Thanks sir.
I now modify my code into following.
Everything works good.
-
// stage 1:
Vec x1, b2;
Vec x1, b2;
Mat A, P, F;
PC pc;
// solve first system
MatCreateAIJ(A, ...)
MatSetVaules(A, ...)
MatAssembleBegin(A, ...)
MatAssembleBegin(A, ...)
simpilfy to enhance a better performance?
>
> Thanks for your time.
>
>
>
> ------ 原始邮件 --
> 发件人: "Jose E. Roman" ;
> 发送时间: 2022年2月17日(星期四) 下午5:17
> 收件人: "459543524"<459543...@qq.com>;
> 抄送: "petsc-use
Since version 3.5, KSPSetOperators() will check if the passed matrix has the
same sparse pattern as the previously set one, so you don't have to do anything.
The list of changes in version 3.5 has this note:
"KSPSetOperators() no longer has the MatStructure argument. The Mat objects now
track
Sir, I have a problem when using petsc.
I want to solve a series of linear equations.
A1*x1=b1, A2*x2=b2, A3*x3=b3 ...
The A1,A2,A3 have the same sparstiy pattern.
I want to use MUMPS to solve the system.
In order to enhance performance, I want to reuse the symbolic factorization.
Here
Hi,
I am using the cray-petsc implementation on the NERSC system. Specifically,
I have implemented a runge kutta solver, and I need to solve a linear
system Ax = b several times per time step. I am using PETSC to interface
with the MUMPS solver for direct factorization.
The matrix A is constant
Tibo:
Replace
call KSPSetOperators(KSP_A, A, A, DIFFERENT_NONZERO_PATTERN, ierr)
with
call KSPSetOperators(KSP_A, A, A, SAME_NONZERO_PATTERN, ierr)
Run your code with option '-log_summary' to see the number of calling
MatLUSymbolic() and MatLUNumeric().
Hong
I am using the cray-petsc
On Thu, Mar 14, 2013 at 2:52 PM, Thibault Faney tibo at berkeley.edu wrote:
Hong:
thank you for your answer.
I can replace DIFFERENT_NONZERO_PATTERN by SAME_NONZERO_PATTERN, however
this will give me the wrong answer as the zero pattern changes from a time
step to another (e.g. the matrix A
Thank you this works perfectly.
On Thu, Mar 14, 2013 at 4:20 PM, Hong Zhang hzhang at mcs.anl.gov wrote:
On Thu, Mar 14, 2013 at 2:52 PM, Thibault Faney tibo at berkeley.edu wrote:
Hong:
thank you for your answer.
I can replace DIFFERENT_NONZERO_PATTERN by SAME_NONZERO_PATTERN, however
