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Edric Ellis


MathWorks

676 total contributions since 2011

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

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Answered
Batch saves the window screenshot in Task1.in.mat file
You haven't really given us enough reproduction steps to see exactly what's going on here, but I'm going to take a wild stab in ...

3 days ago | 0

Answered
Loop through structure elements with parfor
Given the following example data myStruct = struct('one', rand(1), ... 'two', rand(2), ... 'three', rand(3)); My sli...

4 days ago | 0

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Answered
write an imgae of type gpuarray
Try imwrite(gather(res), 'myfile.jpg')

4 days ago | 0

| accepted

Answered
Long transmission times of parfeval with large parallel.pool.Constant objects
You are correct that parallel.pool.Constant data is already available on the workers after construction. It's not clear to me wh...

10 days ago | 1

Answered
PARFOR slicing of user-defined objects
The parfor machinery decides whether a variable reference is "sliced" or not by examining the form of indexing used, paying no r...

19 days ago | 1

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Answered
parfor Vs muliple matlab session
parfor ought to be considerably more convenient than manually opening multiple MATLAB windows and ensuring they're all working o...

22 days ago | 0

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Answered
Issue with Simulink Model Simulation using CVSIM command inside Parfor ?
Caveat: I know nothing about cvtest or cvsim. I suspect that cvsim is trying to inspect the calling workspace - this is not allo...

23 days ago | 0

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Answered
Parallel Computing - COM Port Error
My guess is that your code inside the spmd block performs some initialization that either should be done only once per MATLAB pr...

29 days ago | 0

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Answered
Using parallel workers to edit same Simulink model?
In short: no - you cannot make simultaneous changes to a single Simulink model file from multiple processes (i.e. the multiple M...

2 months ago | 1

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Answered
parfor energyplus co-simulation toolbox
I think the problem here is that the toolbox is not designed to be run multiple times simultaneously on a single machine. I took...

2 months ago | 0

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Answered
How can one create an object in MATLAB that behaves like an array?
To make an object in MATLAB that is a single object that behaves like an array, you need to overload a bunch of methods to do wi...

2 months ago | 1

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Answered
How to call a user-defined function within a parfor loop
You should call addAttachedFiles outside the parfor loop.

2 months ago | 0

Answered
Is there a technical limitation/design choice preventing dynamic allocation of parfor workload?
The parfor implementation already attempts to take account of this sort of situation - behind the scenes, the loop is split up i...

2 months ago | 1

Answered
Speed up big matrix multiplication (Parallel Processing/GPU)
You should take advantage of: Implicit dimension expansion, and The new multi-dimension arguments to sum and then perform the...

2 months ago | 1

Answered
how do I slice a variable? parfor loop
The problem here is that the parfor machinery cannot tell that you are completely overwriting quantity and Quantity_av in your i...

2 months ago | 2

Answered
The variable x in a parfor cannot be classified
Hm, I didn't see that precise error. I modified your example just a little so that it was actually executable, like so: n = 4; ...

2 months ago | 0

Answered
Variable to track parfor loop progress
@Matt J posted the simplest option which is to have the parfor loop display data. If you need more sophistication, you can use D...

3 months ago | 1

Answered
How to run multiple cores without graphical interfaces?
I'm guessing you're starting MATLAB by running matlab -nojvm. This will not allow parpool to work. Use matlab -nodisplay instead...

3 months ago | 1

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Answered
Is there a way to change number of worker in a created parpool?
Unfortunately, there is currently no way to increase the number of workers in a parallel pool. One approach that might possibly ...

3 months ago | 1

Answered
How can I store dates as arrays for further process when using Matlab GPU computing?
If you know the reduction operation you wish to perform on z, then you might be able to update a "running total" as the while lo...

3 months ago | 0

Answered
Strange sparse matrix error on GPU
The maximum number of elements in a gpuArray is intmax('int32'). In this case, the scalar addition is forcing your sparse matrix...

3 months ago | 0

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Answered
Issue with Simulink Model Simulation inside Parfor ?
As @Sean says, parsim is the way to go if you can. However, as a workaround, you might get away with doing something like this: ...

3 months ago | 1

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Answered
How can I launch a script as an LSF job from the Matlab console?
Yes, you can use the batch command to do this. You'll need Parallel Computing Toolbox installed on your desktop MATLAB client, a...

3 months ago | 1

| accepted

Answered
isempty slow on GPU
I think there are a couple of things going on here. Firstly, enabling the profiler introduces overheads - particularly to GPU-r...

3 months ago | 0

Answered
Checking if persistent variable exists on GPU: check if 'data no longer exists on the GPU' for a variable.
You need existsOnGPU, like so: x = gpuArray(1); assert(existsOnGPU(x)); reset(gpuDevice); assert(~existsOnGPU(x));

4 months ago | 0

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Answered
Accessing gpuDevice WITHOUT resetting it, and without carrying around a gpuDevice handle, or declaring a global
You can simply use gpuDevice() with no input arguments to access the currently selected GPU device without resetting it.

4 months ago | 1

| accepted

Answered
After uninstalling CUDA toolkit still MATLAB responds for gpuDevice() !!
MATLAB and Parallel Computing Toolbox need the CUDA driver to be installed on your system, not the CUDA toolkit. I admit it is...

4 months ago | 1

Answered
How to reset job numbering in MATLAB Distributed Computing Server?
Unfortunately, there is indeed no way to do that (using the MATLAB Job Scheduler) without shutting down the jobmanager, and star...

4 months ago | 0

Answered
How to measure parfeval() execution time?
A parallel.Future instance has StartDateTime and FinishDateTime properties - you can subtract these to get an idea of the execut...

4 months ago | 0

Answered
Advantages of parpool vs. job/tasks vs. multiple batches?
If you want to be able to quit the client machine while the process is running, then either |batch| or |createJob| & |createTask...

5 months ago | 0

| accepted

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