Are EventWriters only called on master processes?

[AyushExel]

I want to perform certain operations that should not be repeated across other DDP processes( non 0 rank processes). Can I use EventsWriters to create such functionalities and log the result to event storage for other processes to access? Or are there other recommend ways of doing this.

[ppwwyyxx]

EventWriters only run on master processes and https://detectron2.readthedocs.io/en/latest/modules/utils.html#detectron2.utils.comm.is_main_process is used to check.

[AyushExel]

Awesome. Thanks