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

From: Yeb Havinga <yebhavinga(at)gmail(dot)com>
To: Scott Marlowe <scott(dot)marlowe(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 18:55:29
Message-ID: 4C7D5021.3090803@gmail.com
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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?

-- Yeb

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