just information for you. I tested trunk version withe PARDISO for a simple groundwater flow with different tolerance numbers but didn't see the problem. maybe the problem is specific to your problem setting or your environment. For example, deactivation of sub-domains doesn't work well with PARDISO.
On 22/07/15 17:37, Christof Beyer wrote:
yes, I'm sure the PARDISO solver is chosen, it is stated in the screen
output from OGS. I do not see the differences in all my models, though.
The problem I am trying to solve is quite big (2.3 mio grid cells) and
has a time variant source term (defined by a rfd curve), for which again
I have problems reproducing the correct numbers.
Am 22.07.2015 um 17:06 schrieb Norihiro Watanabe:
> hi Christof,
> i sometimes use pardiso but have never noticed the behavior. as you
> wrote, a solver tolerance in num files should have no influence on
> PARDISO. there could be invalid memory access somewhere in the code...
> are you sure you set 805 as a solver type? otherwise, iterative
> solvers from lis will be used.
> On 22 July 2015 16:43:37 CEST, Christof Beyer <firstname.lastname@example.org> wrote:
>> Dear all,
>> maybe somebody with a little experience in usage of the PARDISO solver
>> can help me out with this:
>> Reading the code in Linear_EQS::Solver(CNumerics* num), it seems to me
>> that all parameters set for the PARDISO solver are hardcoded in OGS
>> (except for no. of threads), and specification of the linear solver
>> parameters (error_tolerance max_iterations precond) in *.num should
>> no effect on the solution, as PARDISO is a direct solver. Nevertheless,
>> I see (small) differences in the solution when specifying different
>> values for the error_tolerance. Is there a point I'm completely missing
>> about the operation of PARDISO?
>> Bests, Christof
Norihiro Watanabe, Dr.-Ing.
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