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From: Robert Lor <Robert.Lor@Sun.COM>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Jignesh K. Shah <J.K.Shah@Sun.COM>
Cc: Simon Riggs <simon@2ndquadrant.com>
Cc: Josh Berkus <josh@agliodbs.com>
Cc: pgsql-performance@postgresql.org, Alvaro Herrera <alvherre@commandprompt.com>
Subject: Re: User concurrency thresholding: where do I look?
Date: Thu, 26 Jul 2007 14:56:08 -0500
Message-ID: <46A8FC58.7060301@sun.com> (raw)
In-Reply-To: <27577.1185464568@sss.pgh.pa.us>
References: <200707190828.59088.josh@agliodbs.com>
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	<15685.1184895926@sss.pgh.pa.us>
	<200707192138.39679.josh@agliodbs.com>
	<46A0FA31.2080208@sun.com>
	<12002.1184955831@sss.pgh.pa.us>
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	<1185180668.4284.149.camel@ebony.site>
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	<1185201556.4284.243.camel@ebony.site>
	<25095.1185202498@sss.pgh.pa.us>
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	<1545.1185214760@sss.pgh.pa.us>
	<46A7D5AD.9000706@sun.com>
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	<46A8AFDF.3050804@sun.com>
	<26825.1185460816@sss.pgh.pa.us>
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	<27577.1185464568@sss.pgh.pa.us>

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

Indeed, the indexing was off by one due to the removal of 
BuffMappingLock in src/include/storage/lwlock.h between 8.1 and 8.2 
which was not updated in the DTrace script.

Thanks,
Robert

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