[Beowulf] Re: dual core (latency)
diep at xs4all.nl
Tue Jul 19 05:27:48 PDT 2005
At 10:31 PM 7/18/2005 -0700, Greg Lindahl wrote:
>On Tue, Jul 19, 2005 at 06:42:02AM +0200, Vincent Diepeveen wrote:
>> You keep mixing latency and bandwidth. That's ugly, to say polite.
>If you're through berating Stuart, can you be bothered to explain why
>you think TLB misses should be so cheap? Many architectures have much
>worse TLB miss performance than the Opteron. Go bother the Power5
Point is that latency to a single core in a dual core dual system is far
slower than a single core in a dual system or a single core in a quad system.
Idemdito a single core in a quad dual core system is also dead slow to access.
In short a TLB miss at a dual core has a larger latency than a TLB miss at
a single core, also when the other cores aren't busy.
This for a read, which seemingly cannot be done in parallel by dual cores.
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