I am trying to run a MATLAB code with a computer system that has two cpus and each have 12 cores. But when I use fft or fft2 command it only uses 50% of computing power, i.e. only one cpu or only 12 cores. When I use parallel processing toolbox similar thing is shown. When I use "matlabpool open" also it says 12 workers not 24 workers. How can I use the potential 24 cores that are in two cpus on my machine for vector operation or parallel processing in MATLAB? Any help or information is greatly appreciated.