How to opening 1 instance of MATLAB from MATLAB, but accessing it multiple times

Question

Ali Razavi 2021-8-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1435767-how-to-opening-1-instance-of-matlab-from-matlab-but-accessing-it-multiple-times

评论： Ali Razavi 2021-8-19

采纳的回答： Raymond Norris

Hello,

I would like to do the followings:

From a MATLAB session, open another instance of MATLAB - which can be done by: !matlab &
Every now and then from existing MATLAB session have a command executed in the other session. This is the part that I do not know how to do. How in existing MATLAB session, I can have a command exscuted on another instance I already opened.

I greatly appreciate your suggestions.

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Ali Razavi 2021-8-17

Thanks for immediate response.

OS: Micorsoft Windows 10 Enetrprise

Raymond Norris 2021-8-17

Does the second MATLAB have to have its Desktop visible to interact with or does it suffice to be running in "headless" mode?

Do you have the Parallel Computing Toolbox?

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Answer 1

Raymond Norris 2021-8-18

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https://ww2.mathworks.cn/matlabcentral/answers/1435767-how-to-opening-1-instance-of-matlab-from-matlab-but-accessing-it-multiple-times#answer_769557

在 MATLAB Online 中打开

Using the Parallel Computing Toolbox, look at parpool and parfeval. parpool will start a N number of "workers" (i.e. headless instances of MATLAB), which can be running either on your local machine (supported out of the box) or on a remote machine (additional work to setup). parfeval offloads execution to a worker. For example

% Initialization: get a handle to the cluster and start a pool of 1 worker
cluster = parcluster;
pool = cluster.parpool(1);
% ... run other code ...
% Spawn command to run on worker
pool.parfeval(@mycode,0,{});

parfeval is non-blocking and can be called whenever you want to offload code. The {} is the input arguements to calling mycode. If you code has input args, assign them into {}.

If your code returns a result, then you'll need to assign it a result so that you can pull the result(s) back. You won't be notified when the code finishes, so you'll need to verify that the state has finished.

f = pool.parfeval(@mycode,1,{});
% ... run other code ...
% Get results
f.wait
result = f.fetchOutputs;

See the doc for parfeval for more information. One consideration is that a pool will expire if not used after a period of time (default is 30 minutes). You can disable this auto-deletion in the parallel preferences.

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Raymond Norris 2021-8-19

在 MATLAB Online 中打开

Correct, use the cancel() method to end the task (not interrupt). For example

>> local = parcluster('local');
>> pool = local.parpool(1);
Starting parallel pool (parpool) using the 'local' profile ...
Connected to the parallel pool (number of workers: 1).
>> 
>> % Run task for 10 hours
>> f = pool.parfeval(@(t)pause(t),0,60*60*10);
>> f.State
ans =
    'running'
>> % Cancel task preemptively
>> f.cancel
>> f.State
ans =
    'finished'
>> 