[gmx-users] Load imbalance
carlajamous at gmail.com
Fri Jan 22 13:35:52 CET 2010
Yes, but I forgot to say that I got this note that followed:
5.4 % performance was lost because the PME nodes
had less work to do than the PP nodes.
You might want to decrease the number of PME nodes
or decrease the cut-off and the grid spacing.
On Fri, Jan 22, 2010 at 1:34 PM, Erik Marklund <erikm at xray.bmc.uu.se> wrote:
> Carla Jamous skrev:
> Hi everyone,
>> Lately I've been using gromacs version 3.3.3. Yesterday, I started
>> simulations in a cluster where gromacs version is 4.0.3.
>> After a run, I got this error message:
>> Average load imbalance: 0.5 %
>> Part of the total run time spent waiting due to load imbalance: 0.3 %
>> Steps where the load balancing was limited by -rdd, -rcon and/or -dds: X
>> 0 % Y 0 %
>> Average PME mesh/force load: 0.898
>> Part of the total run time spent waiting due to PP/PME imbalance: 2.7 %
>> I don't have a clue what this means & how can I fix it?
>> Please can anyone help?
>> Thank you
> This is no error message. 0.5 % load imbalance just means that the workload
> was distributed in a good way over procesors throughout your simulation.
> Erik Marklund, PhD student
> Laboratory of Molecular Biophysics,
> Dept. of Cell and Molecular Biology, Uppsala University.
> Husargatan 3, Box 596, 75124 Uppsala, Sweden
> phone: +46 18 471 4537 fax: +46 18 511 755
> erikm at xray.bmc.uu.se http://xray.bmc.uu.se/molbiophys
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