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Hi I am trying to debug multi processes in python. This below is a portion of where I run multi-processes using Pool

pool = Pool(num_half_logical_cpus)
pool_result_dict = pool.starmap(process_batches, lstListSets)

However, I can't hit any breakpoints. Can anyone guide me to hit those breakpoints I set up?

Thanks!

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2 Answers 2

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Add this option to launch.json will let you debug multiple processes.

"subProcess": true,

Then it will hit the breakpoint then you are able to select which process you want to step through (F10). There will be a list of processes at the lower-left sub-window.

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2 Comments

Please forgive this question if it is dumb, but where is that launch.json file? I am using Visual Studio Community, and there is no launch.json file within my project directory or the Visual Studio installation directory. Every mention I can find online regarding either this error or that file seems to be specific to Visual Studio Code, rather than Visual Studio Community. And I'd prefer to not post a new, nearly-identical question that would just confuse other people searching for the Visual Studio Code answer.
@user3685427 VS Code and Visual Studio (Community) are 2 completely different IDEs. The question was specifically asked for VS Code. The mentioned file resides in .vscode/launch.json in the root of a project in VS Code.
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Click on "Run and Debug" tab.

Then click "create a launch.json file."

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Then click on "Python".

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Then click on "Python File" configuration.

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VSCode will create a "launch.json" file for you. At this point you will need to add "subProcess": true, as stated here https://stackoverflow.com/a/60529923/6121065

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And you are good to go. Now you may debug your code. You may need to tweak the configurations where needed.

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