From: "Greg Sabino Mullane" <greg@turnstep.com>
To: pgsql-interfaces@postgresql.org
Subject: Re: DBD::Pg performance bites compared to DBD::mysql?
In-Reply-To: <87ekbhk05w.fsf@stark.xeocode.com>
Date: Tue, 14 Jun 2005 03:04:03 -0000
Message-ID: <933399e2f40b843429889b52d6ebae8d@biglumber.com>


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>> the above trace only shows a factor of 2 total penalty, but I've
>> seen up to a factor of 4 in other cases.  There is no way that a
>> client-side driver should be taking several times longer than the
>> backend to process a SQL command :-(

> What version of DBD::Pg did you test with?

This is a problem with the newer versions as well. Maybe even worse,
as we had to do some contortions when the PQprepare 7.4/8.0 mess
appeared. However, we can definitely speed up that part of the code.
I'll see about doing this soon.

I still maintain the original test is brain-dead, however. :) It was
testing for "insert speed" by basically doing this:

for (1..1000) {
        $dbh->do("INSERT INTO testtable(a,b) VALUES (1,2)");
}

It's as if the people who wrote it *cough*mysql*cough* never heard
of prepare/execute and did not read the DBI docs.

It's very similar to the script on this page:

http://www.innodb.com/bench.php


- --
Greg Sabino Mullane greg@turnstep.com
PGP Key: 0x14964AC8 200506121438
http://biglumber.com/x/web?pk=2529DF6AB8F79407E94445B4BC9B906714964AC8
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