Messages in this thread | | | Date | Sat, 21 Apr 2007 09:34:07 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: [REPORT] cfs-v4 vs sd-0.44 |
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On Sat, 21 Apr 2007, Willy Tarreau wrote: > > If you remember, with 50/50, I noticed some difficulties to fork many > processes. I think that during a fork(), the parent has a higher probability > of forking other processes than the child. So at least, we should use > something like 67/33 or 75/25 for parent/child.
It would be even better to simply have the rule: - child gets almost no points at startup - but when a parent does a "waitpid()" call and blocks, it will spread out its points to the childred (the "vfork()" blocking is another case that is really the same).
This is a very special kind of "priority inversion" logic: you give higher priority to the things you wait for. Not because of holding any locks, but simply because a blockign waitpid really is a damn big hint that "ok, the child now works for the parent".
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