[petsc-users] Does float128 helps ksp solver convergence

[Matthew Knepley]

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.

   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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