[Beowulf] cpufreq, multiple cores, load

Hearns, John john.hearns at mclaren.com
Wed Mar 10 04:46:33 EST 2010


> >
> You can change that schedular behaviour by twiddling 
> sched_mc_power_savings
> 
> echo 1 > /sys/devices/system/cpu/sched_mc_power_savings
> 
> 
> http://www.lesswatts.org/tips/cpu.php
> 

Sorry to set off at a slight tangent - on a related matter, does anyone
have a good writeup on the CPU scaling controls in Linux for Nehalem -
ie controlling TurboBoost.
Yes, I have Googled but as above someone here normally had a blindlingly
good resource.

The reason I ask is that we have some Nehalem boxes, which will
principally run a serial application.
Could be useful to see what effect turning on turboboost has.
I also saw there is a Gnome taskbar applet for showing CPU frequencies -
anyone got recommendations for a good monitor for that sort of thing?
Gkrellem springs to mind.

John Hearns
McLaren Racing


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