[petsc-dev] [petsc-maint] circular dependency [nightlybuilds did not catch]

[Jed Brown]

Václav Hapla <vaclav.hapla at erdw.ethz.ch> writes:

> 4. května 2019 14:21:31 GMT+03:00, Jed Brown <jed at jedbrown.org> napsal:
>>Noting this historic event of Barry endorsing the addition of a new
>>acronym with no specific demonstrated need.
>>
>>Note that most/all packages contain objects other that that which they
>>are named after.  ksp/pc/, dm/label/, mat/partition/, snes/linesearch,
>>etc.
>
> At least DM contains Labels, 

Some DM implementations use DMLabel.

> KSP contains PC, 

Yet there is PCKSP.

> MatPartitioning contains Mat, 

This is the opposite inclusion.

> SNES contains Linesearch, right?  Although in case of pc, I think it
> deserves 1st level.

A PC and a KSP both do the same thing (approximate the action of the inverse).

> Whereas e.g. Layout, SF, Section do not contain IS and also otherwise they are basically unrelated except they all arrange some kind of index mapping. And there are multiple utils ar different levels and nobody knows where to put what. Plus all those have absolutely nothing in common with Vec.

Vec uses Layout and IS.  VecScatter intimately uses all of these and is
needed for almost anything to do with parallel vectors.