On 18 August 2011 09:23, Norman Rieß <nor...@smash-net.org> wrote:
> Am 08/18/11 09:11, schrieb Matthew Finkel:
>> Just out of curiosity, how long does it take to compile gcc?
>>
>> - Matt
>
> Atom:
>
> genlop -t sys-devel/gcc-4.4.5
> * sys-devel/gcc
>
> Sat Feb 26 13:06:08 2011 >>> sys-devel/gcc-4.4.5
> merge time: 1 hour, 12 minutes and 27 seconds.
>
> Wed Mar 23 23:01:12 2011 >>> sys-devel/gcc-4.4.5
> merge time: 1 hour, 10 minutes and 22 seconds.
I have an Atom 330 machine which is getting significantly worse
build-times than you. What make.conf options are you using? (Or are
you using something else to improve build times?)
Wed Mar 16 04:49:09 2011 >>> sys-devel/gcc-4.4.5
merge time: 2 hours, 56 minutes and 20 seconds.
Thu May 5 22:07:36 2011 >>> sys-devel/gcc-4.3.4
merge time: 2 hours, 14 minutes and 15 seconds.
Fri May 6 00:35:53 2011 >>> sys-devel/gcc-4.4.5
merge time: 2 hours, 28 minutes and 17 seconds.
Admittedly, my machine runs xbmc, which is a resource hog, and has a
fair bit of disk activity.
My CFLAGS are:
CFLAGS="-O2 -march=core2 -mtune=generic -fomit-frame-pointer -pipe
-mssse3 -mfpmath=sse"
which date to before -march=atom, and having read a performance
article suggesting these. I note that the only practical difference
between the resultant gcc options is that setting -mtune to core2 adds
"#define __tune_core2__ 1". I wonder what the practical difference is.
echo | gcc -dM -E - -O2 -march=core2 -mtune=generic
-fomit-frame-pointer -pipe -mssse3 -mfpmath=sse
I suppose, having looked into it this far, I'll merge gcc-4.5 to see
what effect -mtune=atom has.
(I'm not particularly interested in build times, but whether they're a
sign of poor overall performance ... )
JB
