[petsc-dev] ts/examples/tutorials/ex11 test garbage?

[Richard Katz]

> It shouldn't "crap out", it should reject the step, shorten it, compute a fresh Jacobian (if the Jacobian was being lagged), and try again. Thanks for reminding me that this should be done sooner rather than later.

Jed,

For my uses this is a very important feature. 

Two questions:

- Will the step size increase after a shorter step has been successful?  Will it go immediately back to the maximum size?

- Will it be possible to set a minimum step size, below which the TSSolve() or TSStep() will "crap out?"

It is obviously important that TS not just chug along without error if a timestep fails.

Cheers
Rich


>  
> 
>  Isn't this test data from something that is failing? Should it not be there?
> 
> Yeah, was that example converging when you first created it?
> 
> changeset:   15757:896f032fd4a8
> parent:      15750:1f53ec9d4e00
> user:        Barry Smith bsmith at mcs.anl.gov
> date:        Fri Apr 23 15:03:44 2010 -0500
> summary:     some code cleanup and further work on DMMG version 2
> 
> diff --git a/src/ts/examples/tutorials/ex7.c b/src/ts/examples/tutorials/ex11.c
> copy from src/ts/examples/tutorials/ex7.c
> copy to src/ts/examples/tutorials/ex11.c
> --- a/src/ts/examples/tutorials/ex7.c
> +++ b/src/ts/examples/tutorials/ex11.c
> [changes]

________________________________
Richard Foa Katz
Dept Earth Sciences, Univ Oxford
http://foalab.earth.ox.ac.uk