Edric Ellis
MathWorks
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Developer at MathWorks, working on Parallel Computing Toolbox. Professional Interests: parallel computing, distributed arrays, gpu
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Feeds
Error message in the console when using batch
As mentioned by @Walter Roberson you can use the Diary property of the job to view this information. Another (more intrusive) op...
9 days ago | 0
saving a job.parallel object
It is not supported to save job / task objects themselves - the expected workflow is that you use parcluster to get back your jo...
9 days ago | 0
| accepted
Setting global variables independently on each worker for parallel computation
You can modify the global workspace of a parallel pool worker, but you cannot do it directly within the body of an spmd block or...
9 days ago | 0
| accepted
Error using Parfor "Unable to classify the variable 'Sort'"
I just came here to mention that we tried to improve the error reporting for this case. Here's what happens now, hopefully it ma...
17 days ago | 1
parfor unable to classify, why?
By the way, just wanted to mention that we attempted to improve the message for this particular error case. Hope it makes sense....
17 days ago | 1
Distributed and spmd not running faster
You're not missing anything. If you're only using the cores on your local machine, distributed is unlikely to be much use to you...
20 days ago | 1
| accepted
Li-ion battery calibration - Not able to disable parallel computing
The doc page you reference https://uk.mathworks.com/help/autoblks/ref/battery.pulsesequence.estimateparameters.html states that ...
1 month ago | 0
Displaying a struct containing gpuArray fields takes an extremely long time in R2024b
Thanks for reporting this, I can reproduce the problem here (though not so severely). For now I'm afraid the only workaround is ...
1 month ago | 0
| accepted
Is there a faster method than parfor?
There's quite a bit going on here, and without seeing the details of modifyArray, it's hard to know exactly what to suggest to m...
2 months ago | 0
How does a local parpool manage path per worker?
Workers in a local parallel pool inherit their MATLAB path (and current working directory) from the MATLAB client. However, if y...
2 months ago | 0
| accepted
Did the default NumWorkers change for a local pool in R2024a?
Check the answer here: https://uk.mathworks.com/matlabcentral/answers/2062522-how-does-parallel-computing-toolbox-handle-perform...
7 months ago | 0
| accepted
parpool memory allocation per worker
Further to the other suggestions here, using parpool("Threads") will use less memory than parpool("Processes"), but not everythi...
7 months ago | 0
How to resolve warning message about broadcast variable while using 'parfor'?
I think you should ignore this message in this case. It looks like you really need all the values of males for each iteration of...
7 months ago | 0
| accepted
parfor problems (structure, reduction assignment, etc)
The problem here is that you're trying to extend the arrays like Ball by assigning off the end of the current size of the array....
8 months ago | 0
| accepted
Cancel parfeval causes workers to throw errors
My guess is that whatever myFunc is doing is not safe against being interrupted with CTRL-C. When you cancel a parallel.Future, ...
8 months ago | 0
How to run multiple functions simultaneously and communicate with each other?
Your spmd block as written instructs each worker to run first aData() and then bData(). This is the general pattern of spmd - al...
8 months ago | 1
Error when running function with batch()
This is nothing to do with batch, and everything to do with workspace transparency. Basically when a parfor loop exists inside a...
9 months ago | 0
| accepted
FFT is suddenly slow down for repeated operations.
This is due to the asynchronous nature of gpuArray operations. Where possible, operations on the GPU are queued up and run in th...
9 months ago | 2
| accepted
generalizedInverseKinematics in a nested parforloop
You haven't given us a lot to go on there, but the form of assignment you mention is only valid if qWaypoints is a parfor "tempo...
10 months ago | 0
| accepted
How can I know which worker performs each iteration of the parfor loop?
You can use getCurrentTask (if you're using a process pool rather than a thread pool). This has a field ID which tells you which...
10 months ago | 0
Multiply tall array with array
You need to use a bit of a trick to construct the colon vector. (This trick is alluded to on this doc page). Basically, you need...
10 months ago | 0
How to output variables properly from a parfor loop
For your first case, you could use a parfor "reduction variable". Like this: loops = 10000000; b = []; parfor ii = 1:loops ...
10 months ago | 0
| accepted
Parallel tool (parfor) and COM objects
The general approach to fixing cases where a variable is needed inside parfor, but cannot be directly sent there, is to use para...
10 months ago | 0
Problem working with parfor
That stack frame in the profiler is simply where your MATLAB client is waiting for the workers to complete their work. You can g...
10 months ago | 0
| accepted
Updating a parallel.pool.Constant within a parfor loop
You can't directly update the Value of a parallel.pool.Constant inside a parfor loop - not least because the parfor constraints ...
10 months ago | 0
| accepted
Interference in parfor when using global variables
Separate workers have their own completely separate global workspaces. If the function that you call from parfor first assigns a...
11 months ago | 0
Parsing files and computing in parfor - GA
When working with a remote cluster parpool, usually Parallel Computing Toolbox is able to work out automatically which files nee...
11 months ago | 0
Parallelize cumulative average algorithm
You can use a parfor "reduction variable" to compute this, with a slight modification which may or may not be significant: dat ...
12 months ago | 0
| accepted
doubts about parfeval memory allocation
If the entire dataset only just fits in memory once, then a better option than readall might be to use partition on the datastor...
12 months ago | 0
| accepted
Error Implementing parfor while creating satellite objects
I'm guessing you are trying to use this with a thread-based parallel pool. I had to add a line to your code to make it work, nam...
12 months ago | 0
| accepted
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