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From: Scott Marlowe <scott.marlowe@gmail.com>
To: Greg Smith <greg@2ndquadrant.com>
Cc: Bob Dusek <redusek@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: performance config help
Date: Mon, 11 Jan 2010 16:29:29 -0700
Message-ID: <dcc563d11001111529m66f6cf7n15e73e2639ab4ef2@mail.gmail.com> (raw)
In-Reply-To: <4B4BB174.6020608@2ndquadrant.com>
References: <61039b861001110544o2c352763q13dcf9d78a156714@mail.gmail.com>
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	<61039b861001110842g15bb1f26jc50b6e6762e01427@mail.gmail.com>
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	<4B4BA058.4070703@2ndquadrant.com>
	<dcc563d11001111444w6251c638y2aa39f386fb0d1d8@mail.gmail.com>
	<4B4BB174.6020608@2ndquadrant.com>

On Mon, Jan 11, 2010 at 4:17 PM, Greg Smith <greg@2ndquadrant.com> wrote:
> Scott Marlowe wrote:
>>
>> The DDR3 Nehalem and DDR2 AMD are both actually pretty close in real
>> world use on 4 or more socket machines.  Most benchmarks on memory
>> bandwidth give no huge advantage to either one or the other.  They
>> both max out at about 25GB/s.
>>
>
> The most fair comparison I've seen so far is
> http://www.advancedclustering.com/company-blog/stream-benchmarking.html
> which puts the faster Intel solutions at 37GB/s, while the Opterons bog down
> at 20GB/s.  That matches my own tests pretty well too--Intel's got at least
> a 50% lead here in many cases.

But that's with only 2 sockets.  I'd like to see something comparing 4
or 8 socket machines.  Hmmm, off to googol.



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