[Nek5000-users] Odd lx1 numbers & lxd

[nek5000-users at lists.mcs.anl.gov]

As long as lxd ~ 3/2 lx1, you're generally ok.

lx1 and lxd being odd is very bad for certain platforms
(right now, the only one is BG/P or BG/L).   On these platforms
it is possible to get much higher performance for even lx1, lxd,
etc.

Paul


On Mon, 26 Apr 2010, nek5000-users at lists.mcs.anl.gov wrote:

> Hello,
>
> I have a question about lx1 and de-aliasing. Is it OK to have odd number as
> lx1 ? If yes, in such cases one might violate the 3/2 rule for lxd .
> Or only even numbers are recommended ?
>
> Thanks
> Shriram
>