[petsc-dev] How to dump matrix in petsc

Dave Nystrom dnystrom1 at comcast.net
Fri Jun 15 08:20:34 CDT 2012

Jed Brown writes:
 > On Sun, Jun 10, 2012 at 10:07 AM, Dave Nystrom <dnystrom1 at comcast.net>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.

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