[petsc-dev] Question About Petsc ILU

2011-12-29 Thread Jed Brown
On Thu, Dec 29, 2011 at 21:42, Dave Nystrom wrote: > I just browsed through the output of configure -help and don't see > suitesparse. I do see stuff for cholmod but not a download option for > cholmod. > You have to install it yourself. Tim Davis' installation plan is too much work to maintain

[petsc-dev] Question About Petsc ILU

2011-12-29 Thread Dave Nystrom
Jed Brown writes: > On Thu, Dec 29, 2011 at 21:42, Dave Nystrom tachyonlogic.com> wrote: > > > I just browsed through the output of configure -help and don't see > > suitesparse. I do see stuff for cholmod but not a download option for > > cholmod. > > You have to install it yourself. Ti

[petsc-dev] Question About Petsc ILU

2011-12-29 Thread Dave Nystrom
Jed Brown writes: > On Thu, Dec 29, 2011 at 19:30, Dave Nystrom > wrote: > > > Generally I use CG and LU from petsc. Cholesky runs slower than LU and I > > was > > told in a previous email that it was because of the extra data movement for > > Cholesky versus LU. I have also tried minres

[petsc-dev] Question About Petsc ILU

2011-12-29 Thread Dave Nystrom
Jed Brown writes: > On Thu, Dec 29, 2011 at 19:30, Dave Nystrom > wrote: > > > Generally I use CG and LU from petsc. Cholesky runs slower than LU and I > > was > > told in a previous email that it was because of the extra data movement for > > Cholesky versus LU. I have also tried minres

[petsc-dev] Question About Petsc ILU

2011-12-29 Thread Jed Brown
On Thu, Dec 29, 2011 at 19:30, Dave Nystrom wrote: > Generally I use CG and LU from petsc. Cholesky runs slower than LU and I > was > told in a previous email that it was because of the extra data movement for > Cholesky versus LU. I have also tried minres instead of CG and tend to get > reduced

[petsc-dev] Question About Petsc ILU

2011-12-29 Thread Dave Nystrom
Mark F. Adams writes: > > On Dec 29, 2011, at 12:45 PM, Dave Nystrom wrote: > > > Jed Brown writes: > >> On Thu, Dec 29, 2011 at 11:01, Dave Nystrom > >> wrote: > >> > >>> I have recently added the capability to have a separate preconditioning > >>> matrix in the petsc interface for t

[petsc-dev] Question About Petsc ILU

2011-12-29 Thread Mark F. Adams
On Dec 29, 2011, at 12:45 PM, Dave Nystrom wrote: > Jed Brown writes: >> On Thu, Dec 29, 2011 at 11:01, Dave Nystrom wrote: >> >>> I have recently added the capability to have a separate preconditioning >>> matrix in the petsc interface for the code I am working with. I have two >>> types of p

[petsc-dev] Question About Petsc ILU

2011-12-29 Thread Jed Brown
On Thu, Dec 29, 2011 at 11:01, Dave Nystrom wrote: > I have recently added the capability to have a separate preconditioning > matrix in the petsc interface for the code I am working with. I have two > types of preconditioning matrices that I have questions about. One is > tridiagonal and the o

[petsc-dev] Question About Petsc ILU

2011-12-29 Thread Matthew Knepley
On Thu, Dec 29, 2011 at 11:01 AM, Dave Nystrom wrote: > I have recently added the capability to have a separate preconditioning > matrix in the petsc interface for the code I am working with. I have two > types of preconditioning matrices that I have questions about. One is > tridiagonal and the

[petsc-dev] Question About Petsc ILU

2011-12-29 Thread Dave Nystrom
Jed Brown writes: > On Thu, Dec 29, 2011 at 11:01, Dave Nystrom wrote: > > > I have recently added the capability to have a separate preconditioning > > matrix in the petsc interface for the code I am working with. I have two > > types of preconditioning matrices that I have questions about

[petsc-dev] Question About Petsc ILU

2011-12-29 Thread Dave Nystrom
I have recently added the capability to have a separate preconditioning matrix in the petsc interface for the code I am working with. I have two types of preconditioning matrices that I have questions about. One is tridiagonal and the other is 7 diagonals. In both cases, the the diagonals are al