Memory leak when interfacing between Matlab and python

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Surat Asvapoositkul 2019-11-1

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https://ww2.mathworks.cn/matlabcentral/answers/488784-memory-leak-when-interfacing-between-matlab-and-python

编辑： Neil 2024-10-9

Hi. I have found a problem when I try to make communication between Matlab and python (using optimisation in matlab). I have built a model in Matlab and tried to use Scipy to optimise the parameters in the model. Therefore, I wrote an objective function in python and use "matlab.engine" to interface between the two. However, I have found that the simulation time in each iteration increases when I call Matlab engine.

With the code below, the simulation time keeps increasing after finishing eacg interation.

eng = matlab.engine.start_matlab()

def opt_pf(x):

y = eng.matlab_model(excel_path, x, nargout=0)

return y

gc.collect()

### Run optimisation

from scipy.optimize import minimize

res = minimize(opt_pf, x0, method='SLSQP', constraints=[eq_cons], options={'ftol': 1e-09, 'disp': True}, bounds=bounds)

I think that the optimizer canno't clear the cache from matlab.engine in each iteration.

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Shisui Uchiha 2023-9-1

编辑：Walter Roberson 2023-11-24

https://bastibe.de/2015-10-29-matlab-engine-leaks.html

Øyvind 2023-11-24

I have experienced similar issues (Matlab R2023b on Windows).

For me, it seems like the problem is mostly if running in ExecutionMode="OutOfProcess", while "InProcess" is better.

With OutOfProcess execution mode, I see that there is a process called matlabpyhost which ends up using tons of memory (as seen in Task Manager).

So to do this, use something like:

pyenv(ExecutionMode="OutOfProcess")

(Obviously, the InProcess vs OutOfProcess also affects other things, see https://se.mathworks.com/help/matlab/ref/pyenv.html )

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回答（3 个）

Donato 2023-8-16

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I am facing the same problem, we really need some support here.

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Clark 2023-12-28

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Me too! HUGE leaks... Sometimes swelling to 40 GB, when expecting maybe only 2GB

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Neil 2024-10-9

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编辑：Neil 2024-10-9

I encountered the same issue in MATLAB2023b. The attachments in the following old bug report looks helpful, but it is for a much much older version of MATLAB.

https://www.mathworks.com/support/bugreports/details/1319969