Raymond Norris

MathWorks

Last seen: 2 days ago | Active since 2003

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What is going on when I call a function that uses parfor loop inside of a parfor loop in my main script?
The outer parfor-loop is parallelized and the inner parfor-loop is run as a for-loop.

1 day ago | 0

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Can I use GPU instead of CPU to run parfor-loop?
GPU threads aren't divided up by workers. Conversely, one worker controls a GPU at a time.

9 days ago | 0

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How to input global variables in function that is in parloop?
We can agree that if global variables were supported, you wouldn't modify data1 and have that reflected on the client -- that wo...

25 days ago | 0

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Pausing to Save data and Then Rerun from the Same State
There isn't. parfor blocks MATLAB from anything else. To "stop" the parfor, you'd need to hit Ctrl-C, but then you'd stop the ...

26 days ago | 0

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Answered
MATLAB Cloud. How to use if I have an Institution license
MATLAB has several cloud offerings MATLAB Online (matlab.mathworks.com) Cloud Center (cloudcenter.mathworks.com), running on A...

28 days ago | 1

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Parrellel server dir() for files local to the server
For starters, you don't want to hard code files/paths in your code. Your code should be functions so that you can pass in root ...

1 month ago | 1

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Do changes in .m file after batch submission, while the job is queued, take effect for the current run?
The latter. MATLAB attaches all the files it needs with the job. You'll want to delete the job, eg. c = parcluster; j = c.ba...

1 month ago | 1

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Answered
Parallel Computing Toolbox, Pausing, and Hibernation
What you're asking for would require "checkpointing", where an application has the ability to stop midstream and resume later. ...

1 month ago | 0

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Parfor unnecessary communication overhead
This is a warning, not an error, displayed by the Code Analyzer. Not sure how MATLAB would "throw" this warning. Depending on ...

1 month ago | 0

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accumulate values in aftereach function
Persistent variables should work. Try the following q = parallel.pool.DataQueue; q.afterEach(@afterFunc); f = parfeval(@genD...

1 month ago | 0

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Estimated Time Left for Executing a Code Using MATLAB Parallel Computing Toolbox
MATLAB doesn't know how long your code should run for, so there's no way to know how much time is left. What I would suggest is...

1 month ago | 0

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Answered
How to run this code in a for loop?
You don't provide the line number of the error. What is day? Is that they time function? Couldn't day(k+26) be written as j...

1 month ago | 0

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Answered
how to increase the number of workers to 32 for parfor loop
Are you explicitly calling parpool? parpool(32); Alternatively, you can change the default by going to the Parallel preference...

2 months ago | 0

Answered
severe speed degradation with batch function on cluster
Let me see if I have this right Method #1 finishes runMe in ~5 minutes, using local scheduler PBS jobscript #!/bin/sh #PBS -...

2 months ago | 0

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Parallelization of SVD on research clusters
Building off of Kamil's suggestion to look at Edric's post, Edric suggests you ought to build the distributed array directly on ...

2 months ago | 0

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Startting parallel pool from App Designer
Hi @Giuseppe Gallo, I'm assuming the corresponding message in the command window is that the parallel pool is starting up with X...

2 months ago | 0

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Unrecognized function or variable in parfor
I don't see how you're getting the error. Can you provide a bit more context? For example, when I run something similar (I thi...

2 months ago | 0

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Creating a custom Docker-based container of Matlab and additional toolboxes
Hi @Maksims Abalenkovs, can you contact Technical Support (support@mathworks.com)? They ought to be able to troubleshoot this f...

3 months ago | 1

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Editing plugin scripts for Generic scheduler
Can you post the MATLAB code you wrote to add the sbatch options? Setting EnvironmentVariables won't resolve this issue (sbatch...

3 months ago | 0

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Do worker nodes in a parallel pool need direct connectivity to the client?
Our scheduler, MJS, supports interactive pools running from your desktop machine because the traffic is routed via the scheduler...

3 months ago | 1

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Answered
I increased numworkers to 3 but still receiving an error message that they are set to a maximum of 2 and I cannot figure out how to change this.
How did you set the number of workers? Did you set it in the Cluster Manager Profile? Or did you set it to something similar t...

3 months ago | 0

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Possibility of changing nested for into parfor
If I have this right, you're only working with PCNN_Y where its value is 1. Then you skip over the first sp instances where it'...

3 months ago | 1

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Validation Error on the parallel cluster
The plugin scripts support "remote" and "on-cluster" submission. When you went through the wizard to create the profile, you se...

3 months ago | 0

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Request exclusive use of slurm batch nodes for a parpool that is less than the total number of cores.
Renat your MATLAB code looks similar to installations we've supported in the past. If that's true, run c.AdditionalProperties ...

3 months ago | 0

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Avoid broadcasting an array in parfor
As a side note, I suspect that parfor i=size(combinations,1) should be more like parfor i=1:size(combinations,1) as the orig...

3 months ago | 0

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Answered
Error using oddiyxy1 (line 23) Error: The variable a in a parfor cannot be classified. See Parallel for Loops in MATLAB, "Overview".
I'm not sure how long it took you, but your code as it's written only took 1-2s, which wouldn't make a good problem to paralleli...

3 months ago | 1

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Answered
How to enable two threads to tackle with different tasks? E.G. control hardware acquisition and data processing synchronously
parfeval can run different tasks. For example: pool = parpool(2); daq = pool.parfeval(@acquireData, ..); proc = pool.parfev...

3 months ago | 0

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Answered
Can i run matlab code on different PC's together?
Parallel Computing Toolbox should be installed on your desktop machine and MATLAB Parallel Server should be installed on your la...

3 months ago | 0

Answered
AWS EC2 link to MATLAB online
If I have my codes correct, you're running MATLAB with a commerical license and MATLAB Parallel Server with an academic license....

4 months ago | 0

Answered
PARFOR loop can not run due to the way variable "M" is used.
Collapse M(i,1) = data1(f1(i),1); M(i,2) = data1(f1(i),2); M(i,3) = Alt(i); M(i,4) = datenum(f1(i)); to M(i,:) = [data1(f1...

4 months ago | 0

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Raymond Norris

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