Matlab doesn't recognize all cores on my desktop

Hi. My desktop has two CPUs each of which has 12 cores. However, when I use the command 'parpool' in Matlab, it only recognizes 12 workers and not 24 ones. I also manually changed the number 12 in 'Parallel preferences' box from 12 to 24, but when I check the CPU monitor in 'Windows Task Manager', there are still 12 jobs that have been submitted by Matlab. I was wondering if anybody knows how to make Matlab to recognize all 24 cores?

Thanks, Reza

[Matt J]

Is your MATLAB version at least R2014a? See also here,

http://www.mathworks.com/matlabcentral/answers/131618-why-does-my-matlab-2014a-only-start-12-workers-when-i-ask-for-more

Answer 1

[Sean de Wolski]

pool =  parpool('local',24)

[Reza]

Thanks Sean for your answer, it helped. It seems you can't increase the 'NumWorkers' beyond 12 in Matlab2013b, but I tried it in Matlab2015a and it worked.

[Sean de Wolski]

Yes, the 12 worker limitation was removed in 14a I believe and is now 512 workers.