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Re: vzctl set cpuunits and vzcpucheck strange behaviour [message #42468 is a reply to message #38680]

Wed, 20 April 2011 11:11

davidh
Messages: 1
Registered: April 2011

Junior Member

The answer is simple. There is some magic number 500.000 in the code which is used to round numbers. I found the origin here: wiki.openvz.org/Fairsched_API#CPU_limit

So I found my vzcpucheck value of 479343 and I want every vz container to have 1/7 of the cpu time == 68477. When I enter this with vzctl I get 71428 as the value which is set.

Here is how the 500.000 number works: 500.000/71428 is an int! The next best lower number is 62500 cpuunits. When I enter that 7 times I get underbooking (which is what I want).

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[Message index]

		vzctl set cpuunits and vzcpucheck strange behaviour By: Paparaciz on Thu, 14 January 2010 21:14
		Re: vzctl set cpuunits and vzcpucheck strange behaviour By: dedicados on Fri, 15 January 2010 03:03
		Re: vzctl set cpuunits and vzcpucheck strange behaviour By: Paparaciz on Fri, 15 January 2010 07:24
		Re: vzctl set cpuunits and vzcpucheck strange behaviour By: davidh on Wed, 20 April 2011 11:11

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