Howto OG matlab tutorial

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Revision as of 09:58, 10 October 2013

Assume that I have matlab script that I want to start. All files for this example are stored in /home/sporring/test_officegrid.

The matlab script is called mytestscript.m and looks like this:

 % This script is for testing Office Grid
                                                                               
 for i=1:10
   i
   X=ones(1,268435456); % Allocate 2 GB of memory
   pause(3)
   clear X;
 end
                                                                               
 % Remember to use absolute paths when reading and writing files. Like this
 X=10;
 save('data.mat','X');
 clear all;
 load('data.mat');
 X
                                                                               
 % Remember to call exit at the end of your matlab script (this is a problem
 % with our current matlab installation, ver. 7.3.0.298)
 exit();

My program, mytestscript.m, on the server is located in /home/sporring/test_officegrid. In order to setup the environment and start matlab I have made a script called run.sh:

#!/bin/sh

cd /home/sporring/test_officegrid;
/usr/local/bin/matlab -nodesktop -nojvm -nosplash -logfile matlab.out -r mytestscript

After creating this file, you should make it executable as a script by:

 chmod u+x run.sh
                                                                             

Now we are ready to start the script as an OG job. Login to imagediskserver3 (192.168.10.103) and using the command line interface do the following:

 og_shcmd -i -p linux /home/sporring/test_officegrid/run.sh

If you do not specify the walltime of the script it will stop your script after 1H. To ensure that the program will run for at least 1 day, use

 og_shcmd -i -w 1:0:0:0 -p linux /home/sporring/test_officegrid/run.sh

The program runs and writes all matlab output in matlab.out, and reads a file called data.mat.

See section below on how to read back the text output from stdout and stderr. Or try to do:

 og_res -i <job_id>

Which should print the text output from your matlab script.