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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_file_read_at_all_end

MPI_File_read_at_all_end(3OpenMPI)										MPI_File_read_at_all_end(3OpenMPI)

NAME

       MPI_File_read_at_all_end - Reads a file at explicitly specified offsets; ending part of a split collective routine (blocking).

SYNTAX

       C Syntax
	   #include <mpi.h>
	   int MPI_File_read_at_all_end(MPI_File fh, void *buf,
	    MPI_Status *status)

       Fortran Syntax
	   INCLUDE 'mpif.h'
	   MPI_FILE_READ_AT_ALL_END(FH, BUF, STATUS, IERROR)
		 <TYPE> 	BUF(*)
		 INTEGER	FH, STATUS(MPI_STATUS_SIZE), IERROR

C++ Syntax
       #include <mpi.h>
       void MPI::File::Read_at_all_end(void* buf, MPI::Status& status)

       void MPI::File::Read_at_all_end(void* buf)

INPUT PARAMETER

       fh	 File handle (handle).

OUTPUT PARAMETERS

       buf	 Initial address of buffer (choice).

       status	 Status object (status).

       IERROR	 Fortran only: Error status (integer).

DESCRIPTION

       MPI_File_read_at_all_end is a split collective routine that stores the number of elements actually read from the file associated with fh in
       status.	MPI_File_read_at_all_end blocks until the operation initiated by MPI_File_read_at_all_begin completes. The data is  taken  out	of
       those parts of the file specified by the current view. All other fields of status are undefined.

NOTES

       All  the  nonblocking  collective routines for data access are "split" into two routines, each with _begin or _end as a suffix. These split
       collective routines are subject to the semantic rules described in Section 9.4.5 of the MPI-2 standard.

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. For MPI I/O function errors, the default error handler is  set
       to  MPI_ERRORS_RETURN. The error handler may be changed with MPI_File_set_errhandler; the predefined error handler MPI_ERRORS_ARE_FATAL may
       be used to make I/O errors fatal. Note that MPI does not guarantee that an MPI program can continue past an error.

Open MPI 1.2							  September 2006				MPI_File_read_at_all_end(3OpenMPI)