Hello,
first, thank you for the great toolkit; libmesh should be an
example for all the open source (and commercial) scientific applications
out there.
I'm not getting stellar performances with the petsc linear solver on
a 64 bit Xeon (8 CPUs with 64 Gb RAM). The machine processors are
clocked at 3 GHz, but -log_summary tells me I'm running at 1e8 flops/s
(on a single processor; I don't see a big speedup with more processors,
but that's probably due to memory bandwidth). That's 30x slower than the
clock speed. Is that normal? Have other users seen this order of
magnitude difference between clock speed and flop/s on other systems?
I'm testing a system with ~100,000 DOFs, using the cg solver.
I'd like to know if I should invest time in tuning my libraries/system,
or just give up and buy a better computer.
Thanks,
JS
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