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Re: [Qemu-discuss] Reducing guest cpu usage

From: Jakob Bohm
Subject: Re: [Qemu-discuss] Reducing guest cpu usage
Date: Thu, 29 Dec 2016 16:34:19 +0100
User-agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1

On 29/12/2016 07:26, Programmingkid wrote:
There is a program that I run inside of QEMU that doesn't use the virtual CPU very efficiently. It causes QEMU to use 100% of the guest's CPU time. I was wondering if there were a way to reduce the amount of host CPU time that a guest CPU can use? This feature would help prevent laptops from heating up when running QEMU.
Your best option seems to be to lower the priority (with the nice or
renice command) of qemu and its kvm child process.  It seems that the
ulimit/prlimit/setrlimit calls on Linux, despite their versatility,
do not provide a setting that gently limits the amount of CPU the
scheduler grants to a process.

Of course lowering process priority by increasing its nice value only
reduces how much it takes away from other active processes, it cannot
cause the CPU to become idle when the nice process says it has work
to do.


Jakob Bohm, CIO, Partner, WiseMo A/S.  https://www.wisemo.com
Transformervej 29, 2860 Søborg, Denmark.  Direct +45 31 13 16 10
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