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Re: Parallel pg_dump for 9.1

From: Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc>
To: Peter Eisentraut <peter_e(at)gmx(dot)net>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Josh Berkus <josh(at)agliodbs(dot)com>, Joachim Wieland <joe(at)mcknight(dot)de>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Parallel pg_dump for 9.1
Date: 2010-03-30 12:15:34
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Lists: pgsql-hackers
Peter Eisentraut wrote:
> On tis, 2010-03-30 at 08:39 +0200, Stefan Kaltenbrunner wrote:
>> on fast systems pg_dump is completely CPU bottlenecked 
> Might be useful to profile why that is.  I don't think pg_dump has
> historically been developed with CPU efficiency in mind.

It's not pg_dump that is the problem - it is COPY that is the limit. In 
my specific case als the fact that a lot of the columns are bytea adds 
to the horrible CPU overhead (fixed in 9.0). Still our bulk load & 
unload performance is still way slower on a per core comparision than a 
lot of other databases :(


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