PHYCS 6730 Lab Exercise: Introduction to Parallel Computing

Exercise 1. Logging in to icebox

We will be using the Beowulf cluster icebox.chpc.utah.edu. Log in to your account on that machine using ssh, the secure shell remote login utility:

  ssh icebox.chpc.utah.edu -l <username>

If your username is the same on both machines, you don't need to specify it here.

Change your password immediately.

Nothing to hand in.

Exercise 2. Transferring files to icebox

Copy the files hellompi.cc, Makefile, and hello.pbs from the directory ~p6730/exercises/mpi to icebox using the scp utility. You may have to run this command on icebox, pulling files in from the physics machines. For example, do

  scp <username>@physics.utah.edu:~p6730/exercises/mpi/hellompi.cc .

You will be prompted for your Physics password. Look at the code.

Nothing to hand in.

Exercise 3. Compiling the code on icebox.

Use the Makefile to compile hellompi.

Nothing to hand in.

Exercise 4. Running the code interactively on icebox.

Try to get four interactive nodes for ten minutes on icebox using the following command:

   qsub -I -l nodes=4,walltime=10:00

If you succeed, cd to the directory containing the compiled code and run it using the command

   mpirun -np 4 -machinefile $PBS_NODEFILE hellompi

Hand in your output.