Barry,
I sent this email out, but apparently it failed to reach you.
On Tue, Mar 11, 2014 at 10:46 PM, Hong Zhang hzh...@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
I’d remove it.
Thanks
Barry
On Mar 13, 2014, at 9:49 PM, Hong Zhang hzh...@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 hzh...@mcs.anl.gov wrote:
Barry,
The hybrid Chebyshev was implemented
Barry,
Currently, we have following options for hybrid Chebyshev:
-ksp_chebyshev_hybrid: FALSE Use hybrid Chebyshev ()
-ksp_chebyshev_hybrid_chebysteps 2: Number of Chebyshev steps
in hybrid Chebyshev ()
-ksp_chebyshev_hybrid_eststeps 10: Number of adaptive/est steps in
hybrid Chebyshev
Beats me. It is worth keeping only if the “slight performance advantage” is
of practical use. Like while, for example, used in a multigrid smoother. If it
just makes a bad algorithm you won’t use anyways slightly better than it is not
work keeping
Barry
On Mar 14, 2014, at 2:20 PM, Hong
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.
Hong
On Tue, Mar 11, 2014 at 9:15 PM, Smith, Barry F. bsm...@mcs.anl.gov wrote:
There should be a functional interface for
Barry:
Beats me. It is worth keeping only if the slight performance advantage
is of practical use. Like while, for example, used in a multigrid smoother.
If it just makes a bad algorithm you won't use anyways slightly better than
it is not work keeping
It does not improve mg smoother:
This is Hong's code. I don't believe in this method. ;-)
Barry Smith bsm...@mcs.anl.gov writes:
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
On Mar 13, 2014, at 9:22 PM, Jed Brown j...@jedbrown.org wrote:
This is Hong's code. I don't believe in this method. ;-)
Yup and if Hong believes in it she should add the support.
But wait, you are questioning the publication of three gods of ad hoc
numerical linear algebra?? Howard
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
