[WIP] Harmonize solvers #1030
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[WIP] Harmonize solvers #1030
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Replace haphazard `.status`, logging, and divergence warnings
Allow selection from criteria supported by particular solver suite
Logging prevents app from reporting exception to commandline
PETSc applies preconditioners by default
`Solver._solve()` is common and has access to FiPy objects. `Solver._solve_()` is defined for each solver suite and takes L, x, b suitable for particular solver suite.
`Norm2()` returns a 1-element array for some dain-bramaged reason.
Make it agree with other solver suites
Default MultilevelDD doesn't work.
All (most) suites are flakey with this problem. (Trilinos only fails in parallel if the rest of the examples/diffusion tests have already been run.)
RHS >> initial residual, so solver never does anything with (new) default criterion for convergence.
Still passes and doesn't throw obnoxious warnings from PETSc or Trilinos
It just gets in the way
Default solver tolerances have been relaxed from 1e-10 to 1e-5 to agree with default of most solver suites. This should save on compute time and, in most cases, this is adequate for existing tests to pass. Where it is not, either adjust the solver or adjust the test.
Originally tried to make it do logging, too, but I couldn't figure out how to get it to log in the correct scope. Separating timing from logging substantially simplifies the logic at a modest cost in LoC at point of use.
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