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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