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Edric Ellis

MathWorks

Last seen: 10日 前 2011 年からアクティブ

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

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Interference in parfor when using global variables
Separate workers have their own completely separate global workspaces. If the function that you call from parfor first assigns a...

10日 前 | 0

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Parsing files and computing in parfor - GA
When working with a remote cluster parpool, usually Parallel Computing Toolbox is able to work out automatically which files nee...

約1ヶ月 前 | 0

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Parallelize cumulative average algorithm
You can use a parfor "reduction variable" to compute this, with a slight modification which may or may not be significant: dat ...

約1ヶ月 前 | 0

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doubts about parfeval memory allocation
If the entire dataset only just fits in memory once, then a better option than readall might be to use partition on the datastor...

約1ヶ月 前 | 0

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Error Implementing parfor while creating satellite objects
I'm guessing you are trying to use this with a thread-based parallel pool. I had to add a line to your code to make it work, nam...

約1ヶ月 前 | 0

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Why is it not possible to pass matrix parameters as argument to GPU arrayfun and what to do?
It would be great to see a simplified example of what you're trying to do. What you can do with gpuArray/arrayfun is write a nes...

約2ヶ月 前 | 1

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terminate program if worker aborts in parallel loop
If you create your parpool using the option SpmdEnabled=true, then this has the side-effect of making parallel pools terminate c...

約2ヶ月 前 | 0

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How is the work distributed in parfor loop?
If you know in advance which iterations are the time-consuming ones, then you could consider running those together as a separat...

約2ヶ月 前 | 1

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How can I debug a parallel script with spmd?
Unfortunately you cannot set breakpoints in code running on workers. If the problem is related to the messages you are sending u...

3ヶ月 前 | 0

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how parfor distributes resources to each iteration if the number of cores is larger than the number of iterations
When a parfor loop executes on a parallel pool, PCT will divide up the entire loop range 1:N into a series of batches known as "...

3ヶ月 前 | 3

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bug parfor: analyzing and transferring files to worker: not done: blocked
The "analyzing and transferring files to workers" message occurs only when the workers encounter a failure to find some code tha...

3ヶ月 前 | 0

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parpool use existing slurm job
Further to @Venkat Siddarth Reddy's suggestion, what you might want to do is something like this: clus = parcluster('mySlurmPro...

3ヶ月 前 | 0

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Store intermediate results of cost function when solver is run in parallel
You could use a parallel.pool.PollableDataQueue to let the workers send the data to the client. The idea is that you create the ...

3ヶ月 前 | 0

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"Invalid or deleted object" when using clib object in parfor loop
I'm not terribly familiar with clibgen I'm afraid, but I think the problem here is almost certainly that the function myCppFunct...

3ヶ月 前 | 2

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MATLAB workers can't access files in network shared folder
You could try using FileStore for this. You'll first need to save your figure to a temporary location on disk, and then you can ...

3ヶ月 前 | 0

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Running parfor on multiple nodes (20 nodes = 960 cores) using Slurm (super computer)
To run across multiple nodes of a cluster, you need to set up MATLAB Parallel Server on the cluster. You might well need help fr...

4ヶ月 前 | 1

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Parallelization data organization/transfer
parfor is designed to "just work" for a wide range of cases, but it's true that sometimes you need a bit more control. parforOpt...

4ヶ月 前 | 0

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Access Violation Detected MatLAB
That crash dump clearly implicates your MEX file octtrees.query_index_moct. One of the common pitfalls when running MEX files in...

5ヶ月 前 | 0

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Is it possible to run multiple lines at once in a Matlab script?
To expand just a little on @Stephen23's comment - you can do this if you have Parallel Computing Toolbox. You should first restr...

5ヶ月 前 | 1

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CNN Performance: CPU Consistency vs. GPU Variance - Why?
I'm not certain if it will make everything consistent, but note that random state on the GPU is controlled by the gpurng functio...

5ヶ月 前 | 0

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Parfor with options = statset('UseParallel',true);
If you are able to "flatten" the parallelism so that it is all exposed to a single parfor loop with enough iterations to keep al...

5ヶ月 前 | 0

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Is it possible to use parfeval and backgroundPool to write to a Mongo database in a background thread?
In your first case using parfor, if you haven't changed any settings, you will be using a process pool. (The default profile is ...

5ヶ月 前 | 0

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Avoid memory copy in thread-based environment (parfeval)
In this case, thread-based workers already avoid copying the large array m to the workers. See this section in the doc. Note tha...

5ヶ月 前 | 2

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How to assign values to arrays inside the PARFOR loop in Parallel Computing Toolbox?
To assign into A here, you need to follow the rules of sliced variables in parfor. In this case, you need to modify your code to...

7ヶ月 前 | 1

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Is there a parallel version of splitapply()?
tall arrays support parallel execution of splitapply. Would that work for your case?

7ヶ月 前 | 0

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How do you organize data from a parfor loop?
You can do this more directly by flattening the parfor loop, and using a combination of ind2sub and reshape. The idea is as foll...

11ヶ月 前 | 0

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How to use parallel.pool.Constant to save on overheard for large array constant across all calls to parfeval?
You've got a subtle flaw in your first piece of code that allows the program to run, but it does not actually benefit from the u...

11ヶ月 前 | 0

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Read/Write Limitations with Parallel Computing Toolbox (parfor)
Generally speaking, parfor is conservative in what it allows to ensure that by default, all variable accesses are safe. It is s...

11ヶ月 前 | 0

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Parallel workers automatically shutting down in the middle of RL parallel training.
If workers are leaving the pool one at a time while the pool is busy, this almost certainly means that they are crashing. I reco...

11ヶ月 前 | 0

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Clear persistent variables of function on worker
Whenever you issue a clear command at the client, the same clear command is issued on the workers. So you can simply do clear p...

11ヶ月 前 | 1

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