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MPI C++ in a nested loop

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Old 11-24-2014
MPI C++ in a nested loop
I have a MPI program like this:
Code:
void slave1(int j){
MPI_Status status;
MPI_Recv(&j,1,MPI_INT,0,0,MPI_COMM_WORLD,&status);}

void slave2(int j){
MPI_Status status;
MPI_Recv(&j,1,MPI_INT,0,1,MPI_COMM_WORLD,&status);}


int main(int argc, char *argv[]){
    int numprocs, rank;
    MPI_Init(&argc, &argv);
    MPI_Comm_size(MPI_COMM_WORLD, &numprocs);
    MPI_Comm_rank(MPI_COMM_WORLD, &rank);
    if (rank >0){
        for (int t=2;t<runtime;t++){
            slave1(rank);
            MPI_Barrier(MPI_COMM_WORLD);
            slave2(rank);
            MPI_Barrier(MPI_COMM_WORLD);
        }
    }



    if (rank==0){   
        for(int i=1;i<numprocs;i++){MPI_Send(&i,1,MPI_INT,i,0,MPI_COMM_WORLD);}
        MPI_Barrier(MPI_COMM_WORLD);
        for(int i=1;i<numprocs;i++){MPI_Send(&i,1,MPI_INT,i,1,MPI_COMM_WORLD);}
        MPI_Barrier(MPI_COMM_WORLD);
    }
    MPI_Finalize();}

This work for runtime loop less than 166 times, but after that, I got the error showing:
Fatal error in MPI_Recv: Other MPI error
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LEARN ABOUT OSX

mpi_test_cancelled

MPI_Test_cancelled(3OpenMPI)											      MPI_Test_cancelled(3OpenMPI)

NAME

       MPI_Test_cancelled - Tests whether a request was canceled.

SYNTAX

C Syntax
       #include <mpi.h>
       int MPI_Test_cancelled(MPI_Status *status, int *flag)

Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_TEST_CANCELLED(STATUS, FLAG, IERROR)
	    LOGICAL   FLAG
	    INTEGER   STATUS(MPI_STATUS_SIZE), IERROR

C++ Syntax
       #include <mpi.h>
       bool Status::Is_cancelled() const

INPUT PARAMETER

       status	 Status object (status).

OUTPUT PARAMETERS

       flag	 True if operation was cancelled (logical).

       IERROR	 Fortran only: Error status (integer).

DESCRIPTION

       Returns	flag  = true if the communication associated with the status object was canceled successfully. In such a case, all other fields of
       status (such as count or tag) are undefined. Otherwise, returns flag = false. If a receive operation might be  canceled,  one  should  call
       MPI_Test_cancelled first, to check whether the operation was canceled, before checking on the other fields of the return status.

NOTES

       Cancel can be an expensive operation that should be used only exceptionally.

ERRORS

       Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument. C++ func-
       tions do not return errors. If the default error handler is set to MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception  mechanism
       will be used to throw an MPI:Exception object.

       Before  the error value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job, except for
       I/O function errors. The error handler may be changed with MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN  may	be
       used to cause error values to be returned. Note that MPI does not guarantee that an MPI program can continue past an error.

Open MPI 1.2							  September 2006				      MPI_Test_cancelled(3OpenMPI)