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From: Greg Smith <greg@2ndquadrant.com>
To: Clemens Eisserer <linuxhippy@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Performance on new 64bit server compared to my 32bit desktop
Date: Mon, 30 Aug 2010 18:31:53 -0400
Message-ID: <4C7C3159.9040700@2ndquadrant.com> (raw)
In-Reply-To: <AANLkTimEhqCpZKkYQbkkHOnw0Nqj+0gr2PpD3ui-pOVQ@mail.gmail.com>
References: <4C6CE64D.6070104@edd.fr>
	<4C6D76FE.9010407@2ndquadrant.com>
	<E613263E-09D5-4562-BBAF-C72B09883E26@richrelevance.com>
	<4C77F4F4.4020900@2ndquadrant.com>
	<A3668C49-1162-4628-8640-444FEBD91429@richrelevance.com>
	<4C7BCB13.7000709@2ndquadrant.com>
	<AANLkTimEhqCpZKkYQbkkHOnw0Nqj+0gr2PpD3ui-pOVQ@mail.gmail.com>

Clemens Eisserer wrote:
> Hi,
>
>   
>>> This isn't an older Opteron, its 6 core, 6MB L3 cache "Istanbul".  Its not
>>> the newer stuff either.
>>>       
>> Everything before Magny Cours is now an older Opteron from my perspective.
>>     
>
> The 6-cores are identical to Magny Cours (except that Magny Cours has
> two of those beast in one package).
>   

In some ways, but not in regards to memory issues.  
http://www.anandtech.com/show/2978/amd-s-12-core-magny-cours-opteron-6174-vs-intel-s-6-core-xeon/2 
has a good intro.  While the inside is like two 6-core models stuck 
together, the external memory interface was completely reworked.

Original report here involved Opteron 2427, correctly idenitified as 
being from the 6-core "Istanbul" architecture.  All Istanbul processors 
use DDR2 and are quite slow at memory access compared to similar Intel 
Nehalem systems.  The "Magny-Cours" architecture is available in 8 and 
12 core variants, and the memory controller has been completely 
redesigned to take advantage of many banks of DDR3 at the same time; it 
is far faster than two of the older 6 cores working together.

http://en.wikipedia.org/wiki/List_of_AMD_Opteron_microprocessors has a 
good summary of the models; it's confusing.  Quick chart showing the 
three generations compared demonstrates what I just said above using the 
same STREAM benchmarking that a few results have popped out here using 
already:

http://www.anandtech.com/show/2978/amd-s-12-core-magny-cours-opteron-6174-vs-intel-s-6-core-xeon/5

Istanbul Opteron 2435 in this case, 21GB/s.  The two Nehelam Intel 
Xeons, >31GB/s.  New Magny, 49MB/s.

-- 
Greg Smith  2ndQuadrant US  Baltimore, MD
PostgreSQL Training, Services and Support
greg@2ndQuadrant.com   www.2ndQuadrant.us

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