At this location:
http://www.math.purdue.edu/~lucier/gcc/test-files/bugzilla/1/all.i.gz
is the file
-rw-r--r-- 1 lucier lucier 6556015 Mar 22 20:28 all.i.gz
On a 2GHz Mac G5, this file took 3.4GB and 30 minutes to compile using
gcc-4.1.0 configured and compiled with
/bin/rm -rf *; env CC='gcc -mcpu=970 -m64' ../configure
--prefix=/pkgs/gcc-4.1.0 --with-gmp=/opt/local/ --with-mpfr=/opt/local/
--with-as=/usr/local/odcctools-20060123/bin/as
--with-ld=/usr/local/odcctools-20060123/bin/ld --enable-languages=c; make -j 8
bootstrap BOOT_CFLAGS='-mcpu=970 -m64 -O2 -g' >& build.log
I had to build gcc as a 64-bit binary so it could allocate more than 2GB at
some point in the compilation process. (The compiler itself, however, builds
32-bit binaries by default.)
The compile options were
/pkgs/gcc-4.1.0/bin/gcc -mcpu=970 -m64 -no-cpp-precomp -Wall -W -Wno-unused -O1
-fno-math-errno -fschedule-insns2 -fno-trapping-math -fno-strict-aliasing
-fwrapv -fomit-frame-pointer -fPIC -fno-common -bundle -flat_namespace
-undefined suppress -I/usr/local/Gambit-C/include/ -ftime-report -fmem-report
all.i
The reports were
Memory still allocated at the end of the compilation process
Size Allocated Used Overhead
8 16k 14k 480
16 52k 12k 1144
64 1276k 1239k 19k
256 484k 452k 6776
512 36k 25k 504
1024 220k 216k 3080
2048 24k 20k 336
4096 68k 68k 952
8192 56k 56k 392
16384 16k 16k 56
32768 288k 288k 504
65536 64k 64k 56
131072 128k 128k 56
262144 512k 512k 112
524288 512k 512k 56
1048576 1024k 1024k 56
2097152 4096k 4096k 112
112 34M 16M 484k
208 40k 38k 560
192 3344k 3287k 45k
160 28k 6240 392
176 564k 261k 7896
48 2088k 1165k 32k
32 148k 68k 2664
80 35M 2063k 495k
Total 84M 32M 1104k
String pool
entries 158178
identifiers 158178 (100.00%)
slots 262144
bytes 1982k (168k overhead)
table size 2048k
coll/search 1.1104
ins/search 0.1934
avg. entry 12.83 bytes (+/- 7.81)
longest entry 67
??? tree nodes created
(No per-node statistics)
Type hash: size 1021, 598 elements, 0.900368 collisions
DECL_DEBUG_EXPR hash: size 8191, 0 elements, 1.307819 collisions
DECL_VALUE_EXPR hash: size 1021, 0 elements, 0.000000 collisions
Execution times (seconds)
garbage collection : 1.87 ( 0%) usr 0.03 ( 0%) sys 2.38 ( 0%) wall
0 kB ( 0%) ggc
callgraph construction: 1.78 ( 0%) usr 0.36 ( 0%) sys 2.60 ( 0%) wall
21241 kB ( 2%) ggc
callgraph optimization: 0.05 ( 0%) usr 0.00 ( 0%) sys 0.06 ( 0%) wall
0 kB ( 0%) ggc
ipa reference : 0.42 ( 0%) usr 0.14 ( 0%) sys 0.65 ( 0%) wall
7 kB ( 0%) ggc
cfg construction : 0.35 ( 0%) usr 0.00 ( 0%) sys 0.43 ( 0%) wall
8421 kB ( 1%) ggc
cfg cleanup : 103.72 ( 7%) usr 0.71 ( 1%) sys 128.58 ( 7%) wall
2170 kB ( 0%) ggc
trivially dead code : 2.60 ( 0%) usr 0.06 ( 0%) sys 3.32 ( 0%) wall
0 kB ( 0%) ggc
life analysis : 6.42 ( 0%) usr 3.91 ( 3%) sys 12.64 ( 1%) wall
19365 kB ( 2%) ggc
life info update : 1.04 ( 0%) usr 0.03 ( 0%) sys 1.32 ( 0%) wall
525 kB ( 0%) ggc
alias analysis : 1.70 ( 0%) usr 0.07 ( 0%) sys 2.13 ( 0%) wall
16385 kB ( 2%) ggc
register scan : 0.96 ( 0%) usr 0.02 ( 0%) sys 1.28 ( 0%) wall
