Discussion Forum

January 31, 2013 3:19pm UTC in response to Anders Gudmarsson

Re: Parallel computing MatLab Comsol

Hi Anders,

Were you able to solve this problem?

Hi,

I am trying to do the following

parfor k=1:20
model2 = mphload('micromodel');
end

This should initiate several parallel comsol instances in matlab. However, I get the following error

Error using parallel function
Undefined variable "ModelUtil" or "ModelUtil.load"

However if I do this in serial:

parfor k=1:20
model2 = mphload('micromodel');
end

it works fine.

Thanks,

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February 5, 2013 5:03pm UTC in response to Anders Gudmarsson

Re: Parallel computing MatLab Comsol

Hi Anders,

Thanks for your reply. I am able to launch comsol on the workers, however, they are not able to finish off normally. Somhow they end up crashing.

Can you tell me if you use labBarriers, LabSend and LabReceive commands to communicate from the parent process to the worker processes?

Also, would I be right in making the parent do the writing to the files etc. and just get the data from the child processes?

Thanks,

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February 13, 2013 9:50am UTC in response to Julian Freed-Brown

Re: Parallel computing MatLab Comsol

Hi,

Here is a sample code of my solution to this problem.
I use the system command to start comsol and then i call my comsol functions in the parfor loop.


matlabpool open 2
comsolPort = 2036;
system( ['comsol -np 1 server -silent -port ' num2str(comsolPort) ' &'] );
pause( 6 )

comsolPort = 2037;
system( ['comsol -np 1 server -silent -port ' num2str(comsolPort) ' &'] );
pause( 6 )

parfor i = 1:2
if i == 1
y_acc_amp_final{i}=Torsion(dataT,f_range);
else
x_acc_amp_final{i}=Long(dataT,f_range);
end
end

matlabpool close


In my comsol functions i use the mphstart command to connect the functions to the opened comsol ports.


cd('C:\Program Files\COMSOL43\mli')
mphstart(2036)


I hope this may be helpful.

Regards,
Anders

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