Edric Ellis

MathWorks

Last seen: 1日前 | 2011 以来アクティブ

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

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Writing to .mat simultaneously with parfor loop
Don't attempt to save from multiple workers to the same file, this will sometimes fail (exactly when/how it fails depends on you...

6日前 | 2

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SPMD to process different iteration on different worker
It's not entirely clear to me quite what you're after. You might want for (drange) which spreads the iterations of a for loop ov...

14日前 | 0

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process based parpool: keep the data in the workers
Mike has already suggested looking at parfeval. The other option, which may be appropriate for your problem is to use spmd. This...

25日前 | 0

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GUI program with parfeval
You should be able to cause the GUI to update by using wait in a loop, together with drawnow. A bit like this: while ~wait(thre...

26日前 | 0

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Parfor loops indexing into table rows
There's a few things conspiring against you here. Firstly, parfor analysis doesn't understand how to "slice" table data using va...

27日前 | 1

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Discarded Messages with SPMD and labReceive ... why?
Using conditional receives in this way is not a robust way to get the workers to collaborate - you have an ordering problem that...

27日前 | 0

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How to set a background pool to process-based instead of thread-based
Unfortunately, as you have seen fopen is not yet supported on thread-based pools such as backgroundPool. There is no way to conf...

約1ヶ月前 | 0

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parfeval with fetch not working
You cannot pass database connection objects to workers directly like this. You should use createConnectionForPool . There are ex...

約1ヶ月前 | 2

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How to select GPU when doing thread-based parallel?
Unfortunately, spmd is indeed not yet supported for thread-based pools. Until it is, you can do something like the following to ...

約1ヶ月前 | 1

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Segmentation error during parfor loop (remote linux server)
The crash dump suggests the workers are crashing inside ipqpdense. This problem should be fixed if you upgrade to R2020a or late...

約1ヶ月前 | 0

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Why does the number of workers decrease while running parfor?
The number of workers in a local parallel pool decreases like this only when one of the worker processes terminates (i.e. crashe...

約2ヶ月前 | 0

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valid indices in a parfor loop
There are a couple of ways to work around this. You can either unroll the inner loop, or else make the output matrix 3d so that ...

2ヶ月前 | 0

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Using public class methods and libraries in parfeval()
I suspect the problem here is that when you transfer instances of your ADXL372 class to the workers, they are not getting set up...

2ヶ月前 | 0

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error running lines with parallel computing toolbox,
I suspect you're running MATLAB in a -nodisplay mode, and somwhere inside the code you're using, ParforProgMon is not equipped t...

2ヶ月前 | 0

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Is there a built-in function to validate a class property that should be a cell array?
Rather than a validator, you could perhaps just use the class specification? (In my code below I'm using a function with an argu...

2ヶ月前 | 1

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Parallel pool on function that uses persistent variables
As Walter points out, workers (either threads or processes) do not share persistent variable workspaces. I too cannot find this ...

2ヶ月前 | 0

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What can I do/try to make MATLAB release the GPU after a GPU runtime error?
Use this: reset(gpuDevice)

3ヶ月前 | 1

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Difference between debug parfor loop and run it
Further to Walter's answer, parfor assumes that anything that is not statically provable to be a variable reference must be a fu...

3ヶ月前 | 1

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Error: Unable to classify a variable in the body of the parfor-loop
The problem here is that you've got two different accesses to the variable out. On line 7, you have the valid sliced indexing ex...

3ヶ月前 | 2

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proper use of DataQueue and PollableDataQueue inside of App Designer class?
In this case, the problem is not with your DataQueue - it's actually with the function handle you're passing in to parfeval. The...

3ヶ月前 | 1

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How does an active parpool influence serial / threaded mex computation? (runtime/memory)
Simply: an idle parpool should be doing nothing very much other than sitting there consuming some memory. It should consume only...

3ヶ月前 | 1

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Separating subtables from a larger table by using the variable values in a column
Rather than looping, you might be able to use findgroups and splitapply to do what you need. Imagine you wish to compute the max...

3ヶ月前 | 1

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Shared memory in parfor genetic algorithm
If you're using R2022a or later, you could use ValueStore to allow workers to share values. The main requirement here is for you...

3ヶ月前 | 1

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How to input global variables in function that is in parloop?
Another option is to use parallel.pool.Constant to arrange for the data to be loaded and then accessed. This can be a bit simple...

3ヶ月前 | 1

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How to change the parameter in Mask and run the simulation parallel
Given a simple model like this which has a mask with a parameter named gain_val You need to do something like this: mdl = 'm...

4ヶ月前 | 1

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Setting up parallel computations for a single dataset, as opposed to spmd
This is precisely the sort of thing that parallel.pool.Constant was designed for. You build a Constant once on the client, the d...

4ヶ月前 | 0

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How to work with nested containers.Map()s inside a parfor loop
containers.Map instances are MATLAB handle objects. These get copied to the workers, and so when you try to modify them on the w...

4ヶ月前 | 0

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unable to classify the variable 'F' in the body of the parfor-loop
This use of F creates an order depdency between loop iterations. (You're modifying F on each loop iteration). I'm not entirely s...

4ヶ月前 | 0

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How to repeat/continue iteration of a parfor loop without incrementing the loop counter untill condition is satisfied
It's not entirely clear how your "do something" chooses what to do. I think we need to see a little more detail there. Setting t...

4ヶ月前 | 0

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Parallel Toolbox to write many Excel files: How to assign specific job to Workers?
The function xlswrite is no longer recommended, and you should use writematrix instead. The problem you're seeing is because sev...

4ヶ月前 | 2

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