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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_recv

MPI_Recv(3)								MPI							       MPI_Recv(3)

NAME

       MPI_Recv -  Blocking receive for a message

SYNOPSIS

       int MPI_Recv(void *buf, int count, MPI_Datatype datatype, int source, int tag,
		    MPI_Comm comm, MPI_Status *status)

OUTPUT PARAMETERS

       buf    - initial address of receive buffer (choice)
       status - status object (Status)

INPUT PARAMETERS

       count  - maximum number of elements in receive buffer (integer)
       datatype
	      - datatype of each receive buffer element (handle)
       source - rank of source (integer)
       tag    - message tag (integer)
       comm   - communicator (handle)

NOTES

       The count argument indicates the maximum length of a message; the actual length of the message can be determined with MPI_Get_count .

THREAD AND INTERRUPT SAFETY

       This  routine  is  thread-safe.	This means that this routine may be safely used by multiple threads without the need for any user-provided
       thread locks.  However, the routine is not interrupt safe.  Typically, this is due to the use of memory allocation routines such as  malloc
       or other non-MPICH runtime routines that are themselves not interrupt-safe.

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.

       The status argument must be declared as an array of size MPI_STATUS_SIZE , as in integer status(MPI_STATUS_SIZE) .

ERRORS

       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.  Before the value is returned, the current MPI error handler is called.  By default, this error handler aborts  the  MPI
       job.   The  error  handler  may	be  changed  with  MPI_Comm_set_errhandler  (for  communicators), MPI_File_set_errhandler (for files), and
       MPI_Win_set_errhandler (for RMA windows).  The MPI-1 routine MPI_Errhandler_set may be used but its  use  is  deprecated.   The	predefined
       error handler MPI_ERRORS_RETURN may be used to cause error values to be returned.  Note that MPI does not guarentee that an MPI program can
       continue past an error; however, MPI implementations will attempt to continue whenever possible.

       MPI_SUCCESS
	      - No error; MPI routine completed successfully.
       MPI_ERR_COMM
	      - Invalid communicator.  A common error is to use a null communicator in a call (not even allowed in MPI_Comm_rank ).
       MPI_ERR_TYPE
	      - Invalid datatype argument.  May be an uncommitted MPI_Datatype (see MPI_Type_commit ).
       MPI_ERR_COUNT
	      - Invalid count argument.  Count arguments must be non-negative; a count of zero is often valid.
       MPI_ERR_TAG
	      - Invalid tag argument.  Tags must be non-negative; tags in a receive ( MPI_Recv , MPI_Irecv , MPI_Sendrecv  ,  etc.)  may  also	be
	      MPI_ANY_TAG .  The largest tag value is available through the the attribute MPI_TAG_UB .

       MPI_ERR_RANK
	      -  Invalid  source or destination rank.  Ranks must be between zero and the size of the communicator minus one; ranks in a receive (
	      MPI_Recv , MPI_Irecv , MPI_Sendrecv , etc.) may also be MPI_ANY_SOURCE .

LOCATION

       recv.c

								     7/27/2010							       MPI_Recv(3)