Re: [ViennaCL-support] Preconditioner issues with CG

[Rick F. <ri...@ar...>]

After looking at the original paper on which the chow_patel_icc
preconditioner is based, it seems that convergence for the preconditioner
is guaranteed theoretically if a fixed point exists for the matrix.
However, overflow can occur in practice which will lead to lack of
convergence. In lieu of more detailed investigation, it seems likely that
my matrix is inducing overflow during the preconditioner calculation which
leads to lack NaNs during the CG solve. If any experts could comment on
this possibility, please do so. Have others encountered this issue?