Thanks Barry!
Qin
On Friday, June 12, 2020, 6:18 PM, Barry Smith wrote:
For the problem sizes you describe with sparse matrices the PETSc built in
one is competitive with the external solvers, sometimes faster, it is not worth
using the external solvers for such small problems. The
On Fri, Jun 12, 2020 at 1:18 PM Matthew Knepley wrote:
> On Fri, Jun 12, 2020 at 12:49 PM Qin Lu via petsc-users <
> petsc-users@mcs.anl.gov> wrote:
>
>> Hello,
>>
>> I plan to solve a small sparse linear equation system using the direct
>> solver, since the number of unknowns is small (less
For the problem sizes you describe with sparse matrices the PETSc built in
one is competitive with the external solvers, sometimes faster, it is not worth
using the external solvers for such small problems. The external solvers have
much more elaborate implements of sparse factorizations and
Thanks Matthew and Mark!
Qin
On Friday, June 12, 2020, 12:22:08 PM CDT, Mark Adams
wrote:
On Fri, Jun 12, 2020 at 12:56 PM Qin Lu via petsc-users
wrote:
Hello,
I plan to solve a small sparse linear equation system using the direct solver,
since the number of unknowns is small
On Fri, Jun 12, 2020 at 12:56 PM Qin Lu via petsc-users <
petsc-users@mcs.anl.gov> wrote:
> Hello,
>
> I plan to solve a small sparse linear equation system using the direct
> solver, since the number of unknowns is small (less than 1000). Here I got
> a few questions:
>
> 1. Is there a general
On Fri, Jun 12, 2020 at 12:49 PM Qin Lu via petsc-users <
petsc-users@mcs.anl.gov> wrote:
> Hello,
>
> I plan to solve a small sparse linear equation system using the direct
> solver, since the number of unknowns is small (less than 1000). Here I got
> a few questions:
>
> 1. Is there a general
Hello,
I plan to solve a small sparse linear equation system using the direct solver,
since the number of unknowns is small (less than 1000). Here I got a few
questions:
1. Is there a general guide line on the size of the system that direct solver
is more efficient than iterative solver?2. Is
