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
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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...
7 månader ago | 1
Accelerating code wont work
The matrix operations you are using (mldivide and matrix multiplication) are already implicitly multi-threaded and will use all ...
ungefär ett år ago | 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...
ungefär ett år ago | 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...
nästan 6 år ago | 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...
mer än 8 år ago | 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...
nästan 9 år ago | 0
| accepted
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>
nästan 10 år ago | 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...
ungefär 10 år ago | 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...
ungefär 10 år ago | 2
| accepted
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...
ungefär 10 år ago | 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...
mer än 10 år ago | 1
| accepted
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...
mer än 10 år ago | 1
| accepted
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...
mer än 10 år ago | 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...
mer än 10 år ago | 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...
mer än 10 år ago | 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_...
mer än 10 år ago | 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...
mer än 10 år ago | 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 ...
nästan 11 år ago | 2
| accepted
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...
ungefär 11 år ago | 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...
mer än 11 år ago | 0
| accepted
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...
mer än 11 år ago | 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...
mer än 11 år ago | 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...
mer än 11 år ago | 0
| accepted
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...
mer än 11 år ago | 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...
mer än 11 år ago | 1
| accepted
Parallel programming: defining tasks
Hi Daniel, See my answer to your other related question: http://www.mathworks.com/matlabcentral/answers/62944-parallel-progr...
nästan 12 år ago | 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...
nästan 12 år ago | 2
| accepted
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...
nästan 12 år ago | 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...
nästan 12 år ago | 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...
nästan 12 år ago | 1
| accepted
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