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Edric Ellis


Last seen: ein Tag ago

MathWorks

742 total contributions since 2011

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

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Answered
How to properly store variables to use with parfor?
Yes, your code is somewhat inefficient in that in each parfor loop you're sending the whole of Tree to the workers. Here are a c...

ein Tag ago | 0

Answered
Parfor, how do I use the variable within the loop correctly?
The problem here seems to be that you're making multiple assignments to e.g. fvalagg. A stripped-down version of your code is so...

10 Tage ago | 0

Answered
Solution of large sparse matrix systems using GPU MLDIVIDE
A couple of suggestions: On the CPU, if you're repeatedly solving the same system, you might be able to benefit from the recent...

10 Tage ago | 0

Answered
How are iterations assigned to workers in parfor?
As @Mohammad already commented, the parfor implementation automatically divides up the iterations of the loop onto the workers. ...

18 Tage ago | 0

| accepted

Answered
How do I get parfor to downgrade gracefully to for when no parallel seat is open?
parfor already has the innate ability to run without Parallel Computing Toolbox being present, and it should automatically handl...

19 Tage ago | 0

Answered
Parfor loop using 'saves' correctly on around half of iterations
In general, it is not safe to have multiple workers attempting to save to a single file. The results are likely to be unpredicta...

etwa ein Monat ago | 1

Answered
Why does function become slower when placed in spmd block?
Your desktop MATLAB client can use "built-in multithreading" for certain operations. By default, workers in a parallel pool use ...

etwa 2 Monate ago | 0

| accepted

Answered
tall/gather issue
This error means that the workers on your remote cluster cannot find code that they need to execute your tall array algorithm. Y...

etwa 2 Monate ago | 0

Answered
Cluster Profile Manager SPMD job test Failed
I'm going to guess you're using Linux. This is probably related to your ulimit settings, probably the limit on number of process...

etwa 2 Monate ago | 0

Answered
GPU computing: data no longer available on device??
That error occurs when MATLAB resets the GPU "context". This generally happens when you either select a different GPU device, or...

etwa 2 Monate ago | 2

Answered
fit options in a parfor loop
Unfortunately, this is a limitation in the implementation of the fitoptions class. You can work around this either by constructi...

2 Monate ago | 2

Answered
parfeval() doesn't call function
Unfortunately, the MATLAB debugger can't stop in code running on the workers - only code running at the client. In this case, y...

3 Monate ago | 0

| accepted

Answered
Parallel and serial computation
MATLAB uses built-in parallelism on a single machine for many large matrix operations. See this page: https://uk.mathworks.com/d...

3 Monate ago | 0

Answered
Error in saving and load function for MAT file using parfeval
The error you're receiving is a bit surprising - that probably means that all your workers crashed somehow. In any case, the sy...

3 Monate ago | 1

| accepted

Answered
Multiple outputs with parfeval
Each call to parfeval always returns only a single Future object. You can then subsequently request multiple outputs when you ca...

3 Monate ago | 0

Answered
parfor and function call using scatteredInterpolant
I'm not that familiar with scatteredInterpolant, but I concocted the following which shows I think the sort of thing you're afte...

3 Monate ago | 0

| accepted

Answered
Correct fetchNext index after clearing FevalFuture object
One way you can deal with this is by making the same modification to m as you proceed. Something like this perhaps: N = 10; m ...

3 Monate ago | 0

Answered
Slow performance of fftn in the gpu when used inside a loop
Various methods on the GPU operate to some extent asynchronously. But there are limits to this - depending on the amount of memo...

4 Monate ago | 0

Answered
Problem with parallel pool
Don't use -nojvm, Java is required for Parallel Computing Toolbox functionality. It looks like you're trying to start 4 workers...

4 Monate ago | 0

Answered
How can I solve the problem of communications of workers?
In your code, you define "sizeofChrom_dis_local", but then try to loop over "sizeofChrome_dis_local" - note the extra "e". That'...

4 Monate ago | 0

Answered
Communicate with worker through client
I think it would be better to use parfeval or parfevalOnAll to do this. This way, you can simply cancel the future object return...

4 Monate ago | 1

Answered
pctRunOnAll does not recognize current parallel pool
You should use pctRunOnAll at the client, i.e. before the start of the loop, like this: gcp(); % Ensure we have a parallel pool...

4 Monate ago | 0

| accepted

Answered
Problem with parfor and matrix indexing
In each case, you're attempting to assign neighbours elements into each of your output arrays. The restrictions on parfor sliced...

4 Monate ago | 0

Answered
Four Parallel Nested For Loop
It's generally best to parallelise the outermost loop. However, you need to balance that against ensuring the parfor loop has su...

4 Monate ago | 0

| accepted

Answered
storing value in 2D array in a parfor loop
As mentioned in the documentation, a sliced variable must have a single subscript being the loop variable (in this case i), and ...

4 Monate ago | 1

| accepted

Answered
Calling function described in actxcontrol inside parfor loop
Firstly, you are declaring h1 to be a global variable in your APT_GUI_SYS script. That will not work as you expect - workers are...

5 Monate ago | 0

Answered
How to I pass off a Simulink application command syntax to MATLAB Job Scheduler on a local cluster?
Where do the results from running app inputfile.m go? Does this create variables directly in the base workspace? To use app tog...

5 Monate ago | 1

Answered
parfor usage in parallel computing tool
This is a documented restriction for sliced variables within parfor. The relevant doc page is here, and the relevant section is:...

5 Monate ago | 0

| accepted

Answered
Reported Task State not accurate when running on MS HPC grid
Unfortunately, getting accurate state information back from the cluster can be tricky. This is because there are multiple source...

5 Monate ago | 2

| accepted

Answered
big data 2d matrix percentile calculation using tall
That particular error is an internal error basically because your tall array expression is simply too large - contains too many ...

6 Monate ago | 1

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