[petsc-users] Does float128 helps ksp solver convergence

[Gong Ding]

Thanks, the synopsys TCAD product announced they use 128 bit float for numerically stable reason.
I will try some more robust methods first.
float128 seems not compatible with most external direct solvers.
 
On Sun, Sep 18, 2011 at 17:07, Gong Ding<gdiso at ustc.edu> wrote:
Do you mean GMRES-like method will bebenefited from float 128?
It could be, especially if you use a finite difference Jacobian. If you suspect precision issues, you can try more robust orthogonalization -ksp_gmres_modifiedgramschmidt or -ksp_type gcr, or you can just try using float128.
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