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Edric Ellis


Last seen: Today

MathWorks

766 total contributions since 2011

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

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Answered
Parallel optimization hanging on getCompleteIntervals
A few notes: The deadlock detection is for labSend and labReceive. Your parallel code is using parfor. There is no way that par...

2 dagar ago | 1

Answered
mpiprofile viewer crashes unexpectedly
I suspect the debug breakpoint is interfering with the data transfer from the spmd block back to the client. I suppose the only...

3 dagar ago | 0

| accepted

Answered
Issue with writematrix and parfor
You cannot write to the same file simultaneously from mulitple processes. (This is not a limitation specific to parfor - rather,...

3 dagar ago | 0

Answered
interrupt a function when it takes too long
The simplest approach would be to modify the potentially long-running function so that it checks whether it has exceeded its tim...

3 dagar ago | 0

Answered
Can ParallelServer be run from a client behind a NAT (connecting to cluster outside of NAT)
It should work to specify the routable address at the client using pctconfig. Something like pctconfig('hostname', '<routable a...

8 dagar ago | 0

| accepted

Answered
Convert code to run on parallel
It's hard to tell exactly what computations you're performing there. It would be better if you could give us a reproducible exam...

9 dagar ago | 1

| accepted

Answered
How to close client node when running a parpool job across multiple nodes of a cluster using slurm scheduler integration
You would be better off if you can submitting only a single job to the cluster, have that job be a batch job with the Pool optio...

10 dagar ago | 0

| accepted

Answered
-r vs -batch when calling matlab in unix
(I'm not an expert here, just a user of the -batch option) The main advantages for me of the -batch option compared to -r for n...

10 dagar ago | 0

| accepted

Answered
Parfor indexing for looping over edges and assigning to adjacent cell indices
I think this can be made to work, but it might be a little tricky. parfor is complaining because your output variables flux and ...

13 dagar ago | 0

| accepted

Answered
Parfor solving optimization problems (Cplex) slower than for
Does the performance improve much / not much / not at all if you run the parfor loop a second time without closing the pool? If...

16 dagar ago | 1

Answered
Parfor gives NaN when for does not
I'm not sure if this is the only problem, but the fact that you have a global variable set on the client and used by the workers...

22 dagar ago | 0

| accepted

Answered
Error while using dct on gpu. Matrix dimensions must agree.
This appears to be a problem with the gpuArray version of dct. Thanks for reporting this.

24 dagar ago | 0

Answered
SPMD - store all values and return
I tried the following, which worked as expected: spmd(2) if labindex == 1 labSend(magic(4), 2); else ...

24 dagar ago | 1

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Answered
Parfor failure: cannot load object of class 'cSapModeL'. Its class cannot be found.
You need the code for the class cSapModel to be available on the workers. The following might help: addAttachedFiles(gcp(), 'cS...

ungefär en månad ago | 0

Answered
Seeding random number generator in parfor properly
I'm not an expert by any means, but my understanding is that your proposed approach will give you reproducible results, but the ...

ungefär en månad ago | 1

| accepted

Answered
inexplicable GPU memory usage
MATLAB caches GPU memory and FFT plans etc. to make subsequent operations more efficient. This does mean that the FreeMemory pro...

ungefär 2 månader ago | 0

| accepted

Answered
Code that processes a Byte structure in parfeval crashes the parallell workers
I would suggest that you need to run whatever code you're currently using to initialize img on the desktop client, you instead r...

ungefär 2 månader ago | 0

Answered
How to restart a worker in parpool?
You can't easily do this with parfor, but you can do something like this with parfeval. I haven't tried too hard here to make th...

ungefär 2 månader ago | 1

| accepted

Answered
Running functions in parallel
In your code above, the two parfeval lines are initiating asynchronous function evaluation requests in parallel. You're also cal...

ungefär 2 månader ago | 0

Answered
Slicing variable in parfor loop (restricted indexing)
Steve has already pointed out that your X indexing expressions make it ineligible for slicing as things stand. However, fortunat...

ungefär 2 månader ago | 0

| accepted

Answered
CUDA kernel MaxThreadsPerBlock not constant
In your comment you mention that you see different values of MaxThreadsPerBlock for different kernels. This is expected. The CUD...

ungefär 2 månader ago | 1

Answered
sparse and gpuArray/sparse errors very odd! (with MWE)
@Matt J has already provided some great information here, just adding a few more thoughts on your specific cases. Case 1: spar...

2 månader ago | 1

| accepted

Answered
Calling parpool with SpmdEnabled = False
Unfortunately, only MJS and Local cluster types support SpmdEnabled = false. You might be able to use the "cluster parfor" appro...

2 månader ago | 0

| accepted

Answered
How do I specify the number of workers in parfeval without deleting and recreating my pool
Unfortunately, there's no API to constrain the number of workers from the pool eligible to be used by parfeval. What you could c...

2 månader ago | 1

| accepted

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...

2 månader ago | 1

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...

3 månader 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...

3 månader 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. ...

3 månader 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...

3 månader 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...

4 månader ago | 1

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