Edric Ellis

MathWorks

Last seen: 1 day ago | Active since 2011

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

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Answered
Cluster multi-gpu training Error: Current pool is not local.
I think you need to specify ExecutionEnvironment="parallel" for this situation. According to the trainingOptions reference page,...

22 days ago | 0

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Answered
Is is possible to run a batch job on an MJS Cloud Center cluster with SpmdEnabled set to false?
Unfortunately, this option is not supported at the moment for batch jobs. I realise it's probably rather a big change to your co...

1 month ago | 0

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Answered
I need help regarding parfeval implementation with object handle. I have created an object handle, the member functions of which i want to run as parallel processes.
The documentation here applies to parfeval as well as parfor in the sense that the object instances on the workers are not conne...

1 month ago | 0

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Answered
How to avoid broadcast variable while optimizing a cost function in parallel computing?
Investigating performance of parfor loops can be a bit tricky. Here are a few pointers: Do you happen to know if your function ...

2 months ago | 0

Answered
parfor with temporary variable worning
I think there are a couple of problems here. Firstly, I think you need to change the way you're assigning into dcm_stack because...

2 months ago | 0

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Answered
Can parfor be used if no Parallel Computing Toolbox licenses are available?
The implementation of parfor is intended to gracefully fall back to running in serial if a Parallel Computing Toolbox licence ca...

3 months ago | 0

Answered
Slicing variable in parfor loop
In this case, you don't actually have a data dependency between the loop iterations. You can use a parfor reduction to do this, ...

3 months ago | 0

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Answered
GPU0 and GPU1 in matlab?
GPU Computing in MATLAB supports only NVIDIA devices, so your Intel graphics card cannot be used by gpuArray.

3 months ago | 1

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Answered
Sliced Variables in N Choose K Search
This is a limitation of the parfor analysis when it comes to indexing sliced variables in a nested for loop. There is another wo...

3 months ago | 0

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Answered
Use Parfoor Loop for Parameter Sweep Optimization
You can do this using a custom reduction function in parfor. Like this: p = 1:10; someFcn = @sin; % Use a 2-element vector to...

3 months ago | 2

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Answered
SMPD block getting stuck and not executing
I suspect the problem here is that the way that you're using spmdSend and spmdReceive doesn't quite match how they work. When yo...

3 months ago | 0

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Answered
How can I Ensure Transparency in parfor-Loops when using cell2table ?
Most of the table-building functions can have this problem if you do not specify 'VariableNames', like this (tested in R2019a): ...

3 months ago | 2

Answered
Parrallel run using parfor and institute server?
The problem with converting the outer loop to parfor is described in the error message that you get when you try: Error: When i...

4 months ago | 0

Answered
Incompatible indexing of variable for parfor
The total size in bytes of Network is 5*12*76*8 = 36480. That is tiny. Ignore the parfor "broadcast" warning - that is intended ...

4 months ago | 0

Answered
Minimum/maximum CUDA Toolkit requirement for R2022a
To run code using gpuArray, you do not need to install a CUDA Toolkit. You only need a CUDA driver. You should always* install t...

5 months ago | 0

Answered
Is there an easy way to find out which workers are running on the same host in a Generic Cluster job so I can efficiently allgather?
You can use gop to perform general MPI-style all-reduce operations, and a special case of that is gcat which can operate as an M...

5 months ago | 0

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Answered
Unsure why parfor loop does not work in this case
The problematic variables appear to be both M and P. For M, you have multiple different "reads" from the variable after the init...

6 months ago | 0

Answered
Writing to .mat simultaneously with parfor loop
Don't attempt to save from multiple workers to the same file, this will sometimes fail (exactly when/how it fails depends on you...

6 months ago | 2

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Answered
SPMD to process different iteration on different worker
It's not entirely clear to me quite what you're after. You might want for (drange) which spreads the iterations of a for loop ov...

6 months ago | 0

Answered
process based parpool: keep the data in the workers
Mike has already suggested looking at parfeval. The other option, which may be appropriate for your problem is to use spmd. This...

7 months ago | 0

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Answered
GUI program with parfeval
You should be able to cause the GUI to update by using wait in a loop, together with drawnow. A bit like this: while ~wait(thre...

7 months ago | 0

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Answered
Parfor loops indexing into table rows
There's a few things conspiring against you here. Firstly, parfor analysis doesn't understand how to "slice" table data using va...

7 months ago | 1

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Answered
Discarded Messages with SPMD and labReceive ... why?
Using conditional receives in this way is not a robust way to get the workers to collaborate - you have an ordering problem that...

7 months ago | 0

Answered
How to set a background pool to process-based instead of thread-based
Unfortunately, as you have seen fopen is not yet supported on thread-based pools such as backgroundPool. There is no way to conf...

7 months ago | 0

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Answered
parfeval with fetch not working
You cannot pass database connection objects to workers directly like this. You should use createConnectionForPool . There are ex...

7 months ago | 2

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Answered
How to select GPU when doing thread-based parallel?
Unfortunately, spmd is indeed not yet supported for thread-based pools. Until it is, you can do something like the following to ...

7 months ago | 1

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Answered
Segmentation error during parfor loop (remote linux server)
The crash dump suggests the workers are crashing inside ipqpdense. This problem should be fixed if you upgrade to R2020a or late...

7 months ago | 0

Answered
Why does the number of workers decrease while running parfor?
The number of workers in a local parallel pool decreases like this only when one of the worker processes terminates (i.e. crashe...

8 months ago | 0

Answered
valid indices in a parfor loop
There are a couple of ways to work around this. You can either unroll the inner loop, or else make the output matrix 3d so that ...

8 months ago | 0

Answered
Using public class methods and libraries in parfeval()
I suspect the problem here is that when you transfer instances of your ADXL372 class to the workers, they are not getting set up...

8 months ago | 0

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