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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Matthew Wakeling <matthew@flymine.org>
Cc: Scott Carey <scott@richrelevance.com>
Cc: Simon Riggs <simon@2ndQuadrant.com>
Cc: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Subject: Re: Proposal of tunable fix for scalability of 8.4
Date: Fri, 20 Mar 2009 11:55:45 -0400
Message-ID: <14217.1237564545@sss.pgh.pa.us> (raw)
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Matthew Wakeling <matthew@flymine.org> writes:
> As for ProcArrayLock, it sounds like it is very much a special case.

Quite.  Read the section "Interlocking Transaction Begin, Transaction
End, and Snapshots" in src/backend/access/transam/README before
proposing any changes in this area --- it's a lot more delicate than
one might think.  We'd have partitioned the ProcArray long ago if
it wouldn't have broken the transaction system.

			regards, tom lane

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