David Webb wrote: > > >I am not sure why the POP EOS calculation is so expensive. Again, > >however, I suggest that the relative cost of any piece of code can be > >quite dependent on model size, physical parameterizations, compiler, > >processors, etc. MOM4 may show similar inefficiency in the EOS for > >other configurations, yet we have not seen such at this point... > > Steve, > > Based on our experience with a number of multi-processor systems, I would > start by suspecting cache conflicts. With memory working at 100 MHz and > cpus at 1000 MHz, references to memory are very expensive. > > Regards, David.
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