[gmx-users] Load imbalance

[Carla Jamous]

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.

Carla

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
>> Carla
>>
> 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
>
> --
> gmx-users mailing list    gmx-users at gromacs.org
> http://lists.gromacs.org/mailman/listinfo/gmx-users
> Please search the archive at http://www.gromacs.org/search before posting!
> Please don't post (un)subscribe requests to the list. Use the www interface
> or send it to gmx-users-request at gromacs.org.
> Can't post? Read http://www.gromacs.org/mailing_lists/users.php
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://maillist.sys.kth.se/pipermail/gromacs.org_gmx-users/attachments/20100122/5078cb57/attachment.html>