Running MuJoCo headless on servers

[pecey]

Hi,

I was trying to run MuJoCo (using Gymnasium) in a headless mode on our server with CPUs, but whenever the code tries to import mujoco, it fails with the following error:

File "/home/u000/py3.9.8/lib/python3.9/site-packages/mujoco/egl/__init__.py", line 67, in <module>
    raise ImportError(
ImportError: Cannot initialize a EGL device display. This likely means that your EGL driver does not support the PLATFORM_DEVICE extension, which is required for creating a headless rendering context.

I have MUJOCO_EGL MUJOCO_GL and PYOPENGL_PLATFORM set. I am not sure what am I missing. Any pointers to what I should be looking at or workarounds?

[kevinzakka]

The variable is MUJOCO_GL.

[pecey]

Sorry, that was a typo and should have been MUJOCO_GL. Fixed it. I have MUJOCO_GL=egl set.

[kevinzakka]

Do you have a GPU?

[saran-t]

What GPU do you have?

[pecey]

No I was trying to run on a CPU-based server. Does MuJoCo require GPU to run? I believe earlier it used to run on CPU-based systems as well.

[pecey]

This is probably an issue with drivers at the compute node. It was working on the login node of the cluster but not on the compute nodes. Switching to osmesa worked for me.