[petsc-dev] Chebyshev hybrid option has no functional interface or man pages

[Barry Smith]

  I’d remove it.

  Thanks

  Barry

On Mar 13, 2014, at 9:49 PM, Hong Zhang <hzhang at mcs.anl.gov> wrote:

> Barry,
> I sent this email out, but apparently it failed to reach you.
> 
> On Tue, Mar 11, 2014 at 10:46 PM, Hong Zhang <hzhang at mcs.anl.gov> wrote:
>> Barry,
>> The hybrid Chebyshev was implemented for experimentation, but had not
>> been found useful, so the default is set as FALSE.
>> I can add a functional interface though.
> 
> As you and Jed do not believed in this method, and my experiments had
> not shown any useful of it.
> Shall we keep it or remove it?
> 
> Hong
> 
>> 
>> On Tue, Mar 11, 2014 at 9:15 PM, Smith, Barry F. <bsmith at mcs.anl.gov> wrote:
>>> 
>>>  There should be a functional interface for turning this on and off with a manual page.
>>> 
>>>   Barry
>>> 
>>>  /*
>>>   Use hybrid Chebyshev.
>>>   Ref: "A hybrid Chebyshev Krylov-subspace algorithm for solving nonsymmetric systems of linear equations",
>>>         Howard Elman and Y. Saad and P. E. Saylor, SIAM Journal on Scientific and Statistical Computing, 1986.
>>>   */
>>>  ierr = PetscOptionsBool("-ksp_chebyshev_hybrid","Use hybrid Chebyshev","",cheb->hybrid,&cheb->hybrid,NULL);CHKERRQ(ierr);
>>>  ierr = PetscOptionsInt("-ksp_chebyshev_hybrid_chebysteps","Number of Chebyshev steps in hybrid Chebyshev","",cheb->chebysteps,&cheb->chebysteps,NULL);CHKERRQ(ierr);
>>>  ierr = PetscOptionsInt("-ksp_chebyshev_hybrid_eststeps","Number of adaptive/est steps in hybrid Chebyshev","",cheb->eststeps,&cheb->eststeps,NULL);CHKERRQ(ierr);
>>>  ierr = PetscOptionsBool("-ksp_chebyshev_hybrid_purification","Use purification in hybrid Chebyshev","",cheb->purification,&cheb->purification,NULL);CHKERRQ(ierr);
>>> 
>>> 
>>>