4 kB ( 0%) ggc
rebuild jump labels : 0.32 ( 0%) usr 0.00 ( 0%) sys 0.38 ( 0%) wall
0 kB ( 0%) ggc
preprocessing : 8.05 ( 1%) usr 13.05 (10%) sys 25.54 ( 1%) wall
2197 kB ( 0%) ggc
lexical analysis : 12.59 ( 1%) usr 25.04 (19%) sys 46.78 ( 2%) wall
0 kB ( 0%) ggc
parser : 9.97 ( 1%) usr 13.25 (10%) sys 28.99 ( 1%) wall
72677 kB ( 7%) ggc
tree gimplify : 1.50 ( 0%) usr 0.07 ( 0%) sys 1.93 ( 0%) wall
30969 kB ( 3%) ggc
tree eh : 0.17 ( 0%) usr 0.01 ( 0%) sys 0.21 ( 0%) wall
0 kB ( 0%) ggc
tree CFG construction : 0.55 ( 0%) usr 0.13 ( 0%) sys 0.81 ( 0%) wall
76077 kB ( 8%) ggc
tree CFG cleanup : 5.82 ( 0%) usr 0.08 ( 0%) sys 7.25 ( 0%) wall
955 kB ( 0%) ggc
tree copy propagation : 5.42 ( 0%) usr 0.44 ( 0%) sys 7.11 ( 0%) wall
12020 kB ( 1%) ggc
tree store copy prop : 0.75 ( 0%) usr 0.05 ( 0%) sys 0.97 ( 0%) wall
1600 kB ( 0%) ggc
tree find ref. vars : 0.23 ( 0%) usr 0.01 ( 0%) sys 0.24 ( 0%) wall
2502 kB ( 0%) ggc
tree PTA : 5.85 ( 0%) usr 0.60 ( 0%) sys 7.92 ( 0%) wall
16435 kB ( 2%) ggc
tree alias analysis : 6.98 ( 0%) usr 11.11 ( 8%) sys 15.83 ( 1%) wall
11736 kB ( 1%) ggc
tree PHI insertion : 1.06 ( 0%) usr 0.21 ( 0%) sys 1.59 ( 0%) wall
24377 kB ( 2%) ggc
tree SSA rewrite : 2.46 ( 0%) usr 0.16 ( 0%) sys 3.29 ( 0%) wall
39166 kB ( 4%) ggc
tree SSA other : 1.22 ( 0%) usr 1.51 ( 1%) sys 3.38 ( 0%) wall
0 kB ( 0%) ggc
tree SSA incremental : 14.15 ( 1%) usr 3.76 ( 3%) sys 22.12 ( 1%) wall
19167 kB ( 2%) ggc
tree operand scan : 628.65 (44%) usr 12.18 ( 9%) sys 814.05 (42%) wall
23896 kB ( 2%) ggc
dominator optimization: 307.01 (21%) usr 2.88 ( 2%) sys 380.36 (20%) wall
63887 kB ( 7%) ggc
tree STORE-CCP : 0.67 ( 0%) usr 0.02 ( 0%) sys 0.87 ( 0%) wall
513 kB ( 0%) ggc
tree CCP : 0.74 ( 0%) usr 0.03 ( 0%) sys 0.95 ( 0%) wall
514 kB ( 0%) ggc
tree split crit edges : 0.37 ( 0%) usr 0.24 ( 0%) sys 0.74 ( 0%) wall
40362 kB ( 4%) ggc
tree reassociation : 0.57 ( 0%) usr 0.02 ( 0%) sys 0.73 ( 0%) wall
0 kB ( 0%) ggc
tree FRE : 12.97 ( 1%) usr 0.75 ( 1%) sys 17.03 ( 1%) wall
40945 kB ( 4%) ggc
tree code sinking : 0.98 ( 0%) usr 0.06 ( 0%) sys 1.27 ( 0%) wall
0 kB ( 0%) ggc
tree linearize phis : 0.15 ( 0%) usr 0.01 ( 0%) sys 0.20 ( 0%) wall
0 kB ( 0%) ggc
tree forward propagate: 0.16 ( 0%) usr 0.01 ( 0%) sys 0.18 ( 0%) wall
0 kB ( 0%) ggc
tree conservative DCE : 1.86 ( 0%) usr 0.03 ( 0%) sys 2.39 ( 0%) wall
0 kB ( 0%) ggc
tree aggressive DCE : 0.86 ( 0%) usr 0.02 ( 0%) sys 1.09 ( 0%) wall
0 kB ( 0%) ggc
tree DSE : 0.73 ( 0%) usr 0.03 ( 0%) sys 0.95 ( 0%) wall
0 kB ( 0%) ggc
PHI merge : 0.02 ( 0%) usr 0.00 ( 0%) sys 0.04 ( 0%) wall
49 kB ( 0%) ggc
tree loop bounds : 0.32 ( 0%) usr 0.01 ( 0%) sys 0.39 ( 0%) wall
0 kB ( 0%) ggc
loop invariant motion : 0.57 ( 0%) usr 0.01 ( 0%) sys 0.70 ( 0%) wall
0 kB ( 0%) ggc
tree canonical iv : 0.15 ( 0%) usr 0.01 ( 0%) sys 0.20 ( 0%) wall
0 kB ( 0%) ggc
scev constant prop : 1.47 ( 0%) usr 0.04 ( 0%) sys 1.87 ( 0%) wall
1973 kB ( 0%) ggc
complete unrolling : 0.07 ( 0%) usr 0.00 ( 0%) sys 0.07 ( 0%) wall
0 kB ( 0%) ggc
