Edric Ellis

MathWorks

Last seen: 2 days 前 | 自 2011 起处于活动状态

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Developer at MathWorks, working on Parallel Computing Toolbox. Professional Interests: parallel computing, distributed arrays, gpu

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已回答
How to perform the inverse operation of "spmdCat" in parallel computing
A "scatter" method isn't exposed directly, but you can achieve the same thing using the codistributed constructor, like this: s...

21 days 前 | 0

已回答
parallel computing for an image stack
I'm not sure exactly what you're after here, but note that the gpuArray implementation of fft2 automatically applies to "pages" ...

1 month 前 | 0

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已回答
How do I import cluster profiles without access to a GUI?
You can use parallel.importProfile to do exactly this from within MATLAB on the server. You can't currently run cluster profile ...

1 month 前 | 0

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已回答
MATLAB 2024 default number of threads
You can change the maximum number of workers to use with a thread pool by modifying the NumWorkers property in the "Cluster Prof...

1 month 前 | 0

已回答
How can I create a singleton object that is processed in parallel threads and processes?
I think your solution is heading in the right direction. Using a DataQueue is exactly what I'd suggest for getting the log messa...

1 month 前 | 1

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已回答
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...

2 months 前 | 0

已回答
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...

2 months 前 | 0

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已回答
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...

2 months 前 | 0

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已回答
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...

3 months 前 | 1

已回答
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....

3 months 前 | 1

已回答
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...

3 months 前 | 1

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已回答
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 ...

3 months 前 | 0

已回答
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 ...

3 months 前 | 0

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已回答
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...

4 months 前 | 0

已回答
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...

4 months 前 | 0

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已回答
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...

9 months 前 | 0

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已回答
parpool memory allocation per worker
Further to the other suggestions here, using parpool("Threads") will use less memory than parpool("Processes"), but not everythi...

9 months 前 | 0

已回答
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...

9 months 前 | 0

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已回答
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....

10 months 前 | 0

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已回答
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, ...

10 months 前 | 0

已回答
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...

10 months 前 | 1

已回答
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...

11 months 前 | 0

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已回答
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...

11 months 前 | 2

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已回答
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...

12 months 前 | 0

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已回答
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...

12 months 前 | 0

已回答
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...

12 months 前 | 0

已回答
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 ...

12 months 前 | 0

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已回答
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...

12 months 前 | 0

已回答
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...

12 months 前 | 0

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已回答
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 ...

1 year 前 | 0

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