: 246066k -> 246060k
Leak: 15752k -> 15726k
Overhead: 33730k -> 33716k
GGC runs: 116
comparing PR rtl-optimization/28071 testcase compilation at -O3 -fno-tree-pre -fno-tree-fre level:
Overall memory needed: 1017652k -> 1017567k
Peak memory use before GGC: 166843k -> 166829k
Peak memory use after GGC: 156407k -> 156393k
Maximum of released memory in single GGC run: 83495k
Garbage: 357355k -> 357360k
Leak: 25895k -> 25869k
Overhead: 46235k -> 46221k
GGC runs: 97
Head of the ChangeLog is:
--- /usr/src/SpecTests/sandbox-britten-memory/x86_64/mem-result/ChangeLog 2007-09-17 15:32:20.000000000 +0000
+++ /usr/src/SpecTests/sandbox-britten-memory/gcc/gcc/ChangeLog 2007-09-18 07:47:08.000000000 +0000
@@ -1,3 +1,74 @@
+2007-09-17 Kaveh R. Ghazi <ghazi@caip.rutgers.edu>
+
+ * tree-cfg.c (is_ctrl_altering_stmt, tree_block_ends_with_call_p):
+ Don't use const_get_call_expr_in.
+ * tree-gimple.c (const_get_call_expr_in): Delete.
+ * tree-gimple.h (const_get_call_expr_in): Likewise.
+
+2007-09-18 Richard Sandiford <rsandifo@nildram.co.uk>
+
+ * df-scan.c (df_notes_rescan): Do nothing if the instruction does
+ not yet have a basic block.
+ * dse.c (find_shift_sequence): Don't set DF_NO_INSN_RESCAN.
+
+2007-09-18 Richard Sandiford <rsandifo@nildram.co.uk>
+
+ * config/mips/mips.c (mips_file_start): Add ".previous" directives
+ to both ".section"s.
+
+2007-09-17 Richard Sandiford <rsandifo@nildram.co.uk>
+
+ * config/mips/mips.c (mips_output_mi_thunk): Use
+ mips_function_ok_for_sibcall and const_call_insn_operand
+ to determine if a direct sibcall is allowed. Use
+ mips_classify_symbol to determine a global pointer is needed.
+
+2007-09-17 Richard Sandiford <rsandifo@nildram.co.uk>
+
+ * config/mips/mips.md (*clear_upper32): Use "W" as the memory operand.
+
+2007-09-17 Chao-ying Fu <fu@mips.com>
+ Nigel Stephens <nigel@mips.com>
+
+ * config/fixed-bit.h: New file.
+ * config/fixed-bit.c: New file.
+ * doc/libgcc.texi (Fixed-point fractional library routines): New node.
+
+2007-09-18 Jakub Jelinek <jakub@redhat.com>
+
+ * c-format.h (format_kind_info): Add alloc_char field.
+ * c-format.c (scanf_flag_specs): Add 'm'.
+ (scanf_flag_pairs): Add 'a', 'm' pair.
+ (scan_char_table): Allow 'm' modifier for c, s, [, C and S.
+ (format_types_orig): Add alloc_char fields.
+ (check_format_info_main): Rename aflag to alloc_flag.
+ Handle fki->alloc_char. modifier after width and before length
+ modifiers. Move FMT_FLAG_SCANF_A_KLUDGE handling before
+ length modifiers as well.
+ * config/sol2-c.c (solaris_format_types): Add alloc_char field.
+
+ PR middle-end/33423
+ * builtins.c (expand_builtin_memory_chk): Handle COMPOUND_EXPRs
+ returned by build_call_expr.
+
+2007-09-17 Eric Botcazou <ebotcazou@adacore.com>
+
+ * tree-sra.c (maybe_lookup_element_for_expr) <COMPONENT_REF>: Return
+ NULL for variable-sized records too.
+ (sra_walk_expr) <COMPONENT_REF>: Stop at variable-sized records too.
+
+2007-09-17 Tom Tromey <tromey@redhat.com>
+
+ * c-decl.c (pushdecl): Don't set DECL_LANG_SPECIFIC.
+ (c_builtin_function): Likewise.
+ (grokdeclarator): Likewise.
+
+2007-09-17 Zdenek Dvorak <ook@ucw.cz>
+
+ PR rtl-optimization/26449
+ * loop-invariant.c (move_invariant_reg): Do not use force_operand.
+ (seq_insns_valid_p): Removed.
+
2007-09-17 Eric Botcazou <ebotcazou@adacore.com>
* tree-nomudflap.c (gate_mudflap): New static function.
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.