Dear RegCNeters,

I am running the model on a single node with 256 cores (32 sockets of 8 cores) at 12-km res (ds) over a relatively small domain (Puerto Rico) with the following settings:

iy = 64

jx = 80

kz = 18

I attempted several runs ranging from procs of 86 - 192, all of which yielded the above message * the number of processors. I was sure to select procs that were easily divisible by the iy and jx values above and that met the 3x3 box per processor minimum, e.g., 128 yields:

CPUS DIM1 = 16, divided into 80 (jx) = 5 (> 3)

CPUS DIM2 = 8, divided into 64 (iy) = 8  (> 3)

Any ideas? Is this an issue with how I set up the model or the single-node system I'm using?

On a related note, the documentation (version 4.4) states.....

"In the current version 4.4 the model parallelizes execution dividing the

work between the processors, with the minimum work per processor is 9

points or a box 3 * 3, so the maximum number of processors which can be

used in a parallel run for the above configuration [iy=34, jx=48] is roughly 180."

I arrive at 180(ish) by multiplying 34 * 48 and dividing by 9. However, when I do the same for my domain above (64 * 80 / 9), I get 569. I am missing something?

Many thanks.

Best,

Alex