Feature or enhancement

Proposal:

This is more of a development debugging tool, but the imports done in a child process due tomultiprocessing.set_forkserver_preload() have always had their errors silently ignored. In many situations this is desirable, we don't want to break forkserver. But it makes debugging and diagnosis of problems in the forkserver process hard, leading to silently lower performance.

Lets add an optional keyword argument to allow preloads to raise errors. This comes from work done originally in#99515 for issue#98552. PR#141859 is the modern take on this.

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

No response

Linked PRs

• gh-141860: Add on_error= keyword arg tomultiprocessing.set_forkserver_preload #141859