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Re: Dual core Opterons beating quad core Xeons?

From: "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>
To: Ron Mayer <rm_pg(at)cheapcomplexdevices(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: Dual core Opterons beating quad core Xeons?
Date: 2007-12-19 20:02:57
Message-ID: 20071219120257.32d1fc50@commandprompt.com (view raw or flat)
Thread:
Lists: pgsql-performance
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On Wed, 19 Dec 2007 11:14:08 -0800
Ron Mayer <rm_pg(at)cheapcomplexdevices(dot)com> wrote:

> Joshua D. Drake wrote:
> > Actually this is not true. Although I have yet to test 8.3. It is
> > pretty much common knowledge that after 8 cores the acceleration of
> > performance drops with PostgreSQL...
> > 
> > This has gotten better every release. 8.1 for example handles 8
> > cores very well, 8.0 didn't and 7.4 well.... :)
> 
> I agree with the spirit of what you say, but are you overstating
> things a bit?

My point was :)... which that PDF actually illustrates is the gain
between say 2 cores and 8 cores is greater than 8 and 16 and even
less when you go beyond 16.

> 
> Benchmarks I see[1] suggest that 8.1.2 scaled pretty reasonably to 16
> cores (from the chart on page 9 in the link below).  But yeah, 8.0
> scaled to maybe 2 cores if you're lucky. :-)

I really need to check this test out more though because their numbers
don't reflect mine. I wonder if that is per connection.

Sincerely,

Joshua D. Drake
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Subject: Re: Dual core Opterons beating quad core Xeons?
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