NUMA remote memory access cost

Michael Neumann mneumann at
Fri Jan 9 10:20:04 PST 2009

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?
> 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.


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