| From: | Peter Geoghegan <peter(dot)geoghegan86(at)gmail(dot)com> |
|---|---|
| To: | Shaun Thomas <sthomas(at)optionshouse(dot)com> |
| Cc: | Josh Berkus <josh(at)agliodbs(dot)com>, "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org>, Mark Kirkwood <mark(dot)kirkwood(at)catalyst(dot)net(dot)nz>, "Graeme B(dot) Bell" <grb(at)skogoglandskap(dot)no> |
| Subject: | Re: Turn off Hyperthreading! WAS: 60 core performance with 9.3 |
| Date: | 2014-08-20 23:59:31 |
| Message-ID: | CAEYLb_VM-tL4hjv1mx2DXJEveem5nPsZ2VCrW8GyfcACg1f9KQ@mail.gmail.com |
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| Lists: | pgsql-performance |
On Wed, Aug 20, 2014 at 1:36 PM, Shaun Thomas <sthomas(at)optionshouse(dot)com> wrote:
> That's so strange. Back when I did my Nehalem tests, we got a very strong
> 30%+ increase by enabling HT. We only got a hit when we turned off turbo, or
> forgot to disable power saving features.
In my experience, it is crucially important to consider power saving
features in most benchmarks these days, where that might not have been
true a few years ago. The CPU scaling governor can alter the outcome
of many benchmarks quite significantly.
--
Regards,
Peter Geoghegan
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