- Increase the available memory for the Docker container. MATLAB can be memory-intensive, so if the container doesn't have enough memory allocated, it may cause the connection to be lost.
- Check your network connection. Make sure the Docker container has access to the internet and that there are no network restrictions that may interfere with the MATLAB engine.
- Try using a different version of MATLAB. Some versions of MATLAB may have compatibility issues with certain Python environments. You can refer to System Requirements for MATLAB Engine API for Python - MATLAB & Simulink (mathworks.com) and Versions of Python Compatible with MATLAB Products by Release - MATLAB & Simulink (mathworks.com)
- Try starting the MATLAB engine with the -nojvm option. This will start the MATLAB engine without the Java Virtual Machine,that can help reduce memory usage and improve stability.
- Try using a different Python version. Some users have reported issues with MATLAB engine in Python 3.8, so it may be worth trying a different version of Python, such as 3.7 or 3.9.
Matlab engine starting error in Python (docker)
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Hi,
I am using Matlab with Python in a docker (cloud) environment. The installation was okay. But starting matlab engine (2022b) in Python (3.8) returns the following error:
>>> import matlab.engine
>>> eng = matlab.engine.start_matlab()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/matlab/.local/lib/python3.8/site-packages/matlab/engine/__init__.py", line 130, in start_matlab
eng = future.result()
File "/home/matlab/.local/lib/python3.8/site-packages/matlab/engine/futureresult.py", line 67, in result
return self.__future.result(timeout)
File "/home/matlab/.local/lib/python3.8/site-packages/matlab/engine/matlabfuture.py", line 87, in result
handle = pythonengine.getMATLAB(self._future)
matlab.engine.EngineError: Connection to process with Exchange: " " was lost.
Using background = True didn't work as well:
>>> future = matlab.engine.start_matlab(background=True)
>>> eng = future.result()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/matlab/.local/lib/python3.8/site-packages/matlab/engine/futureresult.py", line 67, in result
return self.__future.result(timeout)
File "/home/matlab/.local/lib/python3.8/site-packages/matlab/engine/matlabfuture.py", line 87, in result
handle = pythonengine.getMATLAB(self._future)
matlab.engine.EngineError: Connection to process with Exchange: " " was lost.
Can anyone help me identify the issue here? Thanks in advance!
0 Comments
Answers (1)
Rajeev
on 20 Feb 2023
The error message indicates that the connection to the MATLAB engine has been lost. This can happen for a number of reasons that include network issues, memory limitations, or other system constraints.
Here are some steps you can try to resolve this issue:
Have a nice day :)
3 Comments
Rajeev
on 21 Feb 2023
Hi @J.
You are correct that there is docker does not set any constraints on a container.
I meant the memory of your host system in this case.
You can refer to the docker documentation: https://docs.docker.com/config/containers/resource_constraints/#understand-the-risks-of-running-out-of-memory
and this stackoverflow answer: How to assign more memory to docker container - Stack Overflow for more info.
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