On 08/16/2011 12:30 PM, Ralph Castain wrote:
What version are you using?
OpenMPI 1.4.3
On Aug 16, 2011, at 3:19 AM, Simone Pellegrini wrote:
Dear all,
I am developing a system to manage MPI tasks on top of MPI. The architecture is
rather simple, I have a set of scheduler processes which takes care to manage
the resources of a node. The idea is to have 1 (or more) of those scheduler
allocated on each node of a cluster and then create new MPI processes (on
demand) as computation is needed. Allocation of processes is done using
MPI_Spawn.
The system now works fine on a single node by allocating the main scheduler
using the following mpi command:
mpirun --np 1 ./scheduler ...
Now when I scale to multiple nodes problems with default MPI behaviour starts.
For example lets assume I have 2 nodes with 8 cpu cores each. I therefore set
up a machine file in the following way:
s01 slots=1
s02 slots=1
and start the node schedulers in the following way:
mpirun --np 2 --machinefile machinefile ./scheduler ...
This allocates the processes correctly, now the problem starts when I invoke
MPI_Spawn. basically MPI spawn also uses the informations from the machinefile
and if 4 MPI processes are spawned 2 are allocated in s01 and 2 on s02. What I
want is to allocate the processes always in the same node.
I tried to do this by specifying an MPI_Info object which is then passed to the MPI_Spawn
routine. I tried to set the "host" property to the hostname of the machine
where the scheduler is running but this didn't help.
Unfortunately there is very little documentation on this.
Thanks for the help,
Simone
_______________________________________________
users mailing list
us...@open-mpi.org
http://www.open-mpi.org/mailman/listinfo.cgi/users
_______________________________________________
users mailing list
us...@open-mpi.org
http://www.open-mpi.org/mailman/listinfo.cgi/users
