On 09.03.2015 20:03, stan wrote: > I'm running Fedora 21 with a custom compiled kernel, > 3.19.0-1.20150211.fc21.x86_64. > > I have a multi core system with 6 cores. All are recognized by the > kernel. > > But, when I run a compile job with -j6, in order to allow all six cores > to be used, it limits the total amount of usage to 100% of a *single* > core. So, it might use all six cores, but the sum of the percentages > on those six cores is always around 100% of one core. This is from > htop output. > > On large compilations, like the kernel or firefox, even using 4 cores > could drastically reduce compile time. > > I've looked at /etc/security/limits.conf, but it doesn't seem to have a > setting for this. I've also looked at the /proc system to see if there > is a kernel variable, though that seems unlikely, with no luck. Online > searching found ways to limit the amount that a single job can get, but > not how to set this for a user. There must be a configuration variable > somewhere that is limiting the amount of total cpu a user can use. But > I can't find it. > > Can anyone help? >
Borislav, can you help explain the man why this is happening with his Piledriver. http://www.cpu-world.com/CPUs/Bulldozer/AMD-FX-Series%20FX-6300.html poma -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
