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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 DEBIAN

mpi_status_f2c

MPI_Status_f2c(3)						      LAM/MPI							 MPI_Status_f2c(3)

NAME

       MPI_Status_f2c -  Convert a status from its Fortran representation to its C representation

SYNOPSIS

       #include <mpi.h>
       int
       MPI_Status_f2c(MPI_Fint *f_status, MPI_Status *c_status)

INPUT PARAMETER

       f_status
	      - Fortran status

OUTPUT PARAMETER

       c_status
	      - C status

NOTES FOR FORTRAN

       All  MPI  routines in Fortran (except for MPI_WTIME and MPI_WTICK ) have an additional argument ierr at the end of the argument list.  ierr
       is an integer and has the same meaning as the return value of the routine in C.	In Fortran, MPI routines are subroutines, and are  invoked
       with the call statement.

       All MPI objects (e.g., MPI_Datatype , MPI_Comm ) are of type INTEGER in Fortran.

ERRORS

       If an error occurs in an MPI function, the current MPI error handler is called to handle it.  By default, this error handler aborts the MPI
       job.  The error handler may be changed with MPI_Errhandler_set ; the predefined error handler MPI_ERRORS_RETURN may be used to cause  error
       values  to  be  returned  (in  C and Fortran; this error handler is less useful in with the C++ MPI bindings.  The predefined error handler
       MPI::ERRORS_THROW_EXCEPTIONS should be used in C++ if the error value needs to be recovered).  Note that MPI does not guarantee that an MPI
       program can continue past an error.

       All  MPI  routines (except MPI_Wtime and MPI_Wtick ) return an error value; C routines as the value of the function and Fortran routines in
       the last argument.  The C++ bindings for MPI do not return error values; instead, error values are communicated by throwing  exceptions	of
       type MPI::Exception (but not by default).  Exceptions are only thrown if the error value is not MPI::SUCCESS .

       Note  that  if the MPI::ERRORS_RETURN handler is set in C++, while MPI functions will return upon an error, there will be no way to recover
       what the actual error value was.
       MPI_SUCCESS
	      - No error; MPI routine completed successfully.

SEE ALSO

       MPI_Status_c2f(3)

MORE INFORMATION

       For more information, please see the official MPI Forum web site, which contains the text of both the MPI-1  and  MPI-2	standards.   These
       documents contain detailed information about each MPI function (most of which is not duplicated in these man pages).

       http://www.mpi-forum.org/

LOCATION

       handles.c

LAM
/MPI 7.1.4							     6/24/2006							 MPI_Status_f2c(3)