Re: RESOLVED: Re: Wierd context-switching issue on Xeon - Mailing list pgsql-performance

From Dirk Lutzebäck
Subject Re: RESOLVED: Re: Wierd context-switching issue on Xeon
Date
Msg-id 40837F7D.9050102@aeccom.com
Whole thread Raw
In response to Re: RESOLVED: Re: Wierd context-switching issue on Xeon  (Josh Berkus <josh@agliodbs.com>)
List pgsql-performance
Josh, I cannot reproduce the excessive semop() on a Dual XEON DP on a
non-bigmem kernel, HT on. Interesting to know if the problem is related
to XEON MP (as Tom wrote) or bigmem.

Josh Berkus wrote:

>Dirk,
>
>
>
>>I'm not sure if this semop() problem is still an issue but the database
>>behaves a bit out of bounds in this situation, i.e. consuming system
>>resources with semop() calls 95% while tables are locked very often and
>>longer.
>>
>>
>
>It would be helpful to us if you could test this with the indexes disabled on
>the non-Bigmem system.   I'd like to eliminate Bigmem as a factor, if
>possible.
>
>
>



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