Note
There is overhead associated with calling Python® functions out-of-process. This behavior affects performance. MathWorks recommends calling Python functions in-process, which is the default mode.
MATLAB® can run Python scripts and functions in a separate process. Running Python in a separate process enables you to:
Use some third-party libraries in the Python code that are not compatible with MATLAB.
Isolate the MATLAB process from crashes in the Python code.
To run out-of-process, call the pyenv function with the "ExecutionMode" argument set to "OutOfProcess". For example, suppose that you want to create this list variable in the Python environment.
['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday']
To create this list out-of-process, set the MATLAB execution mode to "OutOfProcess". MATLAB displays information about your current Python environment.
pyenv(ExecutionMode="OutOfProcess")
ans =
PythonEnvironment with properties:
Version: "3.11"
Executable: "C:\Python311\pythonw.exe"
Library: "C:\windows\system32\python311.dll"
Home: "C:\Python311"
Status: NotLoaded
ExecutionMode: OutOfProcess
Create the variable.
py.list({'Monday','Tuesday','Wednesday','Thursday','Friday'})
ans =
Python list with no properties.
['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday']
MATLAB creates a process named MATLABPyHost.
pyenv
ans =
PythonEnvironment with properties:
Version: "3.11"
Executable: "C:\Python311\pythonw.exe"
Library: "C:\windows\system32\python311.dll"
Home: "C:\Python311"
Status: Loaded
ExecutionMode: OutOfProcess
ProcessID: "8196"
ProcessName: "MATLABPyHost"
Note
Clearing a Python object is asynchronous,? which means that the Python object might remain in Python after the invocation of a synchronous call. For example, in the following code it is possible that myList2 is created before myList is destroyed.
myList=py.list; clear myList myList2 = py.list;
The size of variables passed between Python and MATLAB is limited to 2 GB when you call a Python function out-of-process. This limit applies to the data plus supporting information passed between the processes.
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