[gmx-users] loab imbalance.

[Mark Abraham]

On 6/04/2010 5:39 PM, lina wrote:
> Hi everyone,
>
> Here is the result of the mdrun which was performed on 16cpus. I am not
> clear about it, was it due to using MPI reason? or some other reasons.
>
> Writing final coordinates.
>
>   Average load imbalance: 1500.0 %
>   Part of the total run time spent waiting due to load imbalance: 187.5 %
>   Steps where the load balancing was limited by -rdd, -rcon and/or -dds:
> X 0 % Y 0 %
>
> NOTE: 187.5 % performance was lost due to load imbalance
>        in the domain decomposition.

You ran an inefficient but otherwise valid computation. Check out the 
manual section on domain decomposition to learn why it was inefficient, 
and whether you can do better.

Mark

>          Parallel run - timing based on wallclock.
>
>                 NODE (s)   Real (s)      (%)
>         Time:  52292.000  52292.000    100.0
>                         14h31:32
>                 (Mnbf/s)   (GFlops)   (ns/day)  (hour/ns)
> Performance:    523.244     19.720     16.523      1.453
>
> Thanks and regards,
>
> lina
>
> P.S I used the ngmcheck found it's okay, later analysis shown
> reasonable.