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[Bruno Chareyre <question665405@xxxxxxxxxxxxxxxxxxxxx>]

Question #665405 on Yade changed:
https://answers.launchpad.net/yade/+question/665405

Bruno Chareyre posted a new comment:
Hi,
I would say this is not a misfeature that one wants to avoid. Instead it is an opportunity to assess indeterminism, which is in most cases inherent to the underlying physics.
Re-ordering the bodies (i.e renumbering) while keeping everything else the same would give similar fluctuations in single thread yet I don't think anyone would claim that one numbering is better than another.
The single thread result is like selecting one numbering and sticking to it, while parallel runs are like renumbering randomly each time.
If the fluctuations are about 100% it is an interesting indication that the physical problem could be somehow ill-posed. Like asking in which direction a sphere will fall if you put it right on the top of a needle.
Regards
Bruno

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