On Tue, Jul 5, 2011 at 8:37 AM, Charles R Harris <[email protected]>wrote:
> > > On Tue, Jul 5, 2011 at 8:13 AM, Neal Becker <[email protected]> wrote: > >> Charles R Harris wrote: >> >> > On Tue, Jul 5, 2011 at 7:45 AM, Neal Becker <[email protected]> >> wrote: >> > >> >> I thought I'd try to speed up numpy on my fedora system by rebuilding >> the >> >> atlas >> >> package so it would be tuned for my machine. But when I do: >> >> >> >> rpmbuild -ba -D 'enable_native_atlas 1' atlas.spec >> >> >> >> it fails with: >> >> >> >> res/zgemvN_5000_100 : VARIATION EXCEEDS TOLERENCE, RERUN WITH HIGHER >> REPS. >> >> >> >> A bit of googling has not revealed a solution. Any hints? >> >> >> >> >> >> >> > I've never seen that, OTOH, I haven't built ATLAS in the last few years. >> Do >> > you have all the power saving/frequency changing options turned off? >> What >> > version of ATLAS are you using? What CPU? >> > >> > Chuck >> >> Ah, hadn't tried turing off cpuspeed. Try again... nope same error. >> >> 2 cpus, each: >> model name : Intel(R) Core(TM)2 Duo CPU T7500 @ 2.20GHz >> stepping : 11 >> cpu MHz : 800.000 << that's what it says @idle >> > > You haven't got cpu frequency scaling under control. Linux? Depending on > the distro you can write to a file in /sys (for each cpu) or run a program > to make the setting, or click on a panel applet. Sometimes the scaling is > set in the bios also. Google is your friend here. I have > > $charris@f13 ~$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor > ondemand > > And what you want to see is performance instead of ondemand. > > Here's some good info <http://tinyurl.com/o8o7b>. Chuck
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