Hi,
I think you misunderstood what a MIMD launch with mpirun/mpiexec actually
does.
mpirun -np X prog1 : -np Y prog2
starts a *single* MPI job consisting of X+Y processes in total of which the
X processes execute prog1 and Y processes execute prog2 but they still
belong to the same MPI job and hence share the same rank space and
MPI_COMM_WORLD. Ranks 0 to X-1 execute prog1 and ranks X to Y-1 - prog2.
Cheers,
Hristo
From: users-bounces_at_[hidden] [mailto:users-bounces_at_[hidden]] On
Behalf Of Ufuk Utku Turuncoglu (BE)
Sent: Thursday, June 21, 2012 9:29 AM
To: users_at_[hidden]
Subject: [OMPI users] two jobs in a single mpirun command and MPI_COMM_WORLD
issue ...
Hi,
I try to submit two MPI jobs using single OpenMPI mpirun command (command
can be seen in job submission script). To test this configuration, i
compiled simple mpihello application and run. The problem is that each
distinct mpihello jobs (run1 and run2) uses same MPI_COMM_WORLD and rank of
the process goes like following,
--- out1 (comes from first mpihello.x) ---
node 17 : Hello world
node 28 : Hello world
...
...
--- out2 (comes from second mpihello.x) ---
node 115 : Hello world
node 113 : Hello world
node 74 : Hello world
...
...
If the MPI_COMM_WORLD is created separately for each jobs then the node
number (or id or rank) must be start from 0 until 63 in each log file but
this is not the case. So, in the second one the node numbers start from 64
to 131. If Fortran application uses MPI_COMM_SIZE and MPI_COMM_RANK to get
the total number of processor (in this case it is 132), then rank and total
number of processor will be wrong. I think mpirun is not smart enough in
this case. What do you think? Any suggestions can help.
PS: I am using OpenMPI version 1.5.3 compiled with Intel 12.0.4 compilers.
Regards,
--ufuk
--- job submission script (in OpenPBS) ---
#!/bin/bash
#PBS -l walltime=01:00:00
#PBS -l nodes=11:ppn=12
#PBS -N both
#PBS -q esp
# load modules
. /etc/profile.d/modules.sh
module load openmpi/1.5.3/intel/2011
module load netcdf/4.1.1/intel/11.1
# parameters
WRKDIR1=/home/netapp/clima-users/users/uturunco/CAS/run.lake/BOTH
WRKDIR2=/home/netapp/clima-users/users/uturunco/CAS/run.lake/BOTH
# create node files
head -n 64 $PBS_NODEFILE >& $WRKDIR1/nodes1.txt
tail -n 64 $PBS_NODEFILE >& $WRKDIR2/nodes2.txt
# submit jobs
mpirun -np `cat $WRKDIR1/nodes1.txt | wc -l` -machinefile
$WRKDIR1/nodes1.txt -wd $WRKDIR1 ./run1.sh : -np `cat $WRKDIR2/nodes2.txt |
wc -l` -machinefile $WRKDIR2/nodes2.txt -wd $WRKDIR2 ./run2.sh
--- end of job submission script ---
--- script run1.sh ---
#!/bin/sh
./mpihello.x >> out1.txt
--- end of script run1.sh ---
--- script run2.sh ---
#!/bin/sh
./mpihello.x >> out2.txt
--- end of script run2.sh ---
--
Hristo Iliev, Ph.D. -- High Performance Computing
RWTH Aachen University, Center for Computing and Communication
Rechen- und Kommunikationszentrum der RWTH Aachen
Seffenter Weg 23, D 52074 Aachen (Germany)
Tel: +49 241 80 24367 -- Fax/UMS: +49 241 80 624367
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