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Re: AW: [HACKERS] sort on huge table - Mailing list pgsql-hackers

From Tom Lane
Subject Re: AW: [HACKERS] sort on huge table
Date
Msg-id 11450.941556206@sss.pgh.pa.us
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In response to AW: [HACKERS] sort on huge table  (Zeugswetter Andreas SEV <ZeugswetterA@wien.spardat.at>)
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Zeugswetter Andreas SEV <ZeugswetterA@wien.spardat.at> writes:
> This new test case is not big enough to show cache memory contention,
> and is thus faster with the new code.

Cache memory contention?  I don't think so.  Take a look at the CPU
versus elapsed times in Tatsuo's prior report on the 2Gb case.
I'm not sure yet what's going on, but it's clear that the bottleneck is
I/O operations not processor/memory speed.
        regards, tom lane

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