Messages in this thread | | | Date | Fri, 9 Oct 2015 08:55:42 +1100 | From | paul.szabo@sydney ... | Subject | Re: CFS scheduler unfairly prefers pinned tasks |
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Dear Mike,
>>> I see a fairness issue ... but one opposite to your complaint. >> Why is that opposite? ... > > Well, not exactly opposite, only opposite in that the one pert task also > receives MORE than it's fair share when unpinned. Two 100$ hogs sharing > one CPU should each get 50% of that CPU. ...
But you are using CGROUPs, grouping all oinks into one group, and the one pert into another: requesting each group to get same total CPU. Since pert has one process only, the most he can get is 100% (not 400%), and it is quite OK for the oinks together to get 700%.
> IFF ... massively parallel and synchronized ...
You would be making the assumption that you had the machine to yourself: might be the wrong thing to assume.
>> Good to see that you agree ... > Weeell, we've disagreed on pretty much everything ...
Sorry I disagree: we do agree on the essence. :-)
Cheers, Paul
Paul Szabo psz@maths.usyd.edu.au http://www.maths.usyd.edu.au/u/psz/ School of Mathematics and Statistics University of Sydney Australia
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