[gmx-users] DD load balancing is limited by minimum cell size in dimension Z

[Mark Abraham]

On 16/04/2012 8:43 PM, Gavin Melaugh wrote:
> Hi all
>
> What does the following note mean in the log file
>
> DD  load balancing is limited by minimum cell size in dimension Z
> Is is purely a performance related issue ?

Yes. See 3.17.2 for description of DLB. Various algorithms constrain 
minimum cell sizes. Perhaps due to inhomogeneous particle distribution, 
ideal load balance would require violation of the minimum size. So 
GROMACS does the correct thing - compromises load balance (and thus 
performance) and lets you know there's an issue.

Mark