Is there a way to start a parellel pool with maximum available workers as the cores on the machine?

Is there a way to start a parellel pool with maximum available workers as the cores on the machine?

I am using a compiled code which then is being run on a cluster, each cluster node can have a different number of available cores. Is there a way to start parpool with the maximum possible amount of workers? If I start pool = parpool('local'); I only get 12 workers even though on the node, where such code is run, I have 32 cores allocated.

[KSSV]

Check the parallel preferences, there you can increase the number of workers.

[Leos Pohl]

But this is compiled code.

Answer 1

[Raymond Norris]

pool = parpool('local',maxNumCompThreads);

Alternatively, if you're running this through a scheduler (e.g. PBS), you could query the scheduler first.

% Query for available cores (assume either Slurm or PBS)                                                                                             
sz = str2num([getenv('SLURM_CPUS_PER_TASK') getenv('PBS_NP')]); %#ok<ST2NM>                                                                          
if isempty(sz)
    % Not running through a scheduler, get default size
    sz = maxNumCompThreads; end
pool = parpool('local',sz);