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

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梅花
梅花 2024-3-26
编辑： Infinite_king 2024-3-26
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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回答（2 个）

Infinite_king
Infinite_king 2024-3-26
编辑：Infinite_king 2024-3-26
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.
Bruno Luong
Bruno Luong 2024-3-26

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