This repository provides Matlab source code to run embarrassingly parallel problems on a HTCondor system.

1. Download or clone the repository.

2. Start Matlab and add the folder matlab_on_condor to your path (using either a right-click in the file manager or using the Matlab command addpath).

3. That's it! You can test if everything is working correctly by running

condor.options('set', 'no_nodes', 10);  
condor.execute('condor.tasks.identity', ...  
               condor.parfuns.identity, ...  
               condor.reducefuns.sum)

from the console. The output should be 55.

The main function of the package is called

condor.execute(funfile, parfun, reducefun)

and takes three arguments:

• funfile (short for function file): A char-array with the path to a file containing a function or the name of a function which should be run on the condor nodes. The task function on the ith node is called with the input arguments defined by parfun(i). The number of nodes can be set by calling condor.options('set', 'no_nodes', <number>) beforehand. Example: If one wanted to run the function foo defined in the file foo.m on the HTCondor system, funfile can be set to either 'foo' (function name) or 'foo.m' (path to file) but neither to @foo (function handle) nor '@foo' (function handle as char-array).
• parfun (short for parameter function): A function handle which takes one integer argument (the job number) and returns a cell array with input arguments with which the function specified by funfile run on the corresponding node number will be called.
• reducefun (short for reduce function): A function handle which takes at least condor.options('no_nodes') number of input arguments and returns one output argument. It will be called with the return values of the function calls on the condor nodes and the return value of the reduce function will be the return value of condor.execute.

There are helper functions available for the construction of parameter and reduce functions. Details can be found in the documentation of the according files.

• Denis Hessel
• e-mail: [email protected]

This project is licensed under the MIT License - see the LICENSE file for details.

• Phong-Minh Timmy Ly for providing me with a starting point on how to use the HTCondor system.