[petsc-users] Does float128 helps ksp solver convergence

[Gong Ding]

2011/9/18 Gong Ding<gdiso at ustc.edu>
 Hi,
 I always meed some linear system with condition number near 1e10, the ksp solver (BCGSL + ASM + ILU(1))with double presision
 seems painful to convergence.
Higher precision is unlikely to affect the convergence rate. It might help with loss of orthogonality.
Do you mean GMRES-like method will bebenefited from float 128?
   Matt  Will float 128 helps in this situation?
 And how about the performance degenerate for float 128 under i.e. XEON 5620 CPU compared with double?
 Thanks
Gong Ding
--
What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.
 -- Norbert Wiener
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