Messages in this thread | | | Date | Thu, 04 Jun 2009 15:19:22 +0300 | From | Avi Kivity <> | Subject | Re: [RFC] CPU hard limits |
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Bharata B Rao wrote: > 2. Need for hard limiting CPU resource > -------------------------------------- > - Pay-per-use: In enterprise systems that cater to multiple clients/customers > where a customer demands a certain share of CPU resources and pays only > that, CPU hard limits will be useful to hard limit the customer's job > to consume only the specified amount of CPU resource. > - In container based virtualization environments running multiple containers, > hard limits will be useful to ensure a container doesn't exceed its > CPU entitlement. > - Hard limits can be used to provide guarantees. > How can hard limits provide guarantees?
Let's take an example where I have 1 group that I wish to guarantee a 20% share of the cpu, and anther 8 groups with no limits or guarantees.
One way to achieve the guarantee is to hard limit each of the 8 other groups to 10%; the sum total of the limits is 80%, leaving 20% for the guarantee group. The downside is the arbitrary limit imposed on the other groups.
Another way is to place the 8 groups in a container group, and limit that to 80%. But that doesn't work if I want to provide guarantees to several groups.
-- error compiling committee.c: too many arguments to function
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