Using the Cray SV1

Use the Cray SV1: Test out our Cray supercomputer,

Run program(s) on the Cray
Compare the performance (using timing - MPI_Wtime()) with using MPI on our lab computers
Example Progams for comparison
- calculatePi.c
- calPiMPI.c
- These two programs use the C function: gettimeofday(&tv, &tz);
Running programs on the Cray SV1
Information on Vector Architectures: our Cray is a Vector computer
EXTRA:
- Use Vectorization processes and Optimization techniques
  See handouts:
  - Introduction to Vectorization and Optimization, North Carolina Supercomputing Center
    - Sample vectorization exercises: (c version), (fortran)
  - Vectorization Sample Code (PDF) for the Cray, - PS version + "ex.c" the sample program
  - "Performance Tuning for Vector Architectures" (PS - view with gv - ghostview)
  - Optimization for Vector Computers(PDF - view with acroread), from Jim Giuliani's workshop
    Optimizing Code on our Cray
- Optimize your MPI code
- Performance Measuring Tools for the Cray: Guide to Parallel Vector Applications:
  - FIRST: In order to view these tools -
    - Sign on to the Cray
    - In this x term, type:
      "setenv DISPLAY yourcomputer.tjhsst.edu:0.0"
      (Note, on a "bash" system, this is
      "export DISPLAY=yourcomputer.tjhsst.edu:0.0")
    - Open another x term (logged on to your computer, not the Cray)
    - In this second x term, type:
      "xhost + cray.tjhsst.edu"
  - ATExpert
  - Using the X Window Interface
  - flowview
  - Hardware Performance Monitor (hpm)
  - jumpview
  - perfview
  - procview
  - Hardware Performance Monitor Counters