Running Programs on the Cray SV1, Spring 2004

1. ssh cray
   (or "ssh cray.tjhsst.edu" from remote)
2. bash
   (this runs a version of bash - "bourne again shell" - easy interface you're used to)
3. look around: "ls" lists files, "pwd" shows the directory path
4. "mkdir directory" creates working directories if you need them
   cd directory - changes directorie
5. To transfer files from our lab to the SV1:
   • Open another x-term (terminal)
   • ftp cray
     "put file" transfers your file from our lab to the SV1
     Note: you can use "ls", "cd" inside ftp
   • BETTER: use "gftp" - this provides a ftp with window interface
6. Editing programs
   • emacs filename
     • CTRL x CTRL s
       saves your file, no exit
     • CTRL x CTRL c
       exits emacs, asks if you want to save
     • CTRL x CTRL h
       Gets a preliminary help file
       q - quits the help
       t - gives you a tutorial
       space bar scrolls
   • vi filename
     • You start out in "command" mode
     • : linenumber
       goes to a line number
     • :i
       Enters "insert" mode - use this mode to type into your file
       :a is similar, appends to the end of a line
     • ESC
       goes back to "command" mode
     • In command mode:
       x - deletes one char
       dd - deletes one line
     • :w saves the file
     • :wq saves and quits
     • :q! quits without saving
7. C
   • cc -o filename filename.c ("-o filename" generates the output/executable file)
   • ./filename (runs the executable)
8. C++
   • CC -o filename filename.cpp
   • ./filename (runs the executable)
9. Fortran 77
   • f90 -o filename filename.f
   • ./filename (runs the executable)
10. MPI (SV1 has the C version only)
    • cc -o filename filename.c
    • mpirun -np 4 filename
      (runs the executable with 4 processes, "np" = number of processes)
    • mpirun -nt 4 filename
      (runs the executable with 4 tasks, "nt" = number of tasks,
      tasks use shared memory, may be faster than processes)