Re: hyperthreaded cpu still an issue in 8.4? - Mailing list pgsql-performance

From Scott Marlowe
Subject Re: hyperthreaded cpu still an issue in 8.4?
Date
Msg-id dcc563d10907281623u4c04a3b2yf6699d304125f9af@mail.gmail.com
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In response to Re: hyperthreaded cpu still an issue in 8.4?  (Greg Smith <gsmith@gregsmith.com>)
List pgsql-performance
On Tue, Jul 28, 2009 at 5:21 PM, Greg Smith<gsmith@gregsmith.com> wrote:
> On Tue, 28 Jul 2009, Scott Marlowe wrote:
>
>> Just FYI, I ran the same basic test but with -c 10 since -c shouldn't
>> really be greater than -s
>
> That's only true if you're running the TPC-B-like or other write tests,
> where access to the small branches table becomes a serious hotspot for
> contention.  The select-only test has no such specific restriction as it

I thought so too, but my pgbench -S -c 16 was WAY faster on a -s 16 db
than on a -s10...

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