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Re: Performance on new 64bit server compared to my 32bit desktop

From: Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>
To: Yeb Havinga <yebhavinga(at)gmail(dot)com>
Cc: Greg Smith <greg(at)2ndquadrant(dot)com>, 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 18:56:53
Message-ID: AANLkTi=6-iQ=btYdg79DVXof+Qib0O3obfy5ZDiMfMHR@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-performance
On Tue, Aug 31, 2010 at 12:55 PM, Yeb Havinga <yebhavinga(at)gmail(dot)com> wrote:
> Scott Marlowe wrote:
>>
>> On Tue, Aug 31, 2010 at 6:41 AM, Yeb Havinga <yebhavinga(at)gmail(dot)com> wrote:
>>
>>>>
>>>> export OMP_NUM_THREADS=4
>>>>
>>>
>>> Then I get the following. The rather wierd dip at 5 threads is consistent
>>> over multiple tries:
>>>
>>>
>>
>> I get similar dips on my server.  Especially as you make the stream
>> test write a large enough chunk of data to outrun its caches.
>>
>> See attached png.
>>
>
> Interesting graph, especially since the overall feeling is a linear like
> increase in memory bandwidth when more cores are active.
>
> Just curious, what is the 8-core cpu?

8 core = dual 2352 cpus (2x4) 2.1 GHz
12 core = dual 2427 cpus (2x6) 2.2 GHz
48 core = quad 6127 cpus (4x12) 2.1 GHz

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