Modeling the Shallow Water Equations with C and MPI

1
Modeling the Shallow Water Equations with C and
MPI
LA-UR-07-6793 Approved for public
release distribution is unlimited

• Bob Robey

2
Setup

• The software is already setup on the computers
• For setup on home computers, there are two parts.
  First download the files from the Supercomputing
  Challenge website for the lab in C/MPI if you
  havent already done that.
• Untar the lab files with
• tar xzvf C_MPI_Wave_Lab.tgz

3
Setting up Software

• Setting up System Software
• Need Java, OpenMPI and MPE package from MPICH
• Download and install according to instructions in
  openmpi_setup.sh
• Can install in users directory with some
  modifications

• Setting up Users workspace
• Download eclipse software including eclipse, PTP
  and PLDT
• Install according to instructions in
  eclipse_setup.sh
• Import wave source files and setup eclipse
  according to instructions in eclipse_setup.sh

4
Lab Exercises

• Change initial conditions to two colliding waves
  with a height of 4 at each end declining to 2 at
  the quarter points.
• Change the number of cells in the x direction and
  observe the impact on the solution
• Try running 1, 2, or 4 processes and time the
  runs. Note that you can run 4 processes even if
  you are on a one processor system.
• Switch to PTP debug perspective and try stepping
  through the program