[mpich-discuss] error in use recv

[姚远志]

Hi
      There are some queer errors exist in my program.
     I spawn some children processes:
   MPI_Comm_spawn(command,Conf, NumOfChild ,MPI_INFO_NULL, 0 , MPI_COMM_SELF ,&children , MPI_ERRCODES_IGNORE);
  
 and after calculating I want to send the data back to the mater processes
 In the children processes:
  MPI_Send(outBuf,NumofPixPrc,MPI_FLOAT,0,5,parent);
  
 and in the the master processes, the corresspond code is:
  //the collection of the data from all the other children proc. 
 for(int i=1; i<NumOfProc; i++)
 {
  int index=0;
  int scale2=0;
   int RecStart = i * end ;
  int RecEnd ;
  if(i<NumOfChild){
   RecEnd = (i+1) * end;
   scale2 = RecEnd - RecStart + 2 * ncol;
  }
  else{
   RecEnd = nrow*ncol;
   scale2 = RecEnd - RecStart + ncol;
  }
   //receive the buffer
  if(i<NumOfProc-1){   
   MPI_Recv(WaterDir1,scale2,MPI_FLOAT,i-1,5,children,&status);
   int recIndex=ncol;
   for(int n=RecStart; n<=RecEnd; n++)
   {
    outBuf[n] = WaterDir1[recIndex];
    recIndex++;
   }
  }
  else{
   MPI_Recv(WaterDir2,scale2,MPI_FLOAT,i-1,5,children,&status); 
   int recIndex=ncol;
   for(int n=RecStart; n<=RecEnd; n++)
   {
    outBuf[n] = WaterDir2[recIndex];
    recIndex++;
   }
  }
  
 when the Number Of Processes is 2, the program will be OK, But when I change the number of the processes to 3 or 4..  the program will shut down in MPI_Recv . I check the parameter, all the parameter are correct, but the program still shut down at that place....
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