Comments for SQLWorkshops.com Blog

Comment on Plan Caching and Query Memory Part 2: When not to use stored procedure or other plan caching mechanisms like sp_executesql or prepared statement by Basit Farooq

Basit Farooq — Thu, 19 Jul 2012 11:24:59 +0000

Thanks for this excellient post.

Comment on SQL Server IO handling mechanism can be severely affected by high CPU usage by R Meyyappan

R Meyyappan — Wed, 18 Jul 2012 15:59:54 +0000

Hello Kennie, thanks for your suggestion. Unfortunately, dedicating a single CPU only for IO using an affinity mask like you mention will not help solve this problem. Did you test it?

See comments from Randy Rabin and Marco Carozzi to the connect item: https://connect.microsoft.com/SQLServer/feedback/details/744650/sql-server-io-handling-mechanism-can-be-severely-affected-by-high-cpu-usage. Randy’s feedback: Setting CPU and I/O affinity masks to separate the different workloads onto different CPUs had no effect (I was hoping it would). Even with one CPU allocated to processing and 3 CPUs to I/O, there was still a big difference in query performance.

Regards
-ramesh-

Comment on SQL Server IO handling mechanism can be severely affected by high CPU usage by Kennie Nybo Pontoppidan

Kennie Nybo Pontoppidan — Mon, 04 Jun 2012 09:11:19 +0000

you could consider dedicating a single cpu only for IO using an affinity mask. I sat in a workshop in MOW2012 where Thomas Kejser described this very problem. You might want to consult him for the details

Best wishes,
Kennie