> Yes, I experimented this multithread variability in different situations. > Still not sure if it is a rounding error propagation (that's the > official explanation - different roundings for ordering of operations), > or if there are really errors. > The differences look preety big for something supposed to be just > rounding errors, but I was initiating simulations with loose clouds. > Maybe that is the reason. As already explained (search the archive), if you use cundall's damping, the rounding errors can propagate infinitely quickly.
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