> The surprising thing is that 128 machines are much worse than 64; > is this due to communication cost ? I would expect a stagnation more than > a decrease of performance, but maybe the master/slave system does not have > the logarithmic cost as a function of the number of nodes
I don't know yet the main reason for the performance drop beyond 64 machines. It might indeed be due to the simple linear scheme that I am using; a logarithmic algorithm might work better. Jean-loup
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