MatLab R2011a detects 8 physical cores when I only have 4!
2 views (last 30 days)
Show older comments
Hey! I have a computer that has a single Xeon X3480 (4 cores) CPU and 16 GB of PC-1333 RAM. This computer is currently running Windows Server 2008 R2. I am running MatLab R2011a. My problem is that when I run 'matlabpool open', MatLab gives me a pool of 8 workers when I only have 4 physical cores. In all my other machines, MatLab only gives me one worker per physical core. I am wondering whats wrong? I have checked all the properties of my local configuration and they are all on default. I have the "Number of workers available to scheduler (Cluster Size)" option empty so as far as I know it is supposed to give me only 4 workers. Thanks in advance!
0 Comments
Accepted Answer
Jan
on 19 Oct 2011
This means, that each core can process two threads at the same time. Therefore it is a good idea to start 8 workers.
0 Comments
More Answers (1)
Thomas
on 20 Oct 2011
Also if you do not want to use hyper-threading or run just 1 instalnce of matlab/physical core you can give the command
matlabpool open local 4
and matlab will open a local pool of only 4 workers ( I hope it would be on the 4 physical cores and not use hyper-threading on two cores and leave the other two cores unused..)
0 Comments
See Also
Categories
Find more on MATLAB Parallel Server in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!