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Ethernet vs. InfiniBand

Have you ever tried to compare scalability of Ethernet versus InfiniBand on HPC cluster? I was shocked.

It’s a solution of three-dimensional partial differential equation using the Fast Fourier transform. Comparison isn’t absolutely fair. Because I used gcc compiler for Ethernet version and Sun compiler for InfiniBand. Hence the difference between versions on small number of CPUs. But regardess of the fact that gcc is a bit faster Ethernet shows no scalability at all! It’s unbelievable how Ethernet is slow.

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This entry was posted on January 18, 2010 at 9:37 am and is filed under HPC. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

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