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Date: Sat, 8 Jul 2006 14:13:05 -0700
From: "Richard Fish" <bigfish@asmallpond.org>
Sender: richard.j.fish@gmail.com
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] Per-process CPU % usage limit
In-Reply-To: <200607081740.01670.shrdlu@unlimitedmail.org>
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On 7/8/06, Etaoin Shrdlu <shrdlu@unlimitedmail.org> wrote:
> The problem is that some very CPU-consuming apps, even if started with
> the lowest priority (eg, nice -n 19), still eat up 100% CPU (with
> subsequent overheating, fan start, throttling, etc.) if the system is
> not busy and has nothing else to do. What I'd like to know is whether it
> is possible to impose such a CPU percentage usage limit.
Well, I would first upgrade my cooling fans so the processor couldn't
overheat! :-)
But you could also enable "CPU freqency scaling" in the kernel, with
the ondemand governor, and use the various settings in
/sys/devices/system/cpu/cpu0/cpufreq to control the clock speed and
behavior of the system. You can use scaling_max_freq to specify the
maximum frequency of the processor so that it will not overheat or
throttle, no matter what the load is, and the
ondemand/ignore_nice_load setting will tell the governor not to
increase the clock speed for niced processes.
-Richard
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