Hello,
I was searching for the best mcpu option for amcc440, compiling and running a small program you can find here:
http://magnux.free.fr/gcc/mandelbrot.c. My distro is a ppc fedora core 6, and results are obviously the same using DENX4.0.
--------------------
-bash-3.00# gcc -O2 ./mandelbrot.c -o ./mandelbrot && time ./mandelbrot && rm -f ./mandelbrot
real 1m15.059s
user 1m14.996s
sys 0m0.060s
-bash-3.00# gcc -O2 -mcpu=440 ./mandelbrot.c -o ./mandelbrot && time ./mandelbrot && rm -f ./mandelbrot
real 0m39.606s
user 0m39.552s
sys 0m0.028s
-bash-3.00# gcc -O2 -mcpu=440fp ./mandelbrot.c -o ./mandelbrot && time ./mandelbrot && rm -f ./mandelbrot
real 1m15.016s
user 1m14.988s
sys 0m0.024s
-bash-3.00# gcc -O2 -msoft-float ./mandelbrot.c -o ./mandelbrot && time ./mandelbrot && rm -f ./mandelbrot
real 0m39.577s
user 0m39.544s
sys 0m0.032s
--------------------
* I do not explain why not using FPU gives better results ?
* I did also a test with bzip2.c ( http://pag.csail.mit.edu/~smcc/projects/single-file-programs/bzip2.c ).
----------------------
-bash-3.00# gcc -O2 ./bzip2.c -o ./bzip2 && time ./bzip2 ./oggenc.c && ./bzip2 -d ./oggenc.c.bz2 && rm ./bzip2
real 0m18.478s
user 0m18.216s
sys 0m0.152s
-bash-3.00# gcc -O2 -mcpu=440 ./bzip2.c -o ./bzip2 && time ./bzip2 ./oggenc.c && ./bzip2 -d ./oggenc.c.bz2 && rm ./bzip2
real 0m18.786s
user 0m18.544s
sys 0m0.128s
-bash-3.00# gcc -O2 -mcpu=440fp ./bzip2.c -o ./bzip2 && time ./bzip2 ./oggenc.c && ./bzip2 -d ./oggenc.c.bz2 && rm ./bzip2
real 0m18.811s
user 0m18.548s
sys 0m0.144s
-bash-3.00# gcc -O2 -mcpu=G3 ./bzip2.c -o ./bzip2 && time ./bzip2 ./oggenc.c && ./bzip2 -d ./oggenc.c.bz2 && rm ./bzip2
real 0m18.871s
user 0m18.644s
sys 0m0.104s
----------------------
* mcpu option seems to not have any effect ?
* My third test was to compile and run mplayer.
- With default options (no mcpu specified), my test mpeg was smooth.
- With mcpu=440fp, my test mpeg was not smooth.
Can anybody bring me some lights about the right gcc mcpu option for amcc440 ?
Best regards,
Patrice Bouchand
---------------------------------
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FYI, I got the following answer on mplayer mailing list:
Apparently -mcpu=440fp is the one. However, it's possible, that GCC
"optimizations" actually make the code slower.
Can someone confirme this possiblity ?
Any answer would be greatly appreciated ;)
Patrice Bouchand
Hello,
I was searching for the best mcpu option for amcc440, compiling and
running a small program you can find here:
http://magnux.free.fr/gcc/mandelbrot.c. My distro is a ppc fedora core
6, and results are obviously the same using DENX4.0.
--------------------
-bash-3.00# gcc -O2 ./mandelbrot.c -o ./mandelbrot &&
time ./mandelbrot && rm -f ./mandelbrot
real 1m15.059s
user 1m14.996s
sys 0m0.060s
-bash-3.00# gcc -O2 -mcpu=440 ./mandelbrot.c -o ./mandelbrot &&
time ./mandelbrot && rm -f ./mandelbrot
real 0m39.606s
user 0m39.552s
sys 0m0.028s
-bash-3.00# gcc -O2 -mcpu=440fp ./mandelbrot.c -o ./mandelbrot &&
time ./mandelbrot && rm -f ./mandelbrot
real 1m15.016s
user 1m14.988s
sys 0m0.024s
-bash-3.00# gcc -O2 -msoft-float ./mandelbrot.c -o ./mandelbrot &&
time ./mandelbrot && rm -f ./mandelbrot
real 0m39.577s
user 0m39.544s
sys 0m0.032s
--------------------
* I do not explain why not using FPU gives better results ?
