'parpool' fails in deployed application
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I am building a parallel for loop (parfor) based deployed application. I have a parpool command before the parfor loop:
parpool('local', 4);
parfor a = 1:N ....
The code works within MATLAB, but in the deployed application, it errors out at the parpool line:
Error using parpool (line 113)
The specified superclass 'parallel.internal.customattr.CustomPropTypes' contains a parse error,
cannot be found on MATLAB's search path, or is shadowed by another file with the same name.
5 个评论
Nikilesh Chilkuru
2018-11-1
Can you tell me: 1) Which version of Matlab are you using? 2) Are you trying to run the deployed application on the same system?
Vinayak Phalke
2018-11-1
Kevin Chng
2018-11-1
What is your deployed application?MATLAB executable file?
I think you might need to set your parpool profile
However, in documentation, it is for MATLAB Compiler SDK.
Hi Nikilesh Chilkuru,
I would like to know that does MATLAB compiler need to do the same way?
Vinayak Phalke
2018-11-2
Kevin Chng
2018-11-8
Great. That's mean for MATLAB compiler, it need to do the same way as MATLAB Compiler SDK.
回答（4 个）
Kevin Chng
2018-11-8
1 个投票
To use parallel computing for standalone application (MATLAB Compiler SDK/MATLAB Compiler) , you may need to configure/change your code as below:
Kristoffer Walker
2019-6-26
编辑：Kristoffer Walker
2019-6-26
0 个投票
Folks,
It would be great if this answer could be improved. I am having this issue now I believe, but I do not understand what a "local profile" is, how to generate such a settings file, and why I should bundle it for deployment in a completely different remote machine that will have a different number of cores and may not share any similarities with the local profile that was deployed with it. I have read the website links above.
Kris
3 个评论
Kevin Chng
2019-6-26
Hi Kris,
No worries, I think it is working with different PC up to 512 cores, provided it is utilizing the local computing resources. Not cloud/server resources (MATLAB Parallel Server).
How to get the setting files from local profile?
On top of your tab (Home>Parallel>Export)
Then you will get the setting file.
Kristoffer Walker
2019-6-27
编辑：Kristoffer Walker
2019-6-27
Hi Kevin,
By the way, is there a way to have Matlab email me when someone has commented on a post I create? I don't seem to have that option turned on and I'd like to.
I am not using the Matlab Parallel Server. I just have a GUI that has a number of threads parameter. The callback on the nThreads parameter executes a parpool. The problem is that for some choices of nThreads (still below the max number of threads available to Matlab), the deployed version of the GUI will "beep" during the callback. The non-deployed version will not beep. No console errors are observed however. I interpret the beep to be due to parpool encoutering an issue. However, it still registers as reserving the correct number of threads. The callback is extremely simple:
function nThreads_Callback(hObject, eventdata, handles)
% hObject handle to nThreads (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
set(handles.Wavefield,'enable','off');
numCores = str2double(get(hObject, 'string'));
delete(gcp('nocreate'));
if (numCores > 1)
f = waitbar(0,'Creating parallel processing thread pool...');
parpool('local', numCores);
waitbar(0.5, f, 'Creating parallel processing thread pool...');
waitbar(1, f, 'Creating parallel processing thread pool...');
close(f);
end
set(handles.Wavefield,'enable','on');
Kevin Chng
2019-6-28
Hi Kris,
Let me provide some documentation here for your reading:
Similar question has been asked in the past:
I tried it before personally, it is working for deployed application. For your question about :
Different remote machine that will have a different number of cores and may not share any similarities with the local profile that was deployed with it.
Frankly speaking, i'm not sure about it, but i think the local setting file should working for different machine.
follow the documentation to get your local pc work with your deployed standalone application with parallel computing first.
later, we can try to execute the standalone application in different pc. I think it should be working. Let me know, i'm interested to know it as well.
If you still encouter any issue, let me know, then i try spend some time to try it out.
Kristoffer Walker
2019-7-1
编辑：Kristoffer Walker
2019-7-1
0 个投票
Hi Kevin,
So I've looked more carefully at this and created a simple example to demo the problem. Just create a script "testApp.m". Include in it a call to function testAppFunc(), which inside it only does a "parpool(2)". Put some fprintf statements in there for correlation purposes. Then compile it with Application Compiler and test the testApp.exe in for_redistribution_files_only directory by launching from a PowerShell. You will hear the beep. Why does this happen and how can I stop it? This only happens the first time parpool is executed from a deployed app. It does not happen during subsequent calls to parpool in the same instance of the deployed app. It also does not happen in the non-deployed app at any time.
BTW, saving the settings.local file did not help (but thanks for those links to the instructions).
Kris
Stefanie Schwarz
2022-8-9
0 个投票
See the MATLAB Answers post below - it could also just be a problem of running the executable against an incorrect version of MATLAB Runtime:
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