* Avi Kivity <avi@xxxxxxxxxx> [2009-06-04 15:19:22]: > 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. > Hi, Avi, Take a look at http://wiki.openvz.org/Containers/Guarantees_for_resources and the associated program in the wiki page. -- Balbir -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
