Am 08/18/11 12:08, schrieb James Broadhead:
> On 18 August 2011 09:23, Norman Rieß <[email protected]> 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
>
Well i use an Atom D510, the core features seems to be quite similar to
yours, with the only difference, that D510 has a graphics unit added.
Here is my make.conf... how many threads are you using in gcc?
CFLAGS="-O2 -pipe -march=core2 -mssse3 -mfpmath=sse"
CXXFLAGS="${CFLAGS}"
CHOST="x86_64-pc-linux-gnu"
MAKEOPTS="-j5"
USE="-X -gtk -gtk2 -qt3 -qt4 -gnome -kde unicode nls -mysql mmx sse sse2
ssse3 acpi hddtemp threads iproute2"
LINGUAS="de"
AUTOCLEAN="yes"
FEATURES="parallel-fetch"
Norman
