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Re: User concurrency thresholding: where do I look? - Mailing list pgsql-performance

From Tom Lane
Subject Re: User concurrency thresholding: where do I look?
Date
Msg-id 12445.1184958793@sss.pgh.pa.us
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In response to Re: User concurrency thresholding: where do I look?  ("Jignesh K. Shah" <J.K.Shah@Sun.COM>)
Responses Re: User concurrency thresholding: where do I look?  ("Jignesh K. Shah" <J.K.Shah@Sun.COM>)
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"Jignesh K. Shah" <J.K.Shah@Sun.COM> writes:
> Yes I did see increase in context switches and CPU migrations at that
> point using mpstat.

So follow that up --- try to determine which lock is being contended
for.  There's some very crude code in the sources that you can enable
with -DLWLOCK_STATS, but probably DTrace would be a better tool.

            regards, tom lane

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