How to pass data between parfeval

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Cai Li
Cai Li 2017-7-29
评论： Cai Li 2017-9-20
I'd like to run two jobs on the background using parfeval while I hope they can communicate between each other by passing the data from one job to another. For example, job A generates a data and the job B receives it. How should this work out?

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Walter Roberson
Walter Roberson 2017-7-29
Possibly a pollable queue https://www.mathworks.com/help/distcomp/send.html -- but I cannot tell from the documentation whether it only works for parfor or if it works for parfeval as well.
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Walter Roberson
Walter Roberson 2017-7-31
If you look at DataQueue and PollableDataQueue https://www.mathworks.com/help/distcomp/parallel.pool.dataqueue.html they say,
"You can construct the queue on the workers and send it back to the client to enable communication in the reverse direction. However, you cannot send a queue from one worker to another. Use spmd, labSend, or labReceive instead."
You would need to use the client as the switchboard for this to work.
For worker-to-worker communications you would need labSend / labReceive. You might also be able to use MPI; see https://www.mathworks.com/matlabcentral/linkexchange/links/840-parallel-programming-with-mpi
Cai Li
Cai Li 2017-9-20
Hi Walter,
Thanks for your comments. Sorry for such late response, took some time to write the code. I tried using client as a switchboard while I think it simply cannot pass data from client to the worker through queue. As for labSend and labReceive, I think it doesn't work in perfeval. For some reason, I have to use perceval to run my script on the background. Instead, I figured out a way to pass the data by simply saving it to a file in one worker and reading the file in another worker, which is surprisingly fast (at least for me) Thank you!

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