parfor error after compiled

I am testing parfor using a simple code as below

--- matlabpool open 2; parfor i = 1:10 display(i); end matlabpool close;

It does not work after compiled and gives the following error. Does anyone have an idea on this? Thanks for your help

--- Starting matlabpool using the 'local' configuration ... connected to 2 labs. ??? The class "distcomp.remoteparfor" is undefined. Perhaps Java is not running.

Error in ==> parallel_function at 430

Error in ==> Untitled at 3

MATLAB:subscripting:undefinedClass

Answer 1

[Jason Ross]

What is the command line you are using to launch the application?

Can you validate the local configuration successfully (Parallel > Manage Configurations > select local > validate)

If you run the code in MATLAB, does it work?

[Qiang]

Jason,

Thank you for answering my question. This code works in Matlab but does not after compiled. I ran the compiled executable in a command-line window like cmd/PowerShell.

I am using a trial version of parallel toolbox. Do you think that could be a problem. Thanks

Qiang

[Jason Ross]

You might want to take a look at the following examples to make sure you have done the right things to set up the environment:

http://www.mathworks.com/help/toolbox/compiler/f12-999353.html#bsm9wmx

http://www.mathworks.com/help/toolbox/compiler/f12-999353.html#bsh5e8h-1

Answer 2

[James]

I'm using 2011a on a winXP machine. I'm trying the exact same thing using the command window (cmd), but am getting the exact same error. Can the OP explain what was changed or exactly how you compile your code to get the executable to run? I've looked over the links and have followed the instructions to the tee, but still no luck.

My local parallel configuration has been validated. When I run the matlab code, it runs fine. But when I compile it and try to run the .exe file, no dice. I don't think I need to create a job manager configuration since I'm only running on local cores.

The problem seems to be when the executable hits the parfor line in the code. I don't know why it has a problem with that.

Been trying for days to get this working and am pulling my hair out. Any help would be great!

Answer 3

[James]

Here's my code for reference. Compiled.mat is my local parallel configuration saved as a mat file...

clear all
close all
% Set the Parallel Configuration file:
if(isdeployed)
    matfile = 'compiled.mat';
    setmcruserdata('ParallelConfigurationFile',matfile);
end

matlabpool open

parfor ii = 1:8
    disp(ii)
end
matlabpool close

Answer 4

[James]

I figured it out. Turns out I needed to make my code a function before making it an executable. This got rid of the

Error in ==> parallel_function at 430 error.

Hope this little detail helps someone out.