| From: | Andres Freund <andres(at)2ndquadrant(dot)com> |
|---|---|
| To: | Josh Berkus <josh(at)agliodbs(dot)com> |
| Cc: | Bruce Momjian <bruce(at)momjian(dot)us>, 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: | 2014-08-22 14:02:23 |
| Message-ID: | 20140822140223.GP17406@alap3.anarazel.de |
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| Thread: | |
| Lists: | pgsql-performance |
On 2014-08-21 14:02:26 -0700, Josh Berkus wrote:
> On 08/20/2014 07:40 PM, Bruce Momjian wrote:
> > Not sure how you can make such a blanket statement when so many people
> > have tested and shown the benefits of hyper-threading.
>
> Actually, I don't know that anyone has posted the benefits of HT.
> Link?
There's definitely cases where it can help. But it's highly workload
*and* hardware dependent.
> OS is RHEL with 2.6.32-431.3.1.el6.x86_64.
>
> I've emailed a kernel hacker who works at Intel for comment; for one
> thing, I'm wondering if the older kernel version is a problem for a
> system like this.
I'm not sure if it has been backported by redhat, but there
definitely have been significant improvement in SMT aware scheduling
after vanilla 2.6.32.
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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