Hallo Kilian,
Samstag, 19. April 2008, meintest Du:
KC> On Wednesday 09 April 2008 11:48:19 am Greg Lindahl wrote:
>> p.s. did anyone see this blog posting claiming that it takes Linux
>> clusters several minutes to start a 2048 core job?
>> http://terboven.spaces.live.com/Blog/cns!EA3D3C756483FECB!267.entry
>> I would have commented, but you have to have a Microsoft ID to
>> comment.
KC> That's a pretty amusing blog, actually. See
KC> http://terboven.spaces.live.com/blog/cns!EA3D3C756483FECB!255.entry
KC> (wonderful permalinks, btw).
Read this arcticle to the end:
"Finally, lets take a quick look at some performance measurements. From the
Intel MPI Benchmark Suite V3.1 I used the MPI-1 part to measure the latency and
bandwidth. Please note that you have to divide the PingPong-latency by two in
order to get the "real" MPI-latency. In doing so we see a MPI latency of aboud
2.9 us on our 4x DDR InfiniBand. "
What? They divided the number of the benchmark by two? Correct me if i'm wrong
but i was always assuming that the benchmark does this himself!
Can somebody confirm that?
Cheers,
Jan
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