Agreed, the overwhelming output from -h is tremendously annoying, and I cannot always grep because I don't know what I'm grepping for :(
A On Mon, Apr 18, 2011 at 3:43 PM, Jed Brown <jed at 59a2.org> wrote: > Currently Matrix Options are printed in MatView_Private which is called > from many places, e.g. > > MatAssemblyEnd > MatZeroRowsColumns > MatZeroRows > MatLUFactorNumeric > MatCholeskyFactorNumeric > > The problem here is that in time-stepping or a multigrid solve, it's common > to have these functions called hundreds or thousands of times which is > really overwhelming to -help output. One solution would be to store on a > per-matrix basis whether help has been displayed and only view it once (this > implies caching all the -mat_view_* options in the Mat, or calling with > PetscOptionsGetBool after the first time). The options could even be moved > to MatSetFromOptions, but that doesn't get called nearly as much as we would > probably like. > > There is also the somewhat deeper problem of multiple objects with the same > prefix (often no prefix). This is most visible for matrices inside of > multigrid and/or fieldsplit. It is easy to have more than 20 matrices with > no prefix so even if the multiple-output problem above was solved, it would > still be fairly overwhelming. I think this is somewhat harder to fix because > it would imply a per-prefix log of whether the option has been printed. I > think that the one special case of no-prefix Mat would already be a > significant usability improvement. > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-dev/attachments/20110418/c3ccdfde/attachment.html>
