Minnesota Supercomputer Institute

Regatta (IBM Power4) Quickstart Guide

This guide will provide you with the basic information needed to get up and running on this machine. For detailed operations information, see the detailed user manual.

How to login

You can only login to the interactive node, which is one of eight-processor p655 nodes. This node is used for compiling and job submission. To run on the nodes of the Power4 system, you have to submit your job to the queue.

To login:

ssh -X -l username regatta.msi.umn.edu

You only need to use -l if your login name is different than the login name you use on your own workstation.

How to compile code

IBM C and FORTRAN compilera are availaable on Power4. FORTRAN codes can be compiled using xlf or xlf90 for serial codes and mpxlf and mpxlf90 for MPI parallel codes. For C and C++ codes, xlc and xlC and be used for serial jobs and mpcc and mpCC for MPI jobs. Please look at the man page for compiler options, e.g., man xlf, man mpCC, etc. Example compiler commands are also available in the detailed user manual.

How to submit batch jobs to the queue using Loadleveler

We have only one queue for the entire system. You do not need to specify a queue class in your LoadLeveler script. But, you can specify a feature or the type of node that your job will use. Example scripts are available in the detailed user manual. If test.ll is your LoadLeveler script:

llsubmit test.ll

How to monitor the job status

llq

How to cancel/kill/remove my job

Given job_id returned when the job was submitted to the queue:

llcancel job_id