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South Africa
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Posted - 04/17/2013 :  09:29:51  Show Profile  Reply with Quote
Good Day,
We are running SQL Server 2008R2 Ent 64 bit with 32 CPUs and 256 gig of memory. We ran diagnostic scripts to identify any bottlenecks and found that ony 4 processors are relatively busy processing only between 4 and 7 processes each.

When I ran sp_who3 I noticed that the lastwaittype on some of the processes is SOS_SCHEDULER_YIELD , meaning the cpus are under pressure . Now I am baffled ,because the users also are not complaining . Any ideas ?


5072 Posts

Posted - 04/17/2013 :  12:25:28  Show Profile  Visit russell's Homepage  Reply with Quote
This is not necessarily an indication of CPU pressure.

What are you seeing in perfmon for % Processor time? Have a look at this blog and the Waits and Queues White Paper
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