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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 27577.1185464568@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?
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"Jignesh K. Shah" <J.K.Shah@Sun.COM> writes:
> For  600-850 Users: that potential mislabeled CheckPointStartLock  or
> LockID==12 comes from various sources where the top source (while system
> is still doing great) comes from:

>               postgres`LWLockAcquire+0x1c8
>               postgres`SimpleLruReadPage_ReadOnly+0xc
>               postgres`TransactionIdGetStatus+0x14

That path would be taking CLogControlLock ... so you're off by at least
one.  Compare the script to src/include/storage/lwlock.h.

            regards, tom lane

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