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Re: 8.4 open item: copy performance regression?

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc>
Cc: Greg Smith <gsmith(at)gregsmith(dot)com>, Andrew Dunstan <andrew(at)dunslane(dot)net>, Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Alan Li <ali(at)truviso(dot)com>
Subject: Re: 8.4 open item: copy performance regression?
Date: 2009-06-20 15:38:09
Message-ID: 4148.1245512289@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackers
Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc> writes:
>    and I believe I have seen the "more IO with 8.4" thing here too but I 
> have not actually paid enough attention yet to be sure.

FSM/VM overhead maybe?  I think COPY IN is setting the SKIP_FSM bit,
but I wonder if there's some vestigial overhead anyway.

			regards, tom lane

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