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Re: User concurrency thresholding: where do I look?

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Jignesh K(dot) Shah" <J(dot)K(dot)Shah(at)Sun(dot)COM>
Cc: Josh Berkus <josh(at)agliodbs(dot)com>, pgsql-performance(at)postgresql(dot)org, Alvaro Herrera <alvherre(at)commandprompt(dot)com>
Subject: Re: User concurrency thresholding: where do I look?
Date: 2007-07-20 18:23:51
Message-ID: 12002.1184955831@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-performance
"Jignesh K. Shah" <J(dot)K(dot)Shah(at)Sun(dot)COM> writes:
> There are no hard failures reported anywhere. Log min durations does 
> show that queries are now slowing down and taking longer.
> OS is not swapping and also eliminated IO  by putting the whole database 
> on /tmp

Hmm.  Do you see any evidence of a context swap storm (ie, a drastic
increase in the context swaps/second reading reported by vmstat)?

			regards, tom lane

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