[Trilinos-Users] [EXTERNAL] How to test scaling from a trilinos build

John Cary cary at colorado.edu
Wed Mar 24 08:05:03 MST 2021



Thanks, Chris, thanks Jonathan,

I have found these executables, and we are doing scaling studies now.

Will report....John



On 3/23/21 9:42 PM, Siefert, Christopher wrote:
> John,
>
> There are some scaling examples in trilinoscouplings/examples/scaling 
> (example_Poisson.cpp and example_Poisson2D.cpp) that use the old stack 
> and might do what you need.
>
> -Chris


On 3/23/21 7:48 PM, Hu, Jonathan wrote:
> Hi John,
>
>     ML has a 2D Poisson driver in 
> ml/examples/BasicExamples/ml_preconditioner.cpp.  The cmake target 
> should be either "ML_preconditioner" or "ML_preconditioner.exe". 
> There's a really similar one in ml/examples/XML/ml_XML.cpp that you 
> can drive with an XML deck.  Is this what you're after?
>
> Jonathan
>
> On 3/23/21, 5:47 PM, "Trilinos-Users on behalf of John Cary" 
> <trilinos-users-bounces at trilinos.org on behalf of cary at colorado.edu> 
> wrote:
>
>      We are still using the old stack: ML, Epetra, ...
>
>      When we run a simple Poisson solve on our cluster (32 
> cores/node), we
>      see parallel efficiency drop to 4% on one node with 32 cores.  So we
>      naturally believe we are doing something wrong.
>
>      Does trilinos come with a simple Poisson-solve executable that we 
> could
>      use to test scaling (to get around the uncertainties of our use of
>      trilinos)?
>
>      Thx.......John Cary
>
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