Kon Lovett wrote:
Hi,
Attached are Chicken benchmark results for a -Os & a -O3 build of
the same Chicken source.
Well, YMMV seems to be the overall picture for the benchmarks. The
reduction in binary size is ~10%.
Apple's XCode, their buildtool, uses -Os as the default release
optimization flag, & they should know :-).
They should know what? Your benchmarks indicate that -O3 is a hair
faster than -Os. As you said above, the -Os binaries are a hair
smaller. What do people value, things being a hair faster or a hair
smaller? I do know that 10% size reductions don't sell anything,
whereas little improvements in performance can edge out competitors in
Shootout benchmarks.
There is of course the entire matrix of all versions of GCC on all OSes
and all CPUs with all the various possible compiler flags. Are there
any portions of that search space that show significant differences?
I'm not going to get into it, it's a lot of work. I learned back at
DEC that you have to spend most of your time coding, not benchmarking.
All an optimization jock ever does is develop heuristics about what
really improves the speed of code, and then occasionally check that his
assumptions are valid.
Cheers,
Brandon Van Every
./csc benchmarks/cscbench.scm -o benchmarks/cscbench -compiler ./chicken
cd benchmarks; ./cscbench
___| | _) |
| __ \ | __| | / _ \ __ \
| | | | | ( < __/ | |
\____|_| |_|_|\___|_|\_\\___|_| _|
Version 2, Build 429 - macosx-unix-gnu-ppc - [ libffi dload ptables applyhook ]
(c)2000-2006 Felix L. Winkelmann
CC:
Using built-in specs.
Target: powerpc-apple-darwin8
Configured with: /private/var/tmp/gcc/gcc-5363.obj~28/src/configure --disable-checking -enable-werror --prefix=/usr --mandir=/share/man --enable-languages=c,objc,c++,obj-c++ --program-transform-name=/^[cg][^.-]*$/s/$/-4.0/ --with-gxx-include-dir=/include/c++/4.0.0 --with-slibdir=/usr/lib --build=powerpc-apple-darwin8 --host=powerpc-apple-darwin8 --target=powerpc-apple-darwin8
Thread model: posix
gcc version 4.0.1 (Apple Computer, Inc. build 5363)
CFLAGS:
-DHAVE_CHICKEN_CONFIG_H -Os -mcpu=7450 -mtune=G4 -fomit-frame-pointer -fno-strict-aliasing -Wall -Wno-unused -Wno-uninitialized -DHAVE_ALLOCA_H -DC_ENABLE_PTABLES -no-cpp-precomp -DC_NO_PIC_NO_DLL
base unsafe max
boyer 0.276 0.180 0.189
browse 0.284 0.201 0.194
conform 0.554 0.250 0.239
cpstak 1.494 1.246 0.844
ctak 0.932 0.787 0.755
dderiv 0.475 0.372 0.343
deriv 0.373 0.302 0.281
destructive 0.482 0.446 0.235
div-iter 0.121 0.083 0.008
div-rec 0.301 0.172 0.175
dynamic 0.343 0.024 0.232
earley 0.068 0.068 0.052
fft 0.120 0.116
fib 0.814 0.065 0.104
fibc 10.052 6.067 4.166
fprint 0.005 0.005 0.005
fread 0.025 0.024 0.023
hanoi 2.148 1.997 0.405
lattice 27.379 20.294 20.092
maze 0.713 0.416
nqueens 0.011 0.009 0.004
puzzle 0.252 0.199 0.136
scheme 0.081 0.005 0.046
tak 1.504 1.028 0.239
takl 0.849 0.181 0.181
takr 2.802 1.766 1.389
traverse 1.715 0.814 0.843
travinit 0.247 0.192 0.067
triangl 3.215 2.258 2.046
-rwxr-xr-x 1 klovett admin 1487092 Sep 7 07:08 /usr/local/bin/chicken*
-rwxr-xr-x 1 klovett admin 42164 Sep 7 07:08 /usr/local/bin/chicken-profile*
-rwxr-xr-x 1 klovett admin 401748 Sep 7 07:08 /usr/local/bin/chicken-setup*
-rwxr-xr-x 1 klovett admin 3325776 Sep 7 07:08 /usr/local/bin/chicken-static*
-rwxr-xr-x 1 klovett admin 2677716 Sep 7 07:08 /usr/local/lib/libchicken.0.0.0.dylib*
lrwxr-xr-x 1 klovett admin 22 Sep 7 07:08 /usr/local/lib/libchicken.0.dylib@ -> libchicken.0.0.0.dylib
-rw-r--r-- 1 klovett admin 4225368 Sep 7 07:08 /usr/local/lib/libchicken.a
lrwxr-xr-x 1 klovett admin 22 Sep 7 07:08 /usr/local/lib/libchicken.dylib@ -> libchicken.0.0.0.dylib
-rwxr-xr-x 1 klovett admin 879 Sep 7 07:08 /usr/local/lib/libchicken.la*
-rwxr-xr-x 1 klovett admin 2373856 Sep 7 07:08 /usr/local/lib/libuchicken.0.0.0.dylib*
lrwxr-xr-x 1 klovett admin 23 Sep 7 07:08 /usr/local/lib/libuchicken.0.dylib@ -> libuchicken.0.0.0.dylib
-rw-r--r-- 1 klovett admin 3699712 Sep 7 07:08 /usr/local/lib/libuchicken.a
lrwxr-xr-x 1 klovett admin 23 Sep 7 07:08 /usr/local/lib/libuchicken.dylib@ -> libuchicken.0.0.0.dylib
-rwxr-xr-x 1 klovett admin 886 Sep 7 07:08 /usr/local/lib/libuchicken.la*
./csc benchmarks/cscbench.scm -o benchmarks/cscbench -compiler ./chicken
cd benchmarks; ./cscbench
___| | _) |
| __ \ | __| | / _ \ __ \
| | | | | ( < __/ | |
\____|_| |_|_|\___|_|\_\\___|_| _|
Version 2, Build 429 - macosx-unix-gnu-ppc - [ libffi dload ptables applyhook ]
(c)2000-2006 Felix L. Winkelmann
CC:
Using built-in specs.
