[Users] splitting grid ARRAY along given direction only

[Roland Haas]

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Hello Erik, all,

> There is a parameter "no_split_direction" that ensures that a
> certain direction is never split over multiple processes. This
> parameter affects all grid variables. You would want two
> no-split-directions, but probably only for this group.
Yes I would want two of the no-split-directions and ideally only for
this one group (I had looked at no-split-direction and the
aspect_ratio parameters though could not really make it work with those).

> The cleanest way to address this would be to introduce new
> keywords next to "default" and "constant" that describe which
> directions should be split. Alternatively, group tags specifying
> this could be introduced. At the lower level,
> SplitRegionsMaps_Automatic and friends could receive an additional
> argument describing which directions should not be split; probably
> a bvect.
An extra keyword will have to go all the way through the flesh and the
perl scripts that parse interface.ccl. I had hoped to avoid that extra
level of effort :-) A group tag that is then passed on a a bvect would
seem like a simple Carpet-only solution. It certainly would be the
fastest solution. On the other hand I feel that the group tags are
already being used for too many things so I might end up going the
Cactus-flesh way in the end.

Thank you for the suggestions.

Yours,
Roland

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