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[Bug middle-end/80960] [5/6/7/8 Regression] Huge memory use when compiling a very large test case
- From: "dominiq at lps dot ens.fr" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 02 Jun 2017 22:50:43 +0000
- Subject: [Bug middle-end/80960] [5/6/7/8 Regression] Huge memory use when compiling a very large test case
- Auto-submitted: auto-generated
- References: <bug-80960-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80960
Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rguenth at gcc dot gnu.org
--- Comment #5 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
The most important change (a factor ~10) occurred between revisions r190586
(229Mb) and r190619 (1988Mb).
% time /opt/gcc/gcc4.8p-190586/bin/gfortran -c pr80960.f90 -fdefault-integer-8
-O2 -ftime-report
Execution times (seconds)
phase setup : 0.03 ( 0%) usr 0.02 ( 1%) sys 0.27 ( 0%) wall
192 kB ( 0%) ggc
phase parsing : 0.53 ( 0%) usr 0.06 ( 3%) sys 0.74 ( 0%) wall
9890 kB ( 4%) ggc
phase opt and generate : 156.19 (100%) usr 1.80 (95%) sys 158.35 (99%) wall
218850 kB (95%) ggc
...
alias analysis : 0.15 ( 0%) usr 0.00 ( 0%) sys 0.16 ( 0%) wall
11577 kB ( 5%) ggc
alias stmt walking : 70.08 (45%) usr 0.24 (13%) sys 70.61 (44%) wall
0 kB ( 0%) ggc
...
tree PRE : 0.74 ( 0%) usr 0.04 ( 2%) sys 0.66 ( 0%) wall
6401 kB ( 3%) ggc
tree FRE : 12.30 ( 8%) usr 0.26 (14%) sys 12.33 ( 8%) wall
20878 kB ( 9%) ggc
...
dead store elim1 : 1.61 ( 1%) usr 0.03 ( 2%) sys 1.63 ( 1%) wall
2235 kB ( 1%) ggc
dead store elim2 : 16.73 (11%) usr 0.01 ( 1%) sys 16.74 (11%) wall
3902 kB ( 2%) ggc
...
integrated RA : 24.05 (15%) usr 0.06 ( 3%) sys 24.11 (15%) wall
32565 kB (14%) ggc
reload : 7.82 ( 5%) usr 0.22 (12%) sys 8.04 ( 5%) wall
11106 kB ( 5%) ggc
reload CSE regs : 5.41 ( 3%) usr 0.01 ( 1%) sys 5.42 ( 3%) wall
6071 kB ( 3%) ggc
...
TOTAL : 156.78 1.90 159.42
229270 kB
% time /opt/gcc/gcc4.8a-190619/bin/gfortran -c pr80960.f90 -fdefault-integer-8
-O2 -ftime-report
Execution times (seconds)
phase setup : 0.03 ( 0%) usr 0.02 ( 0%) sys 0.30 ( 0%) wall
192 kB ( 0%) ggc
phase parsing : 0.53 ( 0%) usr 0.06 ( 0%) sys 0.77 ( 0%) wall
9866 kB ( 0%) ggc
phase opt and generate : 446.51 (100%) usr 14.64 (99%) sys 697.47 (100%)
wall 1978039 kB (99%) ggc
...
alias analysis : 0.20 ( 0%) usr 0.00 ( 0%) sys 0.25 ( 0%) wall
11577 kB ( 1%) ggc
alias stmt walking : 23.37 ( 5%) usr 0.40 ( 3%) sys 22.98 ( 3%) wall
0 kB ( 0%) ggc
...
tree PRE : 8.44 ( 2%) usr 0.06 ( 0%) sys 8.84 ( 1%) wall
10424 kB ( 1%) ggc
tree FRE : 17.99 ( 4%) usr 0.25 ( 2%) sys 18.79 ( 3%) wall
26063 kB ( 1%) ggc
...
dead code elimination : 0.12 ( 0%) usr 0.00 ( 0%) sys 0.12 ( 0%) wall
0 kB ( 0%) ggc
dead store elim1 : 2.25 ( 1%) usr 0.01 ( 0%) sys 2.25 ( 0%) wall
2630 kB ( 0%) ggc
dead store elim2 : 15.55 ( 3%) usr 0.02 ( 0%) sys 15.56 ( 2%) wall
3329 kB ( 0%) ggc
CPROP : 0.00 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall
4 kB ( 0%) ggc
CSE 2 : 0.84 ( 0%) usr 0.01 ( 0%) sys 0.83 ( 0%) wall
1 kB ( 0%) ggc
branch prediction : 0.01 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall
10 kB ( 0%) ggc
combiner : 328.61 (73%) usr 9.14 (62%) sys 519.94 (74%) wall
1754285 kB (88%) ggc
regmove : 16.52 ( 4%) usr 0.01 ( 0%) sys 16.54 ( 2%) wall
0 kB ( 0%) ggc
integrated RA : 10.49 ( 2%) usr 0.21 ( 1%) sys 15.92 ( 2%) wall
32785 kB ( 2%) ggc
reload : 5.88 ( 1%) usr 0.40 ( 3%) sys 22.38 ( 3%) wall
9546 kB ( 0%) ggc
reload CSE regs : 4.90 ( 1%) usr 0.00 ( 0%) sys 4.90 ( 1%) wall
6073 kB ( 0%) ggc
...
TOTAL : 447.10 14.81 698.71
1988307 kB