Error: a forked child should not open a graphics device about furrr HOT 4 CLOSED

I've added a new issue for a few documentation updates. Thanks!

from furrr.

My guess is that this is a multicore issue having to do with shared memory. multiprocess picks multicore on Linux and Mac. Try explicitly using multisession, which should not use shared memory. On a Windows computer I can run this in multisession mode with no issues.

from furrr.

A quick google search also brings up this thread, where Henrik (the future author this is built on) asks a question about this kind of thing and get's a response of, "Some back-ends (like X11) cannot be run in forked environment, so you can't use them."

So my advice would just be to stay away from forked + graphics and just use plan(multisession) here.

http://r.789695.n4.nabble.com/parallel-Race-condition-concern-regarding-graphics-devices-in-a-multi-thread-environment-td4663471.html

Let me know if that works for you

Edit) In fact, your exact error message listed in the Issue title is in that thread, so I'm pretty sure that's the problem. I don't think it's anything furrr or future should do to prevent against.

from furrr.

Thanks! Indeed it works for me, albeit with the drawbacks that multisession has over multicore. I think something about this issue could be mentioned in the manual (if it is not already and I missed it!).

from furrr.