Jed Brown writes:

On Sun, Jun 10, 2012 at 10:07 AM, Dave Nystrom <[email protected]>wrote:

...

Is there an easy way to dump a matrix and rhs in petsc? I have a particular system that has been challenging to solve with petsc other than using direct solves. Also, if I could dump the linear system, is it acceptable to post it on this email list so that someone who knows more about petsc and linear solvers could investigate it if they had the time and inclination?

Run with -ksp_view_binary (it produces a file called 'binaryoutput')

Don't email large files to the list. You can send up to a few MB to petsc-maint. If you can't host larger files yourself, anonymous ftp to ftp.mcs.anl.gov, cd incoming, and upload the file (preferably with a unique name), then tell us the file name.

Once I have my 'binaryoutput' file, is there a petsc example that shows how to read this file back into petsc and use it? I'm not finding online documentation about this option.