* I did also a test with bzip2.c
( http://pag.csail.mit.edu/~smcc/projects/single-file-programs/bzip2.c ).
----------------------
-bash-3.00# gcc -O2 ./bzip2.c -o ./bzip2 && time ./bzip2 ./oggenc.c
&& ./bzip2 -d ./oggenc.c.bz2 && rm ./bzip2
real 0m18.478s
user 0m18.216s
sys 0m0.152s
-bash-3.00# gcc -O2 -mcpu=440 ./bzip2.c -o ./bzip2 &&
time ./bzip2 ./oggenc.c && ./bzip2 -d ./oggenc.c.bz2 && rm ./bzip2
real 0m18.786s
user 0m18.544s
sys 0m0.128s
-bash-3.00# gcc -O2 -mcpu=440fp ./bzip2.c -o ./bzip2 &&
time ./bzip2 ./oggenc.c && ./bzip2 -d ./oggenc.c.bz2 && rm ./bzip2
real 0m18.811s
user 0m18.548s
sys 0m0.144s
-bash-3.00# gcc -O2 -mcpu=G3 ./bzip2.c -o ./bzip2 &&
time ./bzip2 ./oggenc.c && ./bzip2 -d ./oggenc.c.bz2 && rm ./bzip2
real 0m18.871s
user 0m18.644s
sys 0m0.104s
----------------------
* mcpu option seems to not have any effect ?
* My third test was to compile and run mplayer.
- With default options (no mcpu specified), my test mpeg was smooth.
- With mcpu=440fp, my test mpeg was not smooth.
Can anybody bring me some lights about the right gcc mcpu option for
amcc440 ?
Best regards,
Patrice Bouchand
______________________________________________________________________
Découvrez une nouvelle façon d'obtenir des réponses à toutes vos
questions ! Profitez des connaissances, des opinions et des
expériences des internautes sur Yahoo! Questions/Réponses.
_______________________________________________
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https://ozlabs.org/mailman/listinfo/linuxppc-embedded
Hi,
Have you tried using the -ffast-math option?
/Magnus
On Wed, 21 Feb 2007 20:47:50 +0100
Patrice Bouchand [off-list ref] wrote:
=20
FYI, I got the following answer on mplayer mailing list:
=20
quoted
Apparently -mcpu=3D440fp is the one. However, it's possible, that GCC
"optimizations" actually make the code slower.
=20
Can someone confirme this possiblity ?
=20
Any answer would be greatly appreciated ;)=20
=20
=20
Patrice Bouchand
=20
=20quoted
Hello,
=20
I was searching for the best mcpu option for amcc440, compiling and
running a small program you can find here:=20
http://magnux.free.fr/gcc/mandelbrot.c. My distro is a ppc fedora core
6, and results are obviously the same using DENX4.0.
=20
--------------------
-bash-3.00# gcc -O2 ./mandelbrot.c -o ./mandelbrot &&
time ./mandelbrot && rm -f ./mandelbrot
=20
real 1m15.059s
user 1m14.996s
sys 0m0.060s
-bash-3.00# gcc -O2 -mcpu=3D440 ./mandelbrot.c -o ./mandelbrot &&
time ./mandelbrot && rm -f ./mandelbrot
=20
real 0m39.606s
user 0m39.552s
sys 0m0.028s
-bash-3.00# gcc -O2 -mcpu=3D440fp ./mandelbrot.c -o ./mandelbrot &&
time ./mandelbrot && rm -f ./mandelbrot
=20
real 1m15.016s
user 1m14.988s
sys 0m0.024s
-bash-3.00# gcc -O2 -msoft-float ./mandelbrot.c -o ./mandelbrot &&
time ./mandelbrot && rm -f ./mandelbrot
=20
real 0m39.577s
user 0m39.544s
sys 0m0.032s
--------------------
=20
* I do not explain why not using FPU gives better results ?
