Edric Ellis

MathWorks

Last seen: Today | Actif depuis 2011

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

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parfor with temporary variable worning
I think there are a couple of problems here. Firstly, I think you need to change the way you're assigning into dcm_stack because...

5 jours il y a | 0

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Can parfor be used if no Parallel Computing Toolbox licenses are available?
The implementation of parfor is intended to gracefully fall back to running in serial if a Parallel Computing Toolbox licence ca...

8 jours il y a | 0

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Slicing variable in parfor loop
In this case, you don't actually have a data dependency between the loop iterations. You can use a parfor reduction to do this, ...

11 jours il y a | 0

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GPU0 and GPU1 in matlab?
GPU Computing in MATLAB supports only NVIDIA devices, so your Intel graphics card cannot be used by gpuArray.

12 jours il y a | 1

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Sliced Variables in N Choose K Search
This is a limitation of the parfor analysis when it comes to indexing sliced variables in a nested for loop. There is another wo...

13 jours il y a | 0

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Use Parfoor Loop for Parameter Sweep Optimization
You can do this using a custom reduction function in parfor. Like this: p = 1:10; someFcn = @sin; % Use a 2-element vector to...

19 jours il y a | 2

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SMPD block getting stuck and not executing
I suspect the problem here is that the way that you're using spmdSend and spmdReceive doesn't quite match how they work. When yo...

21 jours il y a | 0

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How can I Ensure Transparency in parfor-Loops when using cell2table ?
Most of the table-building functions can have this problem if you do not specify 'VariableNames', like this (tested in R2019a): ...

21 jours il y a | 2

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Parrallel run using parfor and institute server?
The problem with converting the outer loop to parfor is described in the error message that you get when you try: Error: When i...

environ 2 mois il y a | 0

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Incompatible indexing of variable for parfor
The total size in bytes of Network is 5*12*76*8 = 36480. That is tiny. Ignore the parfor "broadcast" warning - that is intended ...

2 mois il y a | 0

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Minimum/maximum CUDA Toolkit requirement for R2022a
To run code using gpuArray, you do not need to install a CUDA Toolkit. You only need a CUDA driver. You should always* install t...

3 mois il y a | 0

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Is there an easy way to find out which workers are running on the same host in a Generic Cluster job so I can efficiently allgather?
You can use gop to perform general MPI-style all-reduce operations, and a special case of that is gcat which can operate as an M...

3 mois il y a | 0

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Unsure why parfor loop does not work in this case
The problematic variables appear to be both M and P. For M, you have multiple different "reads" from the variable after the init...

3 mois il y a | 0

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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...

4 mois il y a | 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...

4 mois il y a | 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...

4 mois il y a | 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...

4 mois il y a | 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...

4 mois il y a | 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...

4 mois il y a | 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...

5 mois il y a | 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...

5 mois il y a | 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 ...

5 mois il y a | 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...

5 mois il y a | 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...

5 mois il y a | 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 ...

6 mois il y a | 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...

6 mois il y a | 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...

6 mois il y a | 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...

6 mois il y a | 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 ...

6 mois il y a | 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)

6 mois il y a | 1

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