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From: Josh Berkus <josh@agliodbs.com>
To: Amit Kapila <amit.kapila@huawei.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Performance bug in prepared statement binding in 9.2?
Date: Thu, 01 Aug 2013 10:58:16 -0700
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Amit, All:

So we just retested this on 9.3b2.  The performance is the same as 9.1
and 9.2; that is, progressively worse as the test cycles go on, and
unacceptably slow compared to 8.4.

Some issue introduced in 9.1 is causing BINDs to get progressively
slower as the PARSEs BINDs get run repeatedly.  Per earlier on this
thread, that can bloat to 200X time required for a BIND, and it's
definitely PostgreSQL-side.

I'm trying to produce a test case which doesn't involve the user's
application.  However, hints on other things to analyze would be keen.

-- 
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com


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