Rahul Nabar wrote: > On Wed, Aug 12, 2009 at 11:32 AM, Craig Tierney<craig.tier...@noaa.gov> wrote: >> What do you mean normally? I am running Centos 5.3 with 2.6.18-128.2.1 >> right now on a 448 node Nehalem cluster. I am so far happy with how things >> work. >> The original Centos 5.3 kernel, 2.6.18-128.1.10 had bugs in Nelahem support >> where nodes would just start randomly run slow. Upgrading the kernel >> fixed that. But that performance problem was either all or none, I don't >> recall >> it exhibiting itself in the way that Rahul described. >> > > I was trying another angle. Playing with the power profiles. Just > downloaded cpufreq-utils via yum. Tried to see what profile was > loaded: > > cpufreq-info > cpufrequtils 005: cpufreq-info (C) Dominik Brodowski 2004-2006 > Report errors and bugs to cpuf...@vger.kernel.org, please. > analyzing CPU 0: > no or unknown cpufreq driver is active on this CPU > analyzing CPU 1: > no or unknown cpufreq driver is active on this CPU > analyzing CPU 2: > no or unknown cpufreq driver is active on this CPU > analyzing CPU 3: > no or unknown cpufreq driver is active on this CPU > analyzing CPU 4: > no or unknown cpufreq driver is active on this CPU > analyzing CPU 5: > no or unknown cpufreq driver is active on this CPU > analyzing CPU 6: > no or unknown cpufreq driver is active on this CPU > analyzing CPU 7: > no or unknown cpufreq driver is active on this CPU > > Is this lack of the right drivers indicative of a deeper fault or is > this fairly local to this issue? This could be a clue or a red > herring. Just thought that I ought to post it. >
I read there are several different tools to manage the CPU frequency. If you are using Centos/Redhat try: cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors Does it list any? If not, that might be why cpufreq-info can't find anything. Craig -- Craig Tierney (craig.tier...@noaa.gov) _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