Target: powerpc-apple-darwin8
Configured with: /private/var/tmp/gcc/gcc-5363.obj~28/src/configure --disable-checking -enable-werror --prefix=/usr --mandir=/share/man --enable-languages=c,objc,c++,obj-c++ --program-transform-name=/^[cg][^.-]*$/s/$/-4.0/ --with-gxx-include-dir=/include/c++/4.0.0 --with-slibdir=/usr/lib --build=powerpc-apple-darwin8 --host=powerpc-apple-darwin8 --target=powerpc-apple-darwin8
Thread model: posix
gcc version 4.0.1 (Apple Computer, Inc. build 5363)
CFLAGS:
-DHAVE_CHICKEN_CONFIG_H -O3 -mcpu=7450 -mtune=G4 -fomit-frame-pointer -fno-strict-aliasing -Wall -Wno-unused -Wno-uninitialized -DHAVE_ALLOCA_H -DC_ENABLE_PTABLES -no-cpp-precomp -DC_NO_PIC_NO_DLL
base unsafe max
boyer 0.261 0.181 0.176
browse 0.257 0.188 0.188
conform 0.053 0.223 0.246
cpstak 1.445 1.266 0.859
ctak 0.894 0.787 0.757
dderiv 0.463 0.332 0.359
deriv 0.336 0.268 0.252
destructive 0.480 0.444 0.242
div-iter 0.122 0.081 0.082
div-rec 0.289 0.179 0.177
dynamic 0.324 0.241 0.230
earley 0.072 0.060 0.053
fft 0.119 0.111
fib 0.819 0.635 0.104
fibc 9.536 6.176 4.199
fprint 0.005 0.004 0.005
fread 0.025 0.023 0.022
hanoi 2.154 2.016 0.405
lattice 26.856 20.028 20.278
maze 0.654 0.408
nqueens 0.011 0.009 0.004
puzzle 0.254 0.196 0.131
scheme 0.075 0.052 0.047
tak 1.465 1.247 0.238
takl 0.771 0.180 0.018
takr 2.753 1.728 1.395
traverse 1.631 0.848 0.859
travinit 0.257 0.197 0.070
triangl 3.040 2.260 1.834
-rwxr-xr-x 1 klovett admin 1552628 Sep 4 08:03 /usr/local/bin/chicken*
-rwxr-xr-x 1 klovett admin 42164 Sep 4 08:03 /usr/local/bin/chicken-profile*
-rwxr-xr-x 1 klovett admin 414036 Sep 4 08:03 /usr/local/bin/chicken-setup*
-rwxr-xr-x 1 klovett admin 3559588 Sep 4 08:03 /usr/local/bin/chicken-static*
-rwxr-xr-x 1 klovett admin 2891388 Sep 4 08:03 /usr/local/lib/libchicken.0.0.0.dylib*
lrwxr-xr-x 1 klovett admin 22 Sep 4 08:03 /usr/local/lib/libchicken.0.dylib@ -> libchicken.0.0.0.dylib
-rw-r--r-- 1 klovett admin 4581944 Sep 4 08:03 /usr/local/lib/libchicken.a
lrwxr-xr-x 1 klovett admin 22 Sep 4 08:03 /usr/local/lib/libchicken.dylib@ -> libchicken.0.0.0.dylib
-rwxr-xr-x 1 klovett admin 879 Sep 4 08:03 /usr/local/lib/libchicken.la*
-rwxr-xr-x 1 klovett admin 2602992 Sep 4 08:03 /usr/local/lib/libuchicken.0.0.0.dylib*
lrwxr-xr-x 1 klovett admin 23 Sep 4 08:03 /usr/local/lib/libuchicken.0.dylib@ -> libuchicken.0.0.0.dylib
-rw-r--r-- 1 klovett admin 4087824 Sep 4 08:03 /usr/local/lib/libuchicken.a
lrwxr-xr-x 1 klovett admin 23 Sep 4 08:03 /usr/local/lib/libuchicken.dylib@ -> libuchicken.0.0.0.dylib
-rwxr-xr-x 1 klovett admin 886 Sep 4 08:03 /usr/local/lib/libuchicken.la*
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