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From: Christopher Browne <cbbrowne@acm.org>
To: pgsql-performance@postgresql.org
Subject: Re: New to PostgreSQL, performance considerations
Date: Mon, 11 Dec 2006 22:27:46 -0500
Message-ID: <87mz5tn68d.fsf@wolfe.cbbrowne.com> (raw)
References: <430d92a20612101336r3de8862coe618277fccb4006a@mail.gmail.com>
	<8a0c7af10612101702i49b5a533v4a2300d90d9dae6b@mail.gmail.com>
	<20061211021847.GE16692@mathom.us>
	<8a0c7af10612110305u305124b2v3d63491b5f57a86b@mail.gmail.com>
	<87u002mv49.fsf@wolfe.cbbrowne.com>
	<8a0c7af10612110531sbb019ck259fb16d131fdb50@mail.gmail.com>
	<60psaq5t94.fsf@dba2.int.libertyrms.com>
	<E1GtolA-0008Fk-4R@elasmtp-banded.atl.sa.earthlink.net>
	<20061211173105.GH16692@mathom.us>

After a long battle with technology, mstone+postgres@mathom.us (Michael Stone), an earthling, wrote:
> [1] I will say that I have never seen a realistic benchmark of
> general code where the compiler flags made a statistically
> significant difference in the runtime.

When we were initially trying out PostgreSQL on AIX, I did some
(limited, admittedly) comparisons between behaviour when compiled
using GCC 3.something, VisualAge C, and VisualAge C++.  I did some
modifications of -O values; I didn't find differences amounting to
more than a percent or two between any of the combinations.

If there's to be a difference, anywhere, it ought to have figured
pretty prominently between a pretty elderly GCC version and IBM's top
of the line PowerPC compiler.
-- 
output = reverse("gro.mca" "@" "enworbbc")
http://cbbrowne.com/info/linuxdistributions.html
"I  doubt this language  difference would  confuse anybody  unless you
were providing instructions on the insertion of a caffeine enema."
-- On alt.coffee



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