[PETSC #16696] Binary dump of SNES residuals

[Barry Smith]

> I can certainly use  SNESMonitorSet with a custom monitor that sets up a
> binary viewer for SNESMonitorResidual, but I'm being lazy.

  This is currently the way to go: should require 3 lines of code, create the binary
viewer, call SNESMonitorSet() and then destroy the viewer at the end. You
can make it one line of code by passing PETSC_BINARY_VIEWER_WORLD into the 
the SNESMonitorSet() call.

  It would be nice to have a very generally solution to this, so one could
easily direct to many different types of viewers from the options database.
Maybe a rework of VecView_Private() code being used in conjunction with the 
various -xxx_monitor_residual/solution/update options, for KSP, SNES and TS.
Do I have time to write it? Heck no, I don't even have time to read my email :-)

   Barry



On Mon, 10 Sep 2007, mspieg wrote:

> Apologies if this is obvious,  but is there a clean way to dump out SNES
> residuals (and or updates) (inside a DMMG) as binary vectors for debugging.
> 
> 
> I'm currently using
> 
> -snes_monitor_residual
> 
> which is lovely for visualizing the residuals but uses VecView with the
> default Viewer set to draw and it would be useful to have a command line
> option to change the viewer type to binary (if it doesn't already exist)
> 
> I can certainly use  SNESMonitorSet with a custom monitor that sets up a
> binary viewer for SNESMonitorResidual, but I'm being lazy.
> 
> Any and all help greatly appreciated.
> 
> cheers
> marc
> 
> 
> 
> ----------------------------------------------------
> Marc Spiegelman
> Lamont-Doherty Earth Observatory
> Dept. of Applied Physics/Applied Math
> Columbia University
> http://www.ldeo.columbia.edu/~mspieg
> ----------------------------------------------------
> 
>