| From: | Matthew Wakeling <matthew(at)flymine(dot)org> |
|---|---|
| To: | Dave Youatt <dave(at)meteorsolutions(dot)com> |
| Cc: | Greg Smith <gsmith(at)gregsmith(dot)com>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: hyperthreaded cpu still an issue in 8.4? |
| Date: | 2009-07-28 09:45:01 |
| Message-ID: | alpine.DEB.2.00.0907281037580.19493@aragorn.flymine.org |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-performance |
On Mon, 27 Jul 2009, Dave Youatt wrote:
> Greg, those are compelling numbers for the new Nehalem processors.
> Great news for postgresql. Do you think it's due to the new internal
> interconnect...
Unlikely. Different threads on the same CPU core share their resources, so
they don't need an explicit communication channel at all (I'm simplifying
massively here). A real interconnect is only needed between CPUs and
between different cores on a CPU, and of course to the outside world.
Scott's explanation of why SMT works better now is much more likely to be
the real reason.
Matthew
--
Ozzy: Life is full of disappointments.
Millie: No it isn't - I can always fit more in.
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Robert James | 2009-07-28 13:17:56 | Re: Will Postgres ever lock with read only queries? |
| Previous Message | Tom Lane | 2009-07-28 01:40:36 | Re: Will Postgres ever lock with read only queries? |