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Edric Ellis

MathWorks

Last seen: 8 Tage vor Aktiv seit 2011

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

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Beantwortet
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...

8 Tage vor | 0

Beantwortet
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...

etwa ein Monat vor | 0

Beantwortet
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 ...

etwa ein Monat vor | 0

| akzeptiert

Beantwortet
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...

etwa ein Monat vor | 0

| akzeptiert

Beantwortet
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...

etwa ein Monat vor | 0

| akzeptiert

Beantwortet
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...

etwa 2 Monate vor | 1

| akzeptiert

Beantwortet
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...

etwa 2 Monate vor | 0

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Beantwortet
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...

etwa 2 Monate vor | 1

| akzeptiert

Beantwortet
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 Monate vor | 0

Beantwortet
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 Monate vor | 3

Beantwortet
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 Monate vor | 0

Beantwortet
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 Monate vor | 0

Beantwortet
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 Monate vor | 0

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Beantwortet
"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 Monate vor | 2

| akzeptiert

Beantwortet
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 Monate vor | 0

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Beantwortet
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 Monate vor | 1

Beantwortet
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 Monate vor | 0

Beantwortet
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...

4 Monate vor | 0

Beantwortet
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...

4 Monate vor | 1

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Beantwortet
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 Monate vor | 0

Beantwortet
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 Monate vor | 0

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Beantwortet
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 Monate vor | 0

Beantwortet
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 Monate vor | 2

| akzeptiert

Beantwortet
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 Monate vor | 1

| akzeptiert

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

7 Monate vor | 0

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Beantwortet
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 Monate vor | 0

Beantwortet
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 Monate vor | 0

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Beantwortet
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 Monate vor | 0

| akzeptiert

Beantwortet
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 Monate vor | 0

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Beantwortet
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 Monate vor | 1

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