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[glance] worker, thread, taskflow interplay

We are trying to figure out how these two settings interplay in:


Just setting workers makes a bit of sense, and based on our testing:
=0 creates one process
=1 creates 1 plus 1 child
=n creates 1 plus n children

Are there green threads (i.e. coroutines, per https://eventlet.net/doc/basic_usage.html) within every process, regardless of the value of workers? Does max_workers affect that?

We have read some Glance doco, hunted about various bug reports[1] and other discussions online to get some insight, but I think we're not clear on it. Can anyone explain this a bit better to me? This is all in Rocky.

Thank you,

[1] https://bugs.launchpad.net/glance/+bug/1748916