=20
* I did also a test with bzip2.c
( http://pag.csail.mit.edu/~smcc/projects/single-file-programs/bzip2.c =
).
quoted
=20
----------------------
-bash-3.00# gcc -O2 ./bzip2.c -o ./bzip2 && time ./bzip2 ./oggenc.c
&& ./bzip2 -d ./oggenc.c.bz2 && rm ./bzip2
=20
real 0m18.478s
user 0m18.216s
sys 0m0.152s
-bash-3.00# gcc -O2 -mcpu=3D440 ./bzip2.c -o ./bzip2 &&
time ./bzip2 ./oggenc.c && ./bzip2 -d ./oggenc.c.bz2 && rm ./bzip2
=20
real 0m18.786s
user 0m18.544s
sys 0m0.128s
-bash-3.00# gcc -O2 -mcpu=3D440fp ./bzip2.c -o ./bzip2 &&
time ./bzip2 ./oggenc.c && ./bzip2 -d ./oggenc.c.bz2 && rm ./bzip2
=20
real 0m18.811s
user 0m18.548s
sys 0m0.144s
-bash-3.00# gcc -O2 -mcpu=3DG3 ./bzip2.c -o ./bzip2 &&
time ./bzip2 ./oggenc.c && ./bzip2 -d ./oggenc.c.bz2 && rm ./bzip2
=20
real 0m18.871s
user 0m18.644s
sys 0m0.104s
----------------------
=20
* mcpu option seems to not have any effect ?
=20
* My third test was to compile and run mplayer.
- With default options (no mcpu specified), my test mpeg was smooth.
- With mcpu=3D440fp, my test mpeg was not smooth.
=20
Can anybody bring me some lights about the right gcc mcpu option for
amcc440 ?
=20
Best regards,
=20
Patrice Bouchand
=20
=20
=20
=20
______________________________________________________________________
D=E9couvrez une nouvelle fa=E7on d'obtenir des r=E9ponses =E0 toutes vos
questions ! Profitez des connaissances, des opinions et des
exp=E9riences des internautes sur Yahoo! Questions/R=E9ponses.
_______________________________________________
Linuxppc-embedded mailing list
Linuxppc-embedded@ozlabs.org
https://ozlabs.org/mailman/listinfo/linuxppc-embedded
=20
_______________________________________________
Linuxppc-embedded mailing list
Linuxppc-embedded@ozlabs.org
https://ozlabs.org/mailman/listinfo/linuxppc-embedded
Thanks for your answer but unfortunately, it makes just the thing a bit slower:
-bash-3.00# gcc -O2 -mcpu=440fp -ffast-math ./mandelbrot.c -o ./mandelbrot && time ./mandelbrot && rm -f ./mandelbrot
real 1m17.901s
user 1m17.828s
sys 0m0.036s
-bash-3.00# gcc -O2 -mcpu=440 -ffast-math ./mandelbrot.c -o ./mandelbrot && time ./mandelbrot && rm -f ./mandelbrot
real 0m41.180s
user 0m41.116s
sys 0m0.040s
-bash-3.00# gcc -O2 -mcpu=G3 -ffast-math ./mandelbrot.c -o ./mandelbrot && time ./mandelbrot && rm -f ./mandelbrot
real 1m14.820s
user 1m14.760s
sys 0m0.044s
Magnus Hjorth [off-list ref] a écrit : Hi,
Have you tried using the -ffast-math option?
/Magnus
On Wed, 21 Feb 2007 20:47:50 +0100
Patrice Bouchand
wrote:
FYI, I got the following answer on mplayer mailing list:
quoted
Apparently -mcpu=440fp is the one. However, it's possible, that GCC
"optimizations" actually make the code slower.
