On 6/16/2012 8:03 AM, Roland Schulz wrote:
Hi,
I would like to start a single process without mpirun and
then use MPI_Comm_spawn to start up as many processes as
required. I don't want the parent process to take up any
resources, so I tried to disconnect the inter communicator and
then finalize mpi and exit the parent. But as soon as I do that
the children exit too. Why is that? Can I somehow change that
behavior? Or can I wait on the children to exit without the
waiting taking up CPU time?
The reason I don't need the parent as soon as the children
are spawned, is that I need one intra-communicator over all
processes. And as far as I know I cannot join the parent and
children to one intra-communicator.
You could use MPI_Intercomm_merge to create an intra-communicator
out of the groups in an inter-communicator and pass the
inter-communicator you get back from the MPI_Comm_spawn call.
--td
The purpose of the whole exercise is that I want that my
program to use all cores of a node by default when executed
without mpirun.
I have tested this with OpenMPI 1.4.5. A sample program is
here:
http://pastebin.com/g2XSZwvY .
"Child finalized" is only printed with the sleep(2) in the
parent not commented out.
Roland
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