Re: Database regression due to scheduler changes ?

[Brian Twichell <tbrian@us.ibm.com>]

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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