[petsc-users] Does float128 helps ksp solver convergence

[Jed Brown]

On Sun, Sep 18, 2011 at 17:07, Gong Ding <gdiso at ustc.edu> wrote:

> Do you mean GMRES-like method will be benefited 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.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20110918/fbfa717f/attachment.htm>