Supercomputer Applications
Project Group #1B, Fall 2003

1. MPI (Message Passing Interface) Programs, Parallel Programming
   Labs 00, 01, 02, (and 03) DUE Fri. Nov. 7, 2003
   Lab 03 will be due 2nd quarter
   • MPI Program Lab00, "HelloCluster.c"
     MPI_Init(), MPI_Comm_size() , MPI_Comm_rank(), MPI_Finalize() MPI_COMM_WORLD (scroll down to "Communicators")
   • MPI Program Lab01, share.c
     --Input a number with scanf, broadcast this value to other nodes in the "lamhosts" file
     uses MPI_Bcast(), also see MPI Data types
     NOTE: Place the call to MPI_Bcast outside of the "if (rank == 0)" block:

              if (rank == 0) {
     	      scanf( ... );
     	  }
     	  MPI_Bcast( ... );  //MPI_Bcast is like a combination send/receive,
     	                     //so each process needs it
     	

   • MPI Program Lab02, DinnerParty.c
     Use MPI_Send(), and MPI_Recv(), INSTEAD OF MPI_Bcast()
     Sample Output:
     mpirun N lab02
     Process 0, Sending out random int 406999 to process 1
     Process 2 received: 1252750, mysalary=380245, sending out 1632995 to process 3
     Process 3 received: 1632995, mysalary=600007, sending out 2233002 to process 4
     Process 1 received: 406999, mysalary=845751, sending out 1252750 to process 2
     Process 0 received 3014004, mySalary=157838, average salary=$460807.17
     Process 4 received: 2233002, mysalary=618007, sending out 2851009 to process 5
     Process 5 received: 2851009, mysalary=162995, sending out 3014004 to process 0
   • MPI Program Lab03, IntervalSlicing.c - Calculate Pi,
     --parallelize the program "gregory.c"
     Lab03 is for 2nd quarter: DUE Fri. Nov. 14, 2003
     Use MPI_Reduce() to sum data that is local to each process
   
   
2. MPI Resources and Sample Programs
   • Introduction to MPI programming
   • Introductory Slides on MPI, by William Gropp
   • A Short Overview of MPI Concepts, by William Gropp
   • MPI Exercises, Pt.1
   • Intermediate Level MPI programming