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Edric Ellis


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MathWorks

846 total contributions since 2011

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

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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...

3 days ago | 0

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

7 days ago | 1

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Answered
how to Parallize independent jobs
It's not clear why you think parfor is not suitable for this case without showing us what you tried and why it doesn't work for ...

10 days ago | 0

Answered
Use Parfor on a greenscreen picture
The comment on your question by @Daniel Pollard is probably the most productive way forward. But to answer your parfor query spe...

14 days ago | 0

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Answered
How to resolve indexing the sliced variable error in the case of for nested with parfor?
The problem here is that the inner loop bounds must be a constant - basically this means that you must compute it outside the pa...

14 days ago | 0

Answered
Running into "not enough input arguments" error when using parfeval on a linux machine (works fine on Mac OSX).
Without reproduction steps that we can try, we can only speculate as to what's going wrong here. My guess is that you aren't pro...

16 days ago | 0

Answered
Tall arrays are not allowed to contain data of type struct
Your code was so nearly working. I made two tiny changes, marked with %###: %% Setup nRowLimit = 100; % Number of records in ...

21 days ago | 0

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Answered
Parfor in Parallel Computing
The run function does not work with scripts containing parfor loops. Simply invoke the script directly by name. If the script is...

23 days ago | 0

Answered
How to set timeout to a function
You could use parfeval to do this, but I'm not sure how you might fit that in with the rest of your parpool usage. Here's the si...

25 days ago | 0

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Answered
How can i use the output of function after parfor loop?
You need to output the result into some sort of "sliced variable". Basically this means outputting an array where one of the sub...

25 days ago | 0

Answered
Parfor converting object to double?
In older versions that exhibit the problematic behaviour, your best bet is probably to use a cell, like so: N = 3; resultCell ...

28 days ago | 1

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Answered
Add rows to a table in a parfor loop
This problem should have been fixed in R2019b (please let me know if you're using a later version and things are not working). I...

30 days ago | 1

Answered
'Default' random seed when parallel pool is created?
Workers in a parallel pool have deterministic random number generation states set up each time they start up. This is described ...

1 month ago | 2

Answered
Pre-load data on multiple GPUs for parfor loop
You've got a number of options here depending on whether you can build the value of A directly on the workers. The simplest case...

2 months ago | 0

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Answered
Problem with parfor loop
That error basically means a worker crashed while trying to run the parfor loop. You mention that x is large. If you are using t...

2 months ago | 0

Answered
How to speed up simulink parallel simulation using parsim command inside a for loop
To see the benefit of parsim, you need to set up multiple SimulationInput instances ahead of time, and then make a single call t...

2 months ago | 0

Answered
Parfor Loop Error with Classification
I think you can adapt this to work with parfor, but it's going to be a little bit of a stretch. Your variable z_new can be consi...

2 months ago | 1

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Answered
Critical code section inside parfor
Further to Walter's response, the closest analogy in parfor is a reduction variable. These may appear to be updated by multiple ...

3 months ago | 0

Answered
Can I use parfor and CVX togther
I'm not familiar with the CVX toolbox. However, a lot of parfor problems can be remedied by pushing the body of the loop into a ...

3 months ago | 1

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Answered
How to set all one gpuArray in mex?
You basically have two options: either create and uninitialized mxGPUArray and fill the values using CUDA code (either a kernel,...

3 months ago | 0

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Answered
How to check the Bytes of gpuArray?
Unfortunately, whos does not currently report the number of bytes used by a gpuArray on the GPU - the 4 bytes you see reported i...

3 months ago | 0

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Answered
Alternative ways to slice/manage data using PARFOR
parfor can work with struct and cell, but it's often a bit tricky because you need to satisfy the requirement that the slicing i...

3 months ago | 0

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Answered
Restart random numbers with parallel loop
The error that you're seeing there I think is because you've got an old version of your "State.mat" file - the error is the one...

3 months ago | 0

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Answered
Behaviour ofparfeval depends on debugging state (Bug?)
I suspect this is because when you don't stop in the debugger, the function can return as soon as F gets into state 'running', i...

3 months ago | 0

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Answered
Possible to speed up this gpuArray calculation with arrayfun() (or otherwise)?
A few points here. Firstly, (and most importantly), to time code on the GPU, you need to use either gputimeit, or you need to in...

4 months ago | 1

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Answered
User defined functions with dynamic parameterisation in a parfor loops
This documentation for parfor notes various limitations - and also notes explicitly that you can create anonymous functions insi...

4 months ago | 1

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Answered
In parfor-loop, can I call a multi-threaded mex and get some speed-up?
You should be able to run a multi-threaded MEX file correctly inside a parfor loop. However, you will be oversubscribing your ma...

4 months ago | 0

| accepted

Answered
Parallel computing, occasionally get Exception message "Message Catalog MATLAB:load was not loaded from the file"
The probable cause of this is the file handle limit. This page: https://www.mathworks.com/help/parallel-computing/recommended-sy...

5 months ago | 0

| accepted

Answered
How can I run parallel job on a specific node?
Based on this stackexchange answer https://unix.stackexchange.com/questions/443438/how-to-submit-a-job-to-a-specific-node-using-...

5 months ago | 0

| accepted

Answered
Are temporary variables eliminated at the end of each parfor loop on every single worker?
Yes, as mentioned in the documentation https://www.mathworks.com/help/parallel-computing/temporary-variable.html temporary varia...

5 months ago | 0

| accepted

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