On 04/14/2014 01:15 PM, Djordje Romanic wrote:
Hi,
I am trying to run WRF-ARW in parallel. This is configuration of my system:
-------------------------------------------------
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 4
On-line CPU(s) list: 0-3
Thread(s) per core: 1
Core(s) per socket: 4
Socket(s): 1
NUMA node(s): 1
Vendor ID: AuthenticAMD
CPU family: 16
Model: 2
Stepping: 3
CPU MHz: 1150.000
BogoMIPS: 4587.84
Virtualization: AMD-V
L1d cache: 64K
L1i cache: 64K
L2 cache: 512K
L3 cache: 2048K
NUMA node0 CPU(s): 0-3
-------------------------------------------------
When I start wrf with mpirun -np 4 ./wrf.exe, I get this:
-------------------------------------------------
starting wrf task 0 of 1
starting wrf task 0 of 1
starting wrf task 0 of 1
starting wrf task 0 of 1
-------------------------------------------------
This indicates that it is not using 4 processors, but 1.
Any idea what might be the problem?
Thanks,
Djordje
Did you compile WRF with MPI enabled (i.e. serial,
not OpenMP, or openMP only, which is a different beast than OpenMPI =
note the trailing "I") ?
If you compiled serial, or OpenMP and did not set OMP_NUM_THREADS,
the mpirun command above will launch 4
separate/independent/repetitive/non-communicating processes
doing the same exact thing (and probably overwriting each other's
output, etc).
Did you compile and link to the OpenMPI libraries, or perhaps to
another MPI implementation?
I hope this helps,
Gus Correa
