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.
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