[petsc-dev] WTF

[Barry Smith]

   Who are these people and why to they have this webpage?

    Almost for sure they are doing no process binding and no proper assignment of processes to memory domains. In addition they are likely filling up all the cores on the first node before adding processes to the second core etc. If the studies had been done properly there should be very little fail off on the strong scaling in going from 1 to 2 to 4 processes and even beyond. Similarly the huge fail off in going from 4 to 8 to 16 would not occur for weak scaling.

   Barry

   
> On Jun 29, 2016, at 7:47 PM, Matthew Knepley <knepley at gmail.com> wrote:
> 
> 
> 
>   http://guest.ams.sunysb.edu/~zgao/work/airfoil/scaling.html
> 
> Can we rerun this on something at ANL since I think this cannot be true.
> 
>    Matt
> 
> -- 
> What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.
> -- Norbert Wiener