[MITgcm-devel] new r4 SingleCpuIO efficiency

[Dimitris Menemenlis]

Jean-Michel, what is status of switch-over to new exchange topology?
Do I still use the old w2_e2setup.F/W2_EXCH2_TOPOLOGY.h
routines or do I need to update to the new stuff.

Look forward to giving the r4 IO a try.  IO is biggest bottleneck
both for forward as well as for adjoint integrations.

D.

On May 22, 2009, at 7:51 AM, Jean-Michel Campin wrote:

> Hi Dimitris,
>
> If by chance you have time to check with a short run
> how the new version of SingleCpuIO is doing on cs-510
> (well, given the bug I put & remove only yesterday, I guess
> you did not try yet), I would be curious to know if you
> can see a speed up with large amount of r4 io (compared to
> checkpoint61m). The volume of MPI send/receive for r4 io
> has been reduced by 2 (was r8 before) and this might speed up
> a little the run. And if something goes wrong, let me know.
>
> Thanks,
> Jean-Michel

Dimitris Menemenlis <menemenlis at jpl.nasa.gov>
Jet Propulsion Lab, California Institute of Technology
MS 300-323, 4800 Oak Grove Dr, Pasadena CA 91109-8099, USA
tel: 818-354-1656;  cell: 818-625-6498;  fax: 818-393-6720