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Edric Ellis

MathWorks

Last seen: Today Active since 2011

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Answered
pass Python object as argument to function in "parfeval"
One of the limitations of the MATLAB->Python support is that Python objects cannot be serialized. parfeval (and other parallel c...

6 jours ago | 0

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Answered
decomposition in parfor failure
Unfortunately, I think you're hitting the sort of problem that was mentioned in this answer to the question you linked to - the ...

8 jours ago | 1

Answered
How can an infinitely running worker be gracefully terminated?
The simplest way to fix this is to use onCleanup to ensure that your fclose statement is executed. This is good practice anyway,...

14 jours ago | 1

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Answered
How exactly does MATLAB calculate a sum of array elements by its sum() function? Does it use any compensated summation algorithm such as Kahan?
The outtype parameter to sum controls the numeric type used for summation, described in the doc. The default is that sum on sing...

22 jours ago | 0

Answered
How to slice these variables?
I think what you're trying to do is something like this, which doesn't work: N = 4; out = zeros(N, 3); try parfor idx = ...

22 jours ago | 0

Answered
How to store 2D arrays in a for loop inside a parfor loop?
I think you can do this simply by essentially "reshaping" the problem to satisfy the parfor requirement that the index expressio...

27 jours ago | 0

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Answered
Passing a Global Variable to arrayfun for gpuArray
You can do this by using a nested function and variables in the containing parent workspace instead of global variables. Here's ...

27 jours ago | 1

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Answered
Parallel pool constant with a parfor and for loop
Yes, parallel.pool.Constant is generally most useful when there are multiple parfor loops. (There are other use-cases such as wh...

environ 2 mois ago | 0

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Answered
How do I use SatelliteScenario Groundstation objects inside of a Parallel Computing Toolbox parfor loop
Thanks for reporting this problem. You can work around this for now like so: fetchOutputs(parfevalOnAll(@() delete(figure), 0))...

environ 2 mois ago | 0

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Answered
How to create interleaved complex from real gpuArray in mex?
Yes, complex mxGPUArray data is always stored in interleaved-complex format, see this doc page for details.

environ 2 mois ago | 0

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Answered
Fill structure in parallel loop
The main constraint here is the parfor "sliced output" requirement. Basically you cannot directly update a single struct using p...

3 mois ago | 0

Answered
How can i use GPU Computing for Besselk & Besseli function and integral ?
Unfortunately, the Bessel functions are not yet supported on the GPU, so there is no straightforward workaround for this part. I...

3 mois ago | 0

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Answered
parallel processing for readtable function
You've manually disabled the AutoCreate for parallel pools - I presume you're manually creating a pool with a separate parpool s...

3 mois ago | 0

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Answered
How to limit the usage of GPU to only one parallel worker?
You could perhaps do something like this. This assumes your code is running in a parallel pool, and that you have only 1 GPU. s...

4 mois ago | 0

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Answered
Error: Unable to classify a variable in the body of the parfor - loop
This doesn't work as written because the indexing form into pos doesn't meet the requirements for a "sliced" variable. The simpl...

4 mois ago | 2

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Answered
Shared variable / memory usage / parfor
The workers in a "local" parallel pool (the default) are separate processes. Therefore each worker process must have a complete ...

4 mois ago | 1

Answered
What's the proper way to handle GPU related matlab functions in a compiled app that might run on a computer without a supported GPU
You can use canUseGpu to check if a GPU is available. If one is not, then your code needs to not create any gpuArray data.

4 mois ago | 1

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Answered
Parfor loop with 4 workers is more than 4 times faster than the for loop, how is it possible?
Without seeing some code that demonstrates this, we can only speculate. One possibility is that the code transformations require...

5 mois ago | 0

Answered
Matlab parfor uses fewer cores than the allocated number of cores
I bet your parallel pool is timing-out in between your parfor loops. It then gets auto-created with size 12, as that is the defa...

5 mois ago | 0

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Answered
How to use parpool worker again, after it times out?
As @Walter Roberson says, if the wait call times out and you don't want the result, you must use cancel to stop execution. So yo...

5 mois ago | 1

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Answered
Having the error , " the parfor loop cannot run due to the way variable is used".
The parfor implementation thinks you're doing something order-dependent involving a (and b). Here's an example with a similar er...

5 mois ago | 0

Answered
How to handle Complex input in MEX gateway function in CUDA?
Firstly, as per the doc page for interleaved complex data, you need to add the command-line flag -R2018a to use mxGetComplexDoub...

6 mois ago | 0

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Answered
MATLAB Job Scheduler job storage location
If you're referring to the JobStorageLocation property of the parallel.Cluster object you get back from parcluster - you do not ...

6 mois ago | 0

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Answered
Matlab and SPICE toolkit and parfor
I know nothing about SPICE, but at a guess, you probably need to initialise SPICE on the workers. I would try adding fetchOutpu...

6 mois ago | 0

Answered
Is it possible to build a parfor loop where workers share and edit (only) one variable array?
If I've understood correctly, you could use spmd to do something like this. spmd allows communication between the workers, so th...

6 mois ago | 0

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Answered
How can I run my own CUDA code?
To call the kernel, you must first set up the ThreadBlockSize and GridSize properties of k. See this page for more https://www.m...

6 mois ago | 0

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Answered
How much parallelism can I get out of 32 workers?
If your workloads are amenable to MATLAB's intrinsic multi-threading, then you could run 32 multithreaded workers, each of which...

6 mois ago | 1

Answered
Parallel Computing Maximize CPU Usage
There are several reasons why parfor may not be able to do a perfect job of speeding up your calculation. These basically boil d...

7 mois ago | 0

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Answered
Is it possible to control two Arduino boards in parallel using parfor?
As @Walter Robersonpoints out, you need to create the arduino objects directly on the workers. Rather than using parfevalOnAll t...

7 mois ago | 0

Answered
Can't use gpuArray with melSpectrogram
gpuArray support for melSpectrogram was added in R2020a. See the release notes.

7 mois ago | 1

| accepted

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