| From: | Greg Smith <greg(at)2ndquadrant(dot)com> |
|---|---|
| To: | Yeb Havinga <yebhavinga(at)gmail(dot)com> |
| Cc: | Jose Ildefonso Camargo Tolosa <ildefonso(dot)camargo(at)gmail(dot)com>, "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: Performance on new 64bit server compared to my 32bit desktop |
| Date: | 2010-08-31 15:43:41 |
| Message-ID: | 4C7D232D.6030802@2ndquadrant.com |
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| Lists: | pgsql-performance |
Yeb Havinga wrote:
> The rather wierd dip at 5 threads is consistent over multiple tries
I've seen that twice on 4 core systems now. The spot where there's just
one more thread than cores seems to be the worst case for cache
thrashing on a lot of these servers.
How much total RAM is in this server? Are all the slots filled? Just
filling in a spreadsheet I have here with sample configs of various
hardware.
Yeb's results look right to me now. That's what an AMD Phenom II X4 940
@ 3.00GHz should look like. It's a little faster, memory-wise, than my
older Intel Q6600 @ 2.4GHz. So they've finally caught up with that
generation of Intel's stuff. But my current desktop quad-core i860 with
hyperthreading is nearly twice as fast in terms of memory access at
every thread size. That's why I own one of them instead of a Phenom II X4.
--
Greg Smith 2ndQuadrant US Baltimore, MD
PostgreSQL Training, Services and Support
greg(at)2ndQuadrant(dot)com www.2ndQuadrant.us
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