Running C, C++, and MPI Programs on the Cray SV1

1. ssh cray

2. enter the password - "a" + student number

3. To copy the necessary files from your regular account use ftp:
   • ftp cray, enter your password
   • "put file.c"
   • "ls" - this will list the files in your directory on the Cray
   • "bye" - exits ftp

4. Compile your program:
   • For c: "cc -o filename filename.c"
   • For C++: "CC -o filename filename.cpp"
   • Fortran 90: "f90 filename.f90" or "f90 -o filename filename.f90"
   • Without the -o option creates an executable as a.out

5. Run mpi:

   • mpirun -np 5 file (we have up to 16 processors you can use)
6. Editing your files - Use emacs or vi, otherwise edit on your workstation

7. To Run C/C++ on the Cray SV1:
   1. cc -o filename filename.c -O 3
   2. The "-O 3" above optimizes the C compiler
   3. C++: CC -o filename filename.c -O 3
   4. running the program: filename (this runs the executable)

8. To compile and run an MPI program: (only C or Fortran MPI programs will work)
   1. compile your MPI program: cc -o myprog myprog.c
      This creates an output, executable file called "myprog"
   2. Run your MPI program: mpirun -np 5 myprog
      This runs myprog with 5 processes

9. Put these results on your portfolio webpage:
   • Include a description what you've done, which program(s)
   • Screenshot(s) of your output of running programs on the Cray
   • Links to code that you ran on the Cray (try to save a copy as "txt" -
     this makes it easier to load and view in a browser)