tree loop init : 5.14 ( 0%) usr 5.80 ( 4%) sys 13.36 ( 1%) wall
58726 kB ( 6%) ggc
tree loop fini : 0.01 ( 0%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall
0 kB ( 0%) ggc
tree copy headers : 0.24 ( 0%) usr 0.01 ( 0%) sys 0.31 ( 0%) wall
0 kB ( 0%) ggc
tree SSA uncprop : 0.43 ( 0%) usr 0.01 ( 0%) sys 0.54 ( 0%) wall
0 kB ( 0%) ggc
tree SSA to normal : 172.90 (12%) usr 1.50 ( 1%) sys 215.20 (11%) wall
92392 kB ( 9%) ggc
tree rename SSA copies: 0.60 ( 0%) usr 0.08 ( 0%) sys 0.78 ( 0%) wall
0 kB ( 0%) ggc
dominance frontiers : 0.53 ( 0%) usr 0.00 ( 0%) sys 0.64 ( 0%) wall
0 kB ( 0%) ggc
expand : 7.54 ( 1%) usr 4.20 ( 3%) sys 14.47 ( 1%) wall
129307 kB (13%) ggc
varconst : 0.01 ( 0%) usr 0.00 ( 0%) sys 0.00 ( 0%) wall
7 kB ( 0%) ggc
jump : 0.73 ( 0%) usr 0.03 ( 0%) sys 0.90 ( 0%) wall
0 kB ( 0%) ggc
CSE : 2.19 ( 0%) usr 1.67 ( 1%) sys 4.78 ( 0%) wall
2169 kB ( 0%) ggc
loop analysis : 1.69 ( 0%) usr 0.15 ( 0%) sys 2.25 ( 0%) wall
8645 kB ( 1%) ggc
branch prediction : 3.22 ( 0%) usr 0.22 ( 0%) sys 4.17 ( 0%) wall
5998 kB ( 1%) ggc
flow analysis : 0.21 ( 0%) usr 0.00 ( 0%) sys 0.27 ( 0%) wall
0 kB ( 0%) ggc
combiner : 4.03 ( 0%) usr 0.11 ( 0%) sys 5.07 ( 0%) wall
31600 kB ( 3%) ggc
if-conversion : 2.01 ( 0%) usr 0.11 ( 0%) sys 2.58 ( 0%) wall
344 kB ( 0%) ggc
local alloc : 2.87 ( 0%) usr 0.10 ( 0%) sys 3.63 ( 0%) wall
13500 kB ( 1%) ggc
global alloc : 25.97 ( 2%) usr 21.91 (17%) sys 57.82 ( 3%) wall
31337 kB ( 3%) ggc
reload CSE regs : 42.61 ( 3%) usr 0.54 ( 0%) sys 52.45 ( 3%) wall
12846 kB ( 1%) ggc
flow 2 : 0.66 ( 0%) usr 0.00 ( 0%) sys 0.82 ( 0%) wall
19 kB ( 0%) ggc
if-conversion 2 : 0.77 ( 0%) usr 0.06 ( 0%) sys 1.03 ( 0%) wall
14 kB ( 0%) ggc
rename registers : 0.95 ( 0%) usr 0.20 ( 0%) sys 1.37 ( 0%) wall
24 kB ( 0%) ggc
scheduling 2 : 3.51 ( 0%) usr 0.18 ( 0%) sys 4.47 ( 0%) wall
36103 kB ( 4%) ggc
shorten branches : 0.17 ( 0%) usr 0.00 ( 0%) sys 0.21 ( 0%) wall
0 kB ( 0%) ggc
final : 2.35 ( 0%) usr 0.14 ( 0%) sys 3.36 ( 0%) wall
4096 kB ( 0%) ggc
symout : 0.00 ( 0%) usr 0.00 ( 0%) sys 0.02 ( 0%) wall
0 kB ( 0%) ggc
TOTAL :1438.01 131.69 1949.05
979456 kB
So, this is a very large file (and only one C routine), but the times for the
various passes are very unbalanced; in particular the following three catch
anyone's eye:
tree operand scan : 628.65 (44%) usr 12.18 ( 9%) sys 814.05 (42%) wall
23896 kB ( 2%) ggc
dominator optimization: 307.01 (21%) usr 2.88 ( 2%) sys 380.36 (20%) wall
63887 kB ( 7%) ggc
tree SSA to normal : 172.90 (12%) usr 1.50 ( 1%) sys 215.20 (11%) wall
92392 kB ( 9%) ggc
I don't know what the compile times are with 4.2; perhaps people who have a
64-bit profiled gcc would like to investigate more what is going on.
--
Summary: Inordinate compile times on large routines
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: lucier at math dot purdue dot edu
GCC build triplet: powerpc-apple-darwin8.5.0
GCC host triplet: powerpc-apple-darwin8.5.0
GCC target triplet: powerpc-apple-darwin8.5.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26854
