[MITgcm-devel] monitor output with uneven number of threads

[Martin Losch]

Hi,

I run the llc90 configuration with 117 tiles (30x30 each). Now I would like to use a hybrid configuration (to avoid MPI_sends/recv as much as possible), and I though it would be neat to run 9 threads, ie. 90x90 chunks on one mpi-task. I increase MAX_NO_THREADS to 9 and everything works fine, I think, at least the IO looks OK.

But now I see that everything that goes to standardMessageUnit (=6) goes into the STDOUT.* files, as expected, except for the monitor output. I checked, the mon_ioUnit is also 6
A little bit of poking around suggests, that it works fine with an even number of threads (e.g. 4, 8 ,12), but with an uneven number of threads (9, 13) I get this behavior that the master thread on the master mpi process writes the monitor output not into STDOUT.0000 but in the the stdout of the job-script.
I have no idea where to look for the problem. Any pointer are highly appreciated.

Martin