Debao,
Please see
http://www.mcs.anl.gov/petsc/petsc-as/documentation/faq.html#efficient-assembly
It should resolve the difficulties.
Barry
On Apr 15, 2011, at 2:16 AM, Debao Shao wrote:
> Dear Petsc:
>
> I?m trying on Petsc iterative solver(KSPCG & PCJACOBI), but it?s strange that
> the two functions ?MatCopy? and ?MatSetValue? consume most of runtime, and
> the functions were not called frequently, just several times.
>
> My libpetsc.a is built as follows:
> 1, /config/configure.py --with-mpi=0 --with-debugging=0 -with-log=0
> -with-info=0
> 2, make all;
>
> It?s very appreciated to get your reply.
>
> Thanks a lot,
> Debao
>
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