[petsc-users] Scatter context for MatMult

[John Fettig]

Is there a scatter context available someplace that would allow me to
gather all of the elements of a vector that correspond to the ones
needed for a MatMult (MPIAIJ matrices)?  When you do a MatMult, I
presume it first scatters/gathers the ghost elements of the vector
being multiplied, can I use this scatter for a vectors outside of the
MatMult?

Thanks,
John