[Ipopt] question about ipopt with ma86 or pardiso

[Greg Horn]

Have you set the environment variable?
export OMP_NUM_THREADS=8

On Wed, Jul 8, 2015 at 1:05 PM Ian Washington <washinid at mcmaster.ca> wrote:

> Hi All,
>
> Quick question.
>
> At what point in the problem size (variables/constraints) does using a
> parallel shared-memory linear solver like ma86, ma97 or pardiso become
> beneficial in terms of speedup.
>
> I am trying to do some timings on a sparse discretized optimal control
> problem with about 30000 variables and 20000 equalities (i.e. 10000
> dof). Currently, ma86 and pardiso require more time than the serial ma27
> solver for the same amount of iterations. I am using openmp 3.1 with
> gcc-4.7.3 on linux 64bit.
>
> I am guessing my problem is just too small at present.
>
> Anyone have any thoughts?
>
> Thanks,
> Ian.
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