Is OpenPBS able to manage GPUs when MIG is enabled?

Please refer:

https://openpbs.atlassian.net/wiki/spaces/PD/pages/2313453569/Nvidia+MIG+Support

Yes it would do the scheduling as stated in your query.

References above should help
Refer the guide: https://help.altair.com/2024.1.0/PBS%20Professional/PBS2024.1.pdf and
Nvidia MIG Support