Use MATLAB Coder to convert matlab code to mex without using multi-threading
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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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Answers (2)
Infinite_king
on 26 Mar 2024
Edited: Infinite_king
on 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
Hope this is helpful.
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