OpenMP Lab01 CRAY SV1 Introductory Programs

• Fortran Documentation (Sun WorkShop Compiler Fortran documentation)
• Fortran 77 tutorial
• Fortran Language Reference Manual Vol. 1 for the Cray SV1
• Fortran Language Reference Manual Vol. 2 for the Cray SV1
• Fortran Language Reference Manual Vol. 3 for the Cray SV1

Assignment

1. Look over the Index and Introduction sections of this OpenMP Tutorial

2. Compile and run parallel.f (Fortran!)
   • On the SV1: f90 -o parallel parallel.f -ffree
     (-ffree means free form syntax)
     (You can also use "ftn", there is a "man ftn")
   • To change the number of threads:
     • In bash: export OMP_NUM_THREADS=12 (for 12 threads)
     • Not in bash: setenv OMP_NUM_THREADS 12 (no = sign)

3. Compile and run reduction.f
   • Explain what is happening, what is this "reduction" doing?

4. Compile and run dodir.f
   • Note what is happening to the array indexes in each thread
   • Print out the values of array B after the parallel loop.
   • What are the following intrinsics:
     • RANDOM_NUMBER()
     • MAXVAL()
     • MAXLOC()
   • What is this program doing?

5. Adapt your matrix multiply algorithm to this parallel loop