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RuntimeError: Cannot create multiple emulator instances per process #64

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ShaniGam opened this issue Jul 27, 2018 · 2 comments
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RuntimeError: Cannot create multiple emulator instances per process #64

ShaniGam opened this issue Jul 27, 2018 · 2 comments

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@ShaniGam
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ShaniGam commented Jul 27, 2018 •
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Trying to run 'CombatCars-Genesis' in a parallel algorithm (A3C/A2C) and get the error:
RuntimeError: Cannot create multiple emulator instances per process
Why isn't it possible to create more than one instance like with the Atari games?
@endrift
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endrift commented Jul 27, 2018

This is because the way libretro, the library that backs Gym Retro's emulator integrations, works. It simply is not possible to load the emulator into the process more than once with its model.

I can go into more details if you like but this is not a fixable problem, unfortunately. You'll need to use multiprocess shims.

@endrift endrift closed this as completed Jul 27, 2018
@endrift
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endrift commented Jul 27, 2018

See also https://github.com/MaxStrange/retrowrapper

squishyhuman pushed a commit to RetroAI/retro3 that referenced this issue Mar 2, 2023
@till2
Add a tutorial notebook for Blackjack-v1 (openai#64)
67ab18e
@arvganesh arvganesh mentioned this issue Mar 21, 2023
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@endrift @ShaniGam