Hi Gilles,
Thanks for your answer.
BR,
Radek
On Thu, May 14, 2015 at 9:12 AM, Gilles Gouaillardet <[email protected]>
wrote:
> This is a known limitation of the sm btl.
>
> FWIW, the vader btl (available in Open MPI 1.8) has the same limitation,
> thought i heard there are some works in progress to get rid of this
> limitation.
>
> Cheers,
>
> Gilles
>
>
> On 5/14/2015 3:52 PM, Radoslaw Martyniszyn wrote:
>
> Dear developers of Open MPI,
>
> I've created two applications: parent and child. Parent spawns children
> using MPI_Comm_spawn. I would like to use shared memory when they
> communicate. However, applications do not start when I try using sm. Please
> comment on that issue. If this feature is not supported, are there any
> plans to add support? Also, are there any examples showing MPI_Comm_spawn
> and shared memory?
>
> I am using Open MPI 1.6.5 on Ubuntu. Both applications are run locally on
> the same host.
>
> // Works fine
> mpirun --mca btl self,tcp ./parent
>
> // Application terminates
> mpirun --mca btl self,sm ./parent
>
> "At least one pair of MPI processes are unable to reach each other for
> MPI communications. This means that no Open MPI device has indicated
> that it can be used to communicate between these processes. This is
> an error; Open MPI requires that all MPI processes be able to reach
> each other. This error can sometimes be the result of forgetting to
> specify the "self" BTL."
>
> Below are code snippets:
>
> parent.cc:
> #include <string>
> #include <unistd.h>
>
> int main(int argc, char** argv) {
> MPI_Init(NULL, NULL);
>
> std::string lProgram = "./child";
> MPI_Comm lIntercomm;
> int lRv;
> lRv = MPI_Comm_spawn( const_cast< char* >(lProgram.c_str()),
> MPI_ARGV_NULL, 3,
> MPI_INFO_NULL, 0, MPI_COMM_WORLD, &lIntercomm,
> MPI_ERRCODES_IGNORE);
>
> if ( MPI_SUCCESS == lRv) {
> std::cout << "SPAWN SUCCESS" << std::endl;
> sleep(10);
> }
> else {
> std::cout << "SPAWN ERROR " << lRv << std::endl;
> }
>
> MPI_Finalize();
> }
>
> child.cc:
> #include <mpi.h>
> #include <iostream>
> #include <unistd.h>
>
> int main(int argc, char** argv) {
> // Initialize the MPI environment
> MPI_Init(NULL, NULL);
>
> std::cout << "CHILD" << std::endl;
> sleep(10);
>
> MPI_Finalize();
> }
>
> makefile (note, there are tabs not spaces preceding each target):
> EXECS=child parent
> MPICC?=mpic++
>
> all: ${EXECS}
>
> child: child.cc
> ${MPICC} -o child child.cc
>
> parent: parent.cc
> ${MPICC} -o parent parent.cc
>
> clean:
> rm -f ${EXECS}
>
>
> Greetings to all of you,
> Radek Martyniszyn
>
>
>
>
>
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>
>
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