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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...

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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...

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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 ...

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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...

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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...

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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 ...

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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...

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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...

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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...

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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 ...

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

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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...

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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...

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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...

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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...

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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...

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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...

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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...

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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...

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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...

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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...

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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...

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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...

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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...

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How to create data file and copying data on it for parallel programing in MATLAB?
You are quite right that trying to write to the same file from multiple workers will cause problems. Here's one way that you cou...

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How do you remove rows from tall arrays?
As the error message states, the only way to remove specific rows from a tall array is with a logical vector. In other words, th...

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"parameter {0} must be a real scalar" error when using parfor
I think you need to use createConnectionForPool to make your database connection object and have it work correctly inside your p...

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How to let a lab tell if another lab is idle or not in a spmd block at that time : isidle(labindex)
I can think of a few ways around this: As you suggest, labProbe can tell you if there's an incoming message ready to be receive...

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When I use parfor in the program, the program seems to fall into an endless loop in the remoteparfor.m file, resulting in the program's delay in output.What's going on?
The file "remoteparfor.m" is part of the implementation of a parfor loop. The main job of this piece of code is to wait for resu...

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reproducible and independent random stream generation in parfor loop
This topic is covered here in the documentation. You should not mix setting 'Seed' with setting 'Substream'. (The 'Seed' value s...

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