Can someone confirme this possiblity ?
Any answer would be greatly appreciated ;)
Patrice Bouchand
quoted
Hello,
I was searching for the best mcpu option for amcc440, compiling and
running a small program you can find here:
http://magnux.free.fr/gcc/mandelbrot.c. My distro is a ppc fedora core
6, and results are obviously the same using DENX4.0.
--------------------
-bash-3.00# gcc -O2 ./mandelbrot.c -o ./mandelbrot &&
time ./mandelbrot && rm -f ./mandelbrot
real 1m15.059s
user 1m14.996s
sys 0m0.060s
-bash-3.00# gcc -O2 -mcpu=440 ./mandelbrot.c -o ./mandelbrot &&
time ./mandelbrot && rm -f ./mandelbrot
real 0m39.606s
user 0m39.552s
sys 0m0.028s
-bash-3.00# gcc -O2 -mcpu=440fp ./mandelbrot.c -o ./mandelbrot &&
time ./mandelbrot && rm -f ./mandelbrot
real 1m15.016s
user 1m14.988s
sys 0m0.024s
-bash-3.00# gcc -O2 -msoft-float ./mandelbrot.c -o ./mandelbrot &&
time ./mandelbrot && rm -f ./mandelbrot
real 0m39.577s
user 0m39.544s
sys 0m0.032s
--------------------
* I do not explain why not using FPU gives better results ?
* I did also a test with bzip2.c
( http://pag.csail.mit.edu/~smcc/projects/single-file-programs/bzip2.c ).
----------------------
-bash-3.00# gcc -O2 ./bzip2.c -o ./bzip2 && time ./bzip2 ./oggenc.c
&& ./bzip2 -d ./oggenc.c.bz2 && rm ./bzip2
real 0m18.478s
user 0m18.216s
sys 0m0.152s
-bash-3.00# gcc -O2 -mcpu=440 ./bzip2.c -o ./bzip2 &&
time ./bzip2 ./oggenc.c && ./bzip2 -d ./oggenc.c.bz2 && rm ./bzip2
real 0m18.786s
user 0m18.544s
sys 0m0.128s
-bash-3.00# gcc -O2 -mcpu=440fp ./bzip2.c -o ./bzip2 &&
time ./bzip2 ./oggenc.c && ./bzip2 -d ./oggenc.c.bz2 && rm ./bzip2
real 0m18.811s
user 0m18.548s
sys 0m0.144s
-bash-3.00# gcc -O2 -mcpu=G3 ./bzip2.c -o ./bzip2 &&
time ./bzip2 ./oggenc.c && ./bzip2 -d ./oggenc.c.bz2 && rm ./bzip2
real 0m18.871s
user 0m18.644s
sys 0m0.104s
----------------------
* mcpu option seems to not have any effect ?
* My third test was to compile and run mplayer.
- With default options (no mcpu specified), my test mpeg was smooth.
- With mcpu=440fp, my test mpeg was not smooth.
Can anybody bring me some lights about the right gcc mcpu option for
amcc440 ?
Best regards,
Patrice Bouchand
______________________________________________________________________
Découvrez une nouvelle façon d'obtenir des réponses à toutes vos
questions ! Profitez des connaissances, des opinions et des
expériences des internautes sur Yahoo! Questions/Réponses.
_______________________________________________
Linuxppc-embedded mailing list
Linuxppc-embedded@ozlabs.org
https://ozlabs.org/mailman/listinfo/linuxppc-embedded
_______________________________________________
Linuxppc-embedded mailing list
Linuxppc-embedded@ozlabs.org
https://ozlabs.org/mailman/listinfo/linuxppc-embedded
---------------------------------
Découvrez une nouvelle façon d'obtenir des réponses à toutes vos questions ! Profitez des connaissances, des opinions et des expériences des internautes sur Yahoo! Questions/Réponses.