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From: Simon Riggs <simon@2ndquadrant.com>
To: Jignesh K. Shah <J.K.Shah@Sun.COM>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Josh Berkus <josh@agliodbs.com>
Cc: pgsql-performance@postgresql.org
Cc: Alvaro Herrera <alvherre@commandprompt.com>
Subject: Re: User concurrency thresholding: where do I look?
Date: Thu, 26 Jul 2007 16:25:31 +0100
Message-ID: <1185463531.4190.72.camel@ebony.site> (raw)
In-Reply-To: <46A8AFDF.3050804@sun.com>
References: <200707190828.59088.josh@agliodbs.com>
	<200707191819.13899.josh@agliodbs.com>
	<15685.1184895926@sss.pgh.pa.us>
	<200707192138.39679.josh@agliodbs.com>
	<46A0FA31.2080208@sun.com>
	<12002.1184955831@sss.pgh.pa.us>
	<46A1055F.9010304@sun.com>
	<12445.1184958793@sss.pgh.pa.us>
	<46A11116.5030905@sun.com>
	<14909.1184962561@sss.pgh.pa.us>
	<46A1205B.8010205@sun.com>
	<15343.1184965054@sss.pgh.pa.us>
	<1185180668.4284.149.camel@ebony.site>
	<23848.1185199901@sss.pgh.pa.us>
	<1185201556.4284.243.camel@ebony.site>
	<25095.1185202498@sss.pgh.pa.us>
	<1185205663.4284.249.camel@ebony.site>
	<1185212261.4284.270.camel@ebony.site>
	<1545.1185214760@sss.pgh.pa.us>
	<46A7D5AD.9000706@sun.com>
	<13162.1185405865@sss.pgh.pa.us>
	<46A8AFDF.3050804@sun.com>

On Thu, 2007-07-26 at 10:29 -0400, Jignesh K. Shah wrote:
> The count is only for a 10-second snapshot.. Plus remember there are 
> about 1000 users running so the connection  being profiled only gets 
> 0.01 of the period on CPU..  And the count is for that CONNECTION only.

Is that for one process, or all processes aggregated in some way?

>  CheckpointStartLock          Shared               6
>  CheckpointStartLock       Exclusive             102

That's definitely whacked. Surely we didn't start 102 checkpoints yet
attempt to commit 6 times?
   
-- 
  Simon Riggs
  EnterpriseDB  http://www.enterprisedb.com

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