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The scaling on NEMO V3.0 is similar to that of version 2.3. For 398 and
794 processor runs the total runtime was found to be highly unstable,
varying as much as 400%. Due to these variations, the results shown
by figure 9 have been taken from the best of 5 runs.
Performance of NEMO V3.0 showing the breakdown of the total runtime
for various processor counts. All tests carried out using PGI compiler
The variability of the total runtime appears to be highly dependent on the
system load. This makes predicting the length of a run or indeed attempting
to specify an appropriate wallclock time difficult. Anything that can be
done to improve this situation will be hugely beneficial to the researchers.