From: Florian Weimer <fweimer@bfk.de>
To: Cosimo Streppone <cosimo@streppone.it>
Cc: Postgresql Performance list <pgsql-performance@postgresql.org>
Subject: Re: New to PostgreSQL, performance considerations
Date: Tue, 12 Dec 2006 16:17:27 +0100
Message-ID: <82psapuos8.fsf@mid.bfk.de> (raw)
In-Reply-To: <457EA39E.1020207@streppone.it>
References: <C1A31C39.15548%llonergan@greenplum.com>
<457EA39E.1020207@streppone.it>
* Cosimo Streppone:
> "-O0" ~ 957 tps
> "-O1 -mcpu=pentium4 -mtune=pentium4" ~ 1186 tps
> "-O2 -mcpu=pentium4 -mtune=pentium4" ~ 1229 tps
> "-O3 -mcpu=pentium4 -mtune=pentium4" ~ 1257 tps
> "-O6 -mcpu=pentium4 -mtune=pentium4" ~ 1254 tps
-mcpu and -mtune are synonymous. You really should -march here (but
the result is non-generic code). Keep in mind that GCC does not
contain an instruction scheduler for the Pentium 4s. I also believe
that the GCC switches are not fine-grained enough to cover the various
Pentium 4 variants. For instance, some chips don't like the CMOV
instruction at all, but others can process it with decent speed.
--
Florian Weimer <fweimer@bfk.de>
BFK edv-consulting GmbH http://www.bfk.de/
Kriegsstraße 100 tel: +49-721-96201-1
D-76133 Karlsruhe fax: +49-721-96201-99
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To: pgsql-performance@postgresql.org
Cc: fweimer@bfk.de, cosimo@streppone.it
Subject: Re: New to PostgreSQL, performance considerations
In-Reply-To: <82psapuos8.fsf@mid.bfk.de>
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