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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_request_get_status

MPI_Request_get_status(3OpenMPI)										  MPI_Request_get_status(3OpenMPI)

NAME

       MPI_Request_get_status - Access information associated with a request without freeing the request.

SYNTAX

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

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

C++ Syntax
       #include <mpi.h>
       bool MPI::Request::Get_status(MPI::Status& status) const

       bool MPI::Request::Get_status() const

INPUT PARAMETER

       request
		       Communication request (handle).

OUTPUT PARAMETERS

       flag	 Boolean flag, same as from MPI_Test (logical).

       status	 MPI_Status object if flag is true (status).

DESCRIPTION

       MPI_Request_get_status  sets flag=true if the operation is complete or sets flag=false if it is not complete. If the operation is complete,
       it returns in status the request status. It does not deallocate or inactivate the request; a subsequent call to test, wait, or free  should
       be executed with that request.

       If your application does not need to examine the status field, you can save resources by using the predefined constant MPI_STATUS_IGNORE as
       a special value for the status argument.

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_Request_get_status(3OpenMPI)