Re: NUMA remote memory access cost

[Michael Neumann <mneumann@xxxxxxxx>]

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