How to create an MPI group with spawned processes?
I am spawning mpi processes with
# Master side
comm = MPI.COMM_SELF.Spawn(sys.executable, ["worker.py"], maxprocs=2)
on the master side and
# Worker side
comm = MPI.Comm.Get_parent()
workerComm = MPI.COMM_WORLD
on the worker side. I am able to send data back and forth using point-to-point communication as well as collective communications. I am able to create groups on the worker side using the workerComm with
newGroup = workerComm.group.Incl([0])
newComm = workerComm.Create_group(newGroup)
But how is it possible to create a group with the master and worker side in a way that I can use collective communications from the master side with only a subset of workers?
python mpi grouping spawn mpi4py
asked Nov 21 '18 at 11:43
Woltan
8,676116185
add a comment |
I am spawning mpi processes with
# Master side
comm = MPI.COMM_SELF.Spawn(sys.executable, ["worker.py"], maxprocs=2)
on the master side and
# Worker side
comm = MPI.Comm.Get_parent()
workerComm = MPI.COMM_WORLD
on the worker side. I am able to send data back and forth using point-to-point communication as well as collective communications. I am able to create groups on the worker side using the workerComm with
newGroup = workerComm.group.Incl([0])
newComm = workerComm.Create_group(newGroup)
But how is it possible to create a group with the master and worker side in a way that I can use collective communications from the master side with only a subset of workers?
python mpi grouping spawn mpi4py
asked Nov 21 '18 at 11:43
Woltan
8,676116185
1
If you want an inter communicator, you canMPI_Comm_split(comm, ...)usecolor=0for the tasks that should be in the new communicator andcolor=MPI_UNDEFINEDfir the others.
– Gilles Gouaillardet
Nov 21 '18 at 12:38
@GillesGouaillardet Thank you again for the answer. If you post it then I will accept it.
– Woltan
Nov 21 '18 at 13:48
add a comment |
I am spawning mpi processes with
# Master side
comm = MPI.COMM_SELF.Spawn(sys.executable, ["worker.py"], maxprocs=2)
on the master side and
# Worker side
comm = MPI.Comm.Get_parent()
workerComm = MPI.COMM_WORLD
on the worker side. I am able to send data back and forth using point-to-point communication as well as collective communications. I am able to create groups on the worker side using the workerComm with
newGroup = workerComm.group.Incl([0])
newComm = workerComm.Create_group(newGroup)
But how is it possible to create a group with the master and worker side in a way that I can use collective communications from the master side with only a subset of workers?
python mpi grouping spawn mpi4py
asked Nov 21 '18 at 11:43
Woltan
8,676116185
I am spawning mpi processes with
# Master side
comm = MPI.COMM_SELF.Spawn(sys.executable, ["worker.py"], maxprocs=2)
on the master side and
# Worker side
comm = MPI.Comm.Get_parent()
workerComm = MPI.COMM_WORLD
on the worker side. I am able to send data back and forth using point-to-point communication as well as collective communications. I am able to create groups on the worker side using the workerComm with
newGroup = workerComm.group.Incl([0])
newComm = workerComm.Create_group(newGroup)
But how is it possible to create a group with the master and worker side in a way that I can use collective communications from the master side with only a subset of workers?
python mpi grouping spawn mpi4py
python mpi grouping spawn mpi4py
asked Nov 21 '18 at 11:43
Woltan
8,676116185
asked Nov 21 '18 at 11:43
Woltan
8,676116185
asked Nov 21 '18 at 11:43
Woltan
8,676116185
asked Nov 21 '18 at 11:43
Woltan
8,676116185
asked Nov 21 '18 at 11:43
Woltan
8,676116185
8,676116185
1
If you want an inter communicator, you canMPI_Comm_split(comm, ...)usecolor=0for the tasks that should be in the new communicator andcolor=MPI_UNDEFINEDfir the others.
– Gilles Gouaillardet
Nov 21 '18 at 12:38
@GillesGouaillardet Thank you again for the answer. If you post it then I will accept it.
– Woltan
Nov 21 '18 at 13:48
add a comment |
1
If you want an inter communicator, you canMPI_Comm_split(comm, ...)usecolor=0for the tasks that should be in the new communicator andcolor=MPI_UNDEFINEDfir the others.
– Gilles Gouaillardet
Nov 21 '18 at 12:38
@GillesGouaillardet Thank you again for the answer. If you post it then I will accept it.
– Woltan
Nov 21 '18 at 13:48
1
1
If you want an inter communicator, you can
MPI_Comm_split(comm, ...) use color=0 for the tasks that should be in the new communicator and color=MPI_UNDEFINED fir the others.– Gilles Gouaillardet
Nov 21 '18 at 12:38
If you want an inter communicator, you can
MPI_Comm_split(comm, ...) use color=0 for the tasks that should be in the new communicator and color=MPI_UNDEFINED fir the others.– Gilles Gouaillardet
Nov 21 '18 at 12:38
@GillesGouaillardet Thank you again for the answer. If you post it then I will accept it.
– Woltan
Nov 21 '18 at 13:48
@GillesGouaillardet Thank you again for the answer. If you post it then I will accept it.
– Woltan
Nov 21 '18 at 13:48
add a comment |
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1
If you want an inter communicator, you can
MPI_Comm_split(comm, ...)usecolor=0for the tasks that should be in the new communicator andcolor=MPI_UNDEFINEDfir the others.– Gilles Gouaillardet
Nov 21 '18 at 12:38
@GillesGouaillardet Thank you again for the answer. If you post it then I will accept it.
– Woltan
Nov 21 '18 at 13:48