[Users] global reductions in specified domains

[Roland Haas]

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Hello Vassili,

>> how can i now perform the reduction on this "processor-local" 
>> quantity?
> You can use the same as for the first example that I gave:
Also, before I forget again: the reduction result will only be correct
at "coarse" timesteps ie when all refinement levels are aligned in
time. For the other steps you will mix current and past values from
coarse and fine levels (you are doing a 0th order interpolation in
time). Carpet will to 2nd order interpolation in time for reductions
if not all data is aligned in time.

Yours,
Roland

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