HP MLIB User's Guide Vol. 2 7th Ed.

Chapter 11 Introduction to Distributed SuperLU 771
Improve the computed solutions to systems of linear equations
pdgsrfs_ABXglobal/pzgsrfs_ABXglobal
any element of A or B that makes X(j) an exact
solution).
stat
(output)
Record the statistics about the refinement steps.
info
(output) = 0
: successful exit
> 0: if info= -i, the i-th argument had an illegal value.