How long time does a context switch take in Linux (ubuntu 18.04)

Question

I'm interessted in getting the number of context switches a two processes in a KVM vm takes on a singel CPU over some time.

Earlier i have used perf, is this best practice?

And how much time is used on a context switch per CPU?

There are many publications about this topic. For example, Quantifying the cost of context switch. https://dl.acm.org/doi/abs/10.1145/1281700.1281702 — hakunami, Apr 30 '20 at 10:16

score 9 · Accepted Answer · answered Mar 15 '19 at 22:19

9

About 1.2 microseconds which is about a thousand Cycles

answered Mar 15 '19 at 22:19

user1133275

And most of that time is taken up by the Linux scheduler doing its work – JanKanis Jun 12 '20 at 06:29

1 Answers1