[Ipopt] question about ipopt with ma86 or pardiso

[Greg Horn]

Sorry, little more info:

I solve problems of that order of magnitude and see significant
improvements with ma86. Which discretization are you using, for example
direct collocation / multiple shooting / single shooting?

On Wed, Jul 8, 2015 at 7:45 PM Greg Horn <gregmainland at gmail.com> wrote:

> 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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>> Ipopt at list.coin-or.org
>> http://list.coin-or.org/mailman/listinfo/ipopt
>>
>
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