Messages in this thread | | | Date | Mon, 07 Nov 2005 17:06:10 -0600 | From | Brian Twichell <> | Subject | Re: Database regression due to scheduler changes ? |
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David Lang wrote:
> If I am understanding the data you posted, it looks like you are > useing sched_yield extensivly in your database.
Yes, I've seen problems in the past with workloads that use sched_yield heavily.
But bear in mind, the ~2700 sched_yields shown in the schedstats occurred over a 9 minute period. That means that sched_yield is being called at a rate of around 5 per second -- this is not a heavy user of sched_yield.
To put this into a broader perspective, this workload has around 270 tasks, and the context switch rate is around 45,000 per second.
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