From: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com> |
---|---|
To: | Luke Lonergan <llonergan(at)greenplum(dot)com> |
Cc: | Naz Gassiep <naz(at)mira(dot)net>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: PostgreSQL on 64 bit Linux |
Date: | 2006-08-21 03:52:26 |
Message-ID: | 44E92DFA.3000003@commandprompt.com |
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Thread: | |
Lists: | pgsql-hackers |
> WRT 64-bit and Postgres, it depends on the CPU as to whether you see a
> simple performance benefit. On the Opteron you will see a benefit when
> doing CPU bound work. When doing the CPU portion, the additional registers
> of the Opteron running in 64-bit mode are used by the compiler to produce a
> 20-30% boost in performance. On the Xeon in 64-bit mode, the same regions
> of execution will slow down by about 5%.
Is that true of even Woodcrest?
Joshua D. Drake
>
> Postgres benefits automatically from the larger memory addressing of the
> 64-bit kernel by using the larger I/O cache of Linux.
>
> - Luke
>
>
>
> ---------------------------(end of broadcast)---------------------------
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