MATLAB Only Using One CPU on Dual-CPU System

I have a dual 12-core, 24-thread system. MATLAB, for some reason, is only fully utilizing one of the CPUs. It spawns 24 threads, but all of them seem to run on a single CPU.

Ideally, I would expect either:

• 12 threads per CPU (24 threads total), or
• 24 threads per CPU (48 threads total, if MATLAB scales that way),

but not 24 threads on one CPU.

I’ve attached a screenshot showing the CPU usage. Can anyone please help me understand why this is happening and how to fix it so MATLAB properly distributes threads across both CPUs?

Answer 1

[Taylor]

Have you tried configuring your local cluster profile? You may also need to disable hyper-threading in BIOS and configure your processor affinity.

I think the following posts will be useful for you:

https://www.mathworks.com/matlabcentral/answers/478922-how-to-make-matlab-use-all-cpu-cores

https://www.mathworks.com/matlabcentral/answers/471063-can-parallel-computing-toolbox-not-parallellise-over-multiple-cpus

https://www.mathworks.com/matlabcentral/answers/1454149-how-to-use-all-cores