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running Multiple COMSOL server and Matlab parallel
Posted 20.02.2020, 19:10 GMT-5 LiveLink for MATLAB Version 5.4 4 Replies
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Dear all, I want to speed up my computations using the parfor loop in MATLAB. Therefore, I called 5 comsol server and use 5 workers in Matlab to connect these comsol servers. Below is the run.sh which called the comsol servers:
#!/bin/sh
#BSUB -q mpi
#BSUB -n 24
#BSUB –o %J.out
#BSUB –e %J.err
killall -9 comsollauncher java
sleep 15s
comsol server -np 1 -silent -port 1036 -tmpdir temporary_files1 &
comsol server -np 1 -silent -port 1046 -tmpdir temporary_files2 &
comsol server -np 1 -silent -port 1056 -tmpdir temporary_files3 &
comsol server -np 1 -silent -port 1066 -tmpdir temporary_files61 &
comsol server -np 1 -silent -port 1076 -tmpdir temporary_files81 &
sleep 60s
matlab -nodisplay -r three_D_aquifer_HPTT_parallel
It seems that when I only use one comsol server, this worked well. But when I use 5 comsol server, it will produce the error like:
java.lang.RuntimeException: Error initializing storage.
......
Caused by: java.io.FileNotFoundException: /share/home/shixq2/.comsol/v54/configuration/comsol/org.eclipse.osgi/.manager/.fileTableLock (No such file or directory)
......
Do you have any suggestions how to make this work?
Thank you in advance!
Xueyuan
Hello Xueyuan Kang
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Xueyuan,
I've been working on doing the same as you. I've been able to get this to work by following hints on this comsol forum - https://www.comsol.com/forum/thread/33446/parallel-computing-matlab-comsol. They start Comsol servers within a parfor loop, and then connect each individual parfor worker to a server with the "mphstart" function.
I hope this helps. If you need an example, please let me know.
Alex
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Hi, Xueyuan,
I've been working on doing the same as you. Have you solved your problem? In addition to the url that Alex mentioned, another url - http://cn.comsol.com/forum/thread/38557/parallel-computing-with-matlab-livelink-and-comsol?last=2013-07-20T17:37:08Z mentioned a similar solution. But for me, there are still mistakes. for example, when i used the code in the runfile,:
core=2; pp=parpool(core); comsolPort1 = 2036; system( ['D:\COMSOL\COMSOL55\Multiphysics\bin\win64\comsolmphserver.exe -np 1 -port ' num2str(comsolPort1) ' &'] ); pause(1) comsolPort2 = 2037; system( ['D:\COMSOL\COMSOL55\Multiphysics\bin\win64\comsolmphserver.exe -np 1 -port ' num2str(comsolPort2) ' &'] ); pause(1)
and the next code in my function contains my Comsol model :
cd('D:\COMSOL\COMSOL55\Multiphysics\mli') comsolPort=[2036 2037]; t = getCurrentTask() labit=t.ID mphstart(comsolPort(labit))
The calculation of the first round can be performed, but an error will be reported when the second round begins: Error using mphstart Already connected to a server
I thought the first-round model was still occupying ports, so I added the statement "Modelutil.disconnect;", but the calculation again prompted an error: Error using mphstart A connection to COMSOL could not be established. Please check that a COMSOL server is started prior to calling mphstart
I'm confused. Is there anything else to deal with ?
Weikai Xu
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Xueyuan,
I've been working on doing the same as you. I've been able to get this to work by following hints on this comsol forum - https://www.comsol.com/forum/thread/33446/parallel-computing-matlab-comsol. They start Comsol servers within a parfor loop, and then connect each individual parfor worker to a server with the "mphstart" function.
I hope this helps. If you need an example, please let me know.
Alex
Dear Alex
I am in exactly the same situation as Xueyuan. May I ask how are you solved the problem? In addition to the url that you mentioned, another url - http://cn.comsol.com/forum/thread/38557/parallel-computing-with-matlab-livelink-and-comsol?last=2013-07-20T17:37:08Z mentioned a similar solution. But for me, there are still mistakes. For example, when i used the code in the runfile,:
core=2; pp=parpool(core); comsolPort1 = 2036; system( ['D:\COMSOL\COMSOL55\Multiphysics\bin\win64\comsolmphserver.exe -np 1 -port ' num2str(comsolPort1) ' &'] ); pause(1) comsolPort2 = 2037; system( ['D:\COMSOL\COMSOL55\Multiphysics\bin\win64\comsolmphserver.exe -np 1 -port ' num2str(comsolPort2) ' &'] ); pause(1)
and the next code in my function contains my Comsol model :
cd('D:\COMSOL\COMSOL55\Multiphysics\mli') comsolPort=[2036 2037]; t = getCurrentTask() labit=t.ID mphstart(comsolPort(labit))
The calculation of the first round can be performed, but an error will be reported when the second round begins: Error using mphstart Already connected to a server
I thought the first-round model was still occupying ports, so I added the statement "Modelutil.disconnect;", but the calculation again prompted an error:
Error using mphstart A connection to COMSOL could not be established. Please check that a COMSOL server is started prior to calling mphstart
I'm confused. Is there anything else to deal with ? Could you please kindly share your solution here? Looking forward to your reply very much, Thank you!
Kind regards, Weikai Xu
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Hi, all
The format is correct in my reply box, but I don't know why some Enters disappear after submission. I'm sorry for the trouble to you!
Regards, Weikai Xu