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Subject: [OMPI users] mpirun runs in serial even I set np to several processors
From: Djordje Romanic (djordje8_at_[hidden])
Date: 2014-04-14 13:15:45


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