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Edric Ellis

MathWorks

Last seen: 5 dagar ago Active since 2011

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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 ...

6 dagar 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.

11 dagar ago | 1

| accepted

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...

ungefär en månad 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...

ungefär en månad ago | 0

| accepted

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...

ungefär en månad ago | 1

| accepted

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...

ungefär en månad 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...

ungefär en månad ago | 0

| accepted

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 ...

ungefär 2 månader 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...

ungefär 2 månader 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...

ungefär 2 månader ago | 0

| accepted

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...

ungefär 2 månader 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...

2 månader 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...

3 månader 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...

3 månader ago | 0

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

3 månader 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 ...

3 månader 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...

3 månader 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...

3 månader 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...

3 månader 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 ...

3 månader ago | 0

| accepted

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...

3 månader 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...

3 månader ago | 1

| accepted

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...

3 månader 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 ...

4 månader ago | 1

| accepted

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...

4 månader 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 ...

4 månader 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...

5 månader ago | 0

| accepted

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...

5 månader 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...

5 månader 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...

5 månader ago | 1

| accepted

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