Thomas Ibbotson
MathWorks
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10 of your answers have been accepted
Awarded to Thomas Ibbotson on 15 Feb 2022
Contribute at least one answer each month for 6 consecutive months
Awarded to Thomas Ibbotson on 20 Jul 2017
3 of your answers have been accepted
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Provide your first answer ever to someone else's question
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Solve a problem for the first time
Awarded to Thomas Ibbotson on 31 Jan 2012
Feeds
How can I know which worker performs each iteration of the parfor loop?
You can find out which worker is running your code using the following function: https://uk.mathworks.com/help/parallel-computin...
3 mois il y a | 1
Accelerating code wont work
The matrix operations you are using (mldivide and matrix multiplication) are already implicitly multi-threaded and will use all ...
9 mois il y a | 0
Matlab cloud center and AWS
That's a message from AWS saying they're waiting on approval for the new resource types. Follow the link in the message to conta...
9 mois il y a | 0
How to disable MDCS cluster discovery
The MATLAB Job Scheduler uses multicast to make the cluster discoverable. You could block multicast traffic on your head node fi...
plus de 5 ans il y a | 2
Heterogeneous nodes architectures in Matlab Parallel Computing Toolbox
No, mixing 64-bit and 32-bit workers in the same MJS cluster will not work. All workers must have the same bitness as the MATLAB...
presque 8 ans il y a | 0
Submit job to specified workers in an MJS cluster
Unfortunately, this is not possible. You could temporarily reduce the number of workers on each node to 5. The MJS startworker a...
plus de 8 ans il y a | 0
| A accepté
Parpool Java exception occurred: 2014a & Mac - Only when wifi at home turned on?
A patch has been released for this bug see: <http://www.mathworks.com/support/bugreports/1119179 Bug report 1119179>
plus de 9 ans il y a | 2
Getting output from parallel jobs that would regularly go to a diary
Remove the line with: wait(j, 'finished') Then this allows you to get the tasks' diary output while the job is still r...
presque 10 ans il y a | 0
Batch Processing of a Function with Different Arguments
I think code that looks something like this will work: for jobIdx = 1:length(nVector) jobs(jobIdx) = batch('long...
presque 10 ans il y a | 2
| A accepté
How can I use 30-50 workers instead of only the 12 maximum allowed in Parallel Computing Toolbox?
As of R2014a the number of local workers is no longer restricted. <http://www.mathworks.com/help/distcomp/release-notes.html See...
presque 10 ans il y a | 2
Maximizing the number of workers used in a parfor loop using the "batch" command
I think it might help to explain how batch with the 'matlabpool' argument works. This causes 1 worker to run 'myTest' as the cli...
presque 10 ans il y a | 1
| A accepté
Help with parcluster, createJob, and createTask
It looks like the number of processes you can run in your user account is limited. You can find out what it is set to by running...
presque 10 ans il y a | 1
| A accepté
Parallel computing on a cluster
We would need to see the code for 'submat', but my guess is that an independent job is being created rather than a communicating...
environ 10 ans il y a | 0
A few questions on running MATLAB on Amazon EC2 cloud
If you want to use the Parallel Computing Toolbox with Amazon EC2, have a look at <http://www.mathworks.com/ec2>. There is on-de...
environ 10 ans il y a | 1
Setting password when connecting to mjs
If you need to you can reset the user's password as the 'admin' user by using 'changePassword' with the username to change as th...
environ 10 ans il y a | 0
Matlab 2014a not using all logical cores
See Edric's answer to another question about hyperthreading here: <http://www.mathworks.com/matlabcentral/answers/80129#answer_...
environ 10 ans il y a | 1
Accessing Matlab Cluster from outside the network
I'm assuming you're using MJS. This is what the documentation has to say: BASE_PORT. The mdce_def file specifies and describ...
plus de 10 ans il y a | 2
JVM out of memory when running parfor on cluster
It's possible that the worker JVMs are not picking up the java.opts file. Workers have a different startup folder to the client ...
plus de 10 ans il y a | 2
| A accepté
How can I set the password while using the MDCS job scheduling feature on Linux.
The user can change their password using the changePassword method of the MJS cluster object: mjs = parcluster; changePa...
plus de 10 ans il y a | 0
Cannot connect to MJS with parcluster
I can't see anything obviously wrong there. I suggest you contact technical support, we have support engineers that can help you...
environ 11 ans il y a | 0
| A accepté
Using MATLAB in a client/server configuration
You need the MATLAB Distributed Computing Server ( <http://www.mathworks.co.uk/products/distriben/> ) to use the Parallel Comput...
environ 11 ans il y a | 1
How can I send a batch job with empty workspace ?
Hi Rafael, Unfortunately the error message you are receiving is misleading. The problem is that you are using the incorrect s...
environ 11 ans il y a | 2
Two different interacting programs on parallel computing toolbox
Hi Gav, I think you want the labsend, labreceive functionality. You can use the labindex function to switch between server be...
plus de 11 ans il y a | 0
| A accepté
not able to start Matlabpool
This is a known issue with the newer versions of the Java Virtual Machine. There is a patch available at: <http://www.mathwor...
plus de 11 ans il y a | 0
matlabpool line 134 error.
It's possible that you have ended up with a corrupt profile somehow. We can try cleaning it up and see if that helps. In MATL...
plus de 11 ans il y a | 1
| A accepté
Parallel programming: defining tasks
Hi Daniel, See my answer to your other related question: http://www.mathworks.com/matlabcentral/answers/62944-parallel-progr...
plus de 11 ans il y a | 0
Parallel programming with createJob
Hi Daniel, The problem is in the first line of code where you open a matlabpool. This is not required when using jobs and tas...
plus de 11 ans il y a | 2
| A accepté
Is it okay to use matlabpool in multiple matlab sessions?
By default matlabpool will try and use all the workers available in a cluster. For example if you have 16 workers in a cluster a...
plus de 11 ans il y a | 0
error using matlabpool open local in a cluster
Hi Jhih-An If I understand correctly, you are submitting jobs to a cluster, which attempt to open a matlabpool on the cluster...
plus de 11 ans il y a | 0
Differences createCommunicatingJob( ..., 'Type','pool') and ...'Type', 'SPMD')
Both spmd and parfor require a matlabpool to be open to send their work to each worker in the pool. You can create the matlabpoo...
plus de 11 ans il y a | 1
| A accepté
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