Hi Jingha,
On 6/7/12 4:28 PM, Jingcha Joba wrote:
Hello Duke,
Welcome to the forum.
The way openmpi schedules by default is to fill all the slots in a
host, before moving on to next host.
Check this link for some info:
http://www.open-mpi.org/faq/?category=running#mpirun-scheduling
Thanks for quick answer. I checked the FAQ, and tried with processes
more than 2, but somehow it got stalled:
[mpiuser@fantomfs40a ~]$ mpirun -v -np 4 --machinefile
/home/mpiuser/.mpi_hostfile ./test/mpihello
^Cmpirun: killing job...
I tried --host flag and it got stalled as well:
[mpiuser@fantomfs40a ~]$ mpirun -v -np 4 --host hp430a,hp430b
./test/mpihello
My configuration must be wrong somewhere. Anyidea how I can check the
system?
Thanks,
D.
--
Jingcha
On Thu, Jun 7, 2012 at 2:11 AM, Duke <duke.li...@gmx.com
<mailto:duke.li...@gmx.com>> wrote:
Hi folks,
Please be gentle to the newest member of openMPI, I am totally new
to this field. I just built a test cluster with 3 boxes on
Scientific Linux 6.2 and openMPI (Open MPI 1.5.3), and I wanted to
test how the cluster works but I cant figure out what was/is
happening. On my master node, I have the hostfile:
[mpiuser@fantomfs40a ~]$ cat .mpi_hostfile
# The Hostfile for Open MPI
fantomfs40a slots=2
hp430a slots=4 max-slots=4
hp430b slots=4 max-slots=4
To test, I used the following c code:
[mpiuser@fantomfs40a ~]$ cat test/mpihello.c
/* program hello */
/* Adapted from mpihello.f by drs */
#include <mpi.h>
#include <stdio.h>
int main(int argc, char **argv)
{
int *buf, i, rank, nints, len;
char hostname[256];
MPI_Init(&argc,&argv);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
gethostname(hostname,255);
printf("Hello world! I am process number: %d on host %s\n",
rank, hostname);
MPI_Finalize();
return 0;
}
and then compiled and ran:
[mpiuser@fantomfs40a ~]$ mpicc -o test/mpihello test/mpihello.c
[mpiuser@fantomfs40a ~]$ mpirun -np 2 --machinefile
/home/mpiuser/.mpi_hostfile ./test/mpihello
Hello world! I am process number: 0 on host fantomfs40a
Hello world! I am process number: 1 on host fantomfs40a
Unfortunately the result did not show what I wanted. I expected to
see somethign like:
Hello world! I am process number: 0 on host hp430a
Hello world! I am process number: 1 on host hp430b
Anybody has any idea what I am doing wrong?
Thank you in advance,
D.
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