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Subject: [OMPI users] OpenMPI causing WRF to crash
From: BasitAli Khan (BasitAli.Khan_at_[hidden])
Date: 2011-08-03 07:24:32


I am trying to run a rather heavy wrf simulation with spectral nudging but the simulation crashes after 1.8 minutes of integration.
 The simulation has two domains with d01 = 601x601 and d02 = 721x721 and 51 vertical levels. I tried this simulation on two different systems but result was more or less same. For example

On our Bluegene/P with SUSE Linux Enterprise Server 10 ppc and XLF compiler I tried to run wrf on 2048 shared memory nodes (1 compute node = 4 cores , 32 bit, 850 Mhz). For the parallel run I used mpixlc, mpixlcxx and mpixlf90. I got the following error message in the wrf.err file

<Aug 01 19:50:21.244540> BE_MPI (ERROR): The error message in the job
record is as follows:
<Aug 01 19:50:21.244657> BE_MPI (ERROR): "killed with signal 15"

I also tried to run the same simulation on our linux cluster (Linux Red Hat Enterprise 5.4m x86_64 and Intel compiler) with 8, 16 and 64 nodes (1 compute node=8 cores). For the parallel run I am used mpi/openmpi/1.4.2-intel-11. I got the following error message in the error log after couple of minutes of integration.

"mpirun has exited due to process rank 45 with PID 19540 on
node ci118 exiting without calling "finalize". This may
have caused other processes in the application to be
terminated by signals sent by mpirun (as reported here)."

I tried many things but nothing seems to be working. However, if I reduce grid points below 200, the simulation goes fine. It appears that probably OpenMP has problem with large number of grid points but I have no idea how to fix it. I will greatly appreciate if you could suggest some solution.

Best regards,

---
Basit A. Khan, Ph.D.
Postdoctoral Fellow
Division of Physical Sciences & Engineering
Office# 3204, Level 3, Building 1,
King Abdullah University of Science & Technology
4700 King Abdullah Blvd, Box 2753, Thuwal 23955 –6900,
Kingdom of Saudi Arabia.
Office: +966(0)2 808 0276,  Mobile: +966(0)5 9538 7592
E-mail: basitali.khan_at_[hidden]
Skype name: basit.a.khan