Use MATLAB Coder to convert matlab code to mex without using multi-threading

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梅花
梅花 il 26 Mar 2024
Modificato: Infinite_king il 26 Mar 2024
My code is as follows
function all_Spins = simulate_particles(num_particles, num_steps, all_Spins, SpinLocOri, Gamma, magnetic_field, GdAmp, StepT, spherePositions, sphereRadii, Lx_intra, Ly_intra, Lz_intra, penetration, Lx_extra, Ly_extra, Lz_extra)
parfor mun = 1:num_particles
particle = all_Spins(mun, :);
particle = simulate_particle_motion(num_steps, particle, SpinLocOri, Gamma, magnetic_field, GdAmp, StepT, spherePositions, sphereRadii, mun, Lx_intra, Ly_intra, Lz_intra, penetration, Lx_extra, Ly_extra, Lz_extra);
all_Spins(mun, :) = particle;
end
end
After using MATLAB Coder to convert to mex, I found that multi-threading was not used and my cpu was idle.

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Risposte (2)

Bruno Luong
Bruno Luong il 26 Mar 2024
Infinite_king
Infinite_king il 26 Mar 2024
Modificato: Infinite_king il 26 Mar 2024
Hi 梅花,
By default, MATLAB Coder generates code in which the parfor loop body runs in parallel using OpenMP.
In the code generation configuration object, you can enable 'OpenMP' as follows,
cfg = coder.config('mex');
cfg.EnableOpenMP = true;
% generate code
codegen myFunction -config cfg
For more information, refer the following resources,
Enabling/Disabling OpenMP - https://www.mathworks.com/help/coder/ug/control-compilation-of-parfor-loops.html
MATLAB Answer related to OpenMP support - https://www.mathworks.com/matlabcentral/answers/237411-can-i-make-use-of-openmp-in-my-matlab-mex-files?#answer_190619
Parfor - https://www.mathworks.com/help/coder/ref/parfor.html
Hope this is helpful.

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