Re: POSIX regex performance bug in 7.3 Vs. 7.2

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: wade <wade(at)wavefire(dot)com>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: POSIX regex performance bug in 7.3 Vs. 7.2
Date: 2003-02-03 22:51:28
Message-ID: 12950.1044312688@sss.pgh.pa.us
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wade <wade(at)wavefire(dot)com> writes:
> Here is the profile information. I included a log of the session that
> generated it at the top of the gprof output. If there is any other info I
> can help you with, please let me know.

A four-second test isn't long enough to gather any statistically
meaningful profile info. On most machines, gprof samples 100 times per
second, so realistically you need a minute or two of runtime to have
trustworthy numbers.

Please replicate the rows in the table by a factor of ten or twenty or
so and try again.

regards, tom lane

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