Data logged from a forked child process does not show up in the viewer.

[Victorlouisdg]

Describe the bug
Data logged from a forked child process does not show up in the viewer. This used to work in rerun version 0.4, but doesn't anymore in 0.7. I'm logging from Python, if I start child processes with the "fork" method (default on Unix), no logs come through. However, if I set multiprocessing.set_start_method("spawn"), the logging works as expected.

To Reproduce

• Install rerun 0.7.
• Run the python multiprocessing example from the current main branch (with the @rr.shutdown_at_exit line commented out.)

Expected behavior
I expected to see logs from 4 processes, as in the screenshot on the example page, however I only see the log from the parent process.

Screenshots

Desktop:

• OS: Ubuntu 20.04

Rerun version
rerun_py 0.7.0 [rustc 1.69.0 (84c898d65 2023-04-16), LLVM 15.0.7] x86_64-unknown-linux-gnu prepare-0.7 9cf3033, built 2023-06-16T15:47:32Z

[Wumpf]

I think this is a duplicate to #1921 which got fixed on main.
Any chance you could give this a spin with the latest dev-build via pip install --pre -f https://build.rerun.io/commit/96f5dde/wheels --upgrade rerun-sdk?

[Victorlouisdg]

Thanks, I can confirm that solves my issue. After installing that build, all 4 tasks show up in the viewer as expected.