1. 17-April-2007 High Performance Computing Basics April 17, 2007 Dr. David J. Haglin

2. 17-April-2007 Outline  What is the HPC?  Where did it come from?  How can you get an account on hpc.mnsu.edu?  How can you use it for your research?  Where do you go from here?

3. 17-April-2007 What is the HPC?  Many AMD Opteron Computers (nodes) in a rack  Connected by a high- speed network  In the IT Services Secure area (third floor of the library)  All nodes run linux  http://www.mnsu.edu/hpc

4. 17-April-2007 What is the HPC?  Head node has 8GB RAM; 7.4 TB of Disk  Head node is for doing administrative work and starting long jobs  The 34 Worker nodes are for doing long computations  Each worker has 8GB RAM; 80 GB Hard Disk; 2 dual-core AMD Opteron Head Node Worker 1 …Worker 34

5. 17-April-2007 What is the HPC?  Software Installed: <GNU languages: C/C++ (gcc/g++), Fortran (gfortran) <Message Passing Interface library OpenMPI  Software soon to be installed: <MATLAB <Fluent <Portland Group Fortran and C/C++ <IMSL  Email is “local delivery only”

6. 17-April-2007 Where did it come from?  National Science Foundation Grant <MRI Program (Major Research Instrumentation) <$140,000 <Institutional Equipment funds upgraded machine by adding five nodes  PIs: Patrick Tebbe, Rebecca Bates, David Haglin  Proposal focused on a college-wide need for HPC  Vendor: PSSC Labs, Inc.

7. 17-April-2007 How can you get an account?  We must submit a final report to NSF after July 31, 2009  Part of the final report must include how much it was used within CSET (and within MSU).  We need to track usage (research projects).  To get an account, send an email to haglin@mnsu.edu with information as described:haglin@mnsu.edu <http://www.mnsu.edu/hpc/accounts.htmlhttp://www.mnsu.edu/hpc/accounts.html <Your students can get accounts too!  We are very interested in knowing about publications you obtain as a result of using hpc.mnsu.edu.

8. 17-April-2007 Your Research  Okay, so you got an account.  Now What?

9. 17-April-2007 Your Research  Learning to use HPC.  Learning to use the OpenPBS/Torque job queuing software.  Learning to “design” your usage.  Tutorials will be maintained at www.mnsu.edu/hpc www.mnsu.edu/hpc

10. 17-April-2007 Your Research  Connect to hpc.mnsu.edu (head node) using ssh <ssh on unix <PuTTY or SSH Windows Client (IT Services) <Firewall is pretty tight, may need to request a new opening in the firewall from your location  Line-mode (command-line) interface  Basic unix commands: <http://www.mnsu.edu/hpc/tutorials/linux_basics.doc

11. 17-April-2007 Your Research  Disks on hpc:

12. 17-April-2007 Your Research  Using OpenPBS/Torque job queuing software: <qstat -- Inspect current job queue <qsub -- Add a new job to the queue <qdel-- Delete one of your jobs from the Q <pbsmon.py-- See the state of the entire machine <xpbsmon-- Uses X11 to display machine state <firefox localhost/ganglia  Detailed information available at: <http://www.clusterresources.com/torquedocs21/users manual.shtmlhttp://www.clusterresources.com/torquedocs21/users manual.shtml

13. 17-April-2007 Your Research  Designing your usage. <Assume you have a program you want to run for different parameter values of 1 through 1000 <Ex: $ myProgram -p1 $ myProgram -p2. $ myProgram -p1000

14. 17-April-2007 Your Research  Create 1000 “start scripts” to queue 1000 jobs to the master queue.  Start your jobs and monitor their progress  Combine results when they are all done.  Organize experiments/runs in folders  Use scripting languages such as python to generate start scripts.

15. 17-April-2007 Your Research  Input and Output for your jobs: <Your script will start on a worker node <You can log in to a worker node to see filesystem:  ssh n04  df <Standard Output and Standard Error are separate <Files are written alongside your script when jobs completes <No way to monitor progress of your computation

16. 17-April-2007 Your Research  Sample script to run from 501 to 505:

17. 17-April-2007 Where do you go from here?  www.mnsu.edu/hpc is a communication portal www.mnsu.edu/hpc  Find colleagues who can help  Learn more about the capabilities: <New software <Parallel programming (MPI) <Parallel libraries: e.g., ScaLAPACK.  Keep this machine computing fast  Other ideas?