DragonFly kernel List (threaded) for 2009-01
DragonFly BSD
DragonFly kernel List (threaded) for 2009-01
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Re: NUMA remote memory access cost


To: Hasso Tepper <hasso@xxxxxxxxx>
From: Michael Neumann <mneumann@xxxxxxxx>
Date: Fri, 09 Jan 2009 19:20:04 +0100

Am 08.01.2009 21:02, schrieb Hasso Tepper:
> Michael Neumann wrote:
>> Anyone knows the cost (in case of an Opteron) of a remote memory access
>> vs. a local memory access?
>
> http://lwn.net/Articles/254445/ has some numbers. Whole series is
> excellent reading in general, btw.

Very interesting reading.

So when I read the data correctly, in a 2-way Opteron system, a remote
read (write) is 10% (25%) slower than a local one. Those numbers are
from AMD. A collegue of mine measured in his diploma thesis a difference
of around 40% for reads.

Regards,

Michael



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