<div dir="ltr">I don't know how large the system is. I'm the cluster's system administrator and don't understand much of what's going on. The test was given to me by a person who works with it. I can ask him or look at it, if you can point me how to do it.<br>
<br>Thanks, I will look at some of his posts.<br><br>Best regards,<br><br> Tiago Marques<br><br><br>On Tue, Sep 23, 2008 at 4:03 PM, Jochen Hub <<a href="mailto:jhub@gwdg.de">jhub@gwdg.de</a>> wrote:<br>
Tiago Marques wrote:<br>> Hi!<br>><br>> I've been using Gromacs on dual-socket quad-core Xeons with 8GiB of RAM,<br>> connected with Gigabit Ethernet and I always seem to have problems scaling<br>> to more than a node.<br>
><br>> When I run a test on 16 cores, it does run but the result is often slower<br>> than when running on only 8 cores on the same machine. The best result I've<br>> managed is not being slower than 8 cores on 16.<br>
><br>> What am I missing here, or are the tests inappropriate to run over more than<br>> one machine?<br><br>How large is your system? Which gromacs version are you using?<br><br>And have a look at the messages by Carsten Kutzner in this list, he<br>
wrote a lot on gromacs scaling.<br><br>Jochen<br><br>><br>> Best regards,<br>><br>> Tiago Marques<br>><br>><br>><br>> ------------------------------------------------------------------------<br>
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Max Planck Institute for Biophysical Chemistry<br>Computational biomolecular dynamics group<br>Am Fassberg 11<br>D-37077 Goettingen, Germany<br>Email: jhub[at]<a href="http://gwdg.de">gwdg.de</a><br>Tel.: +49 (0)551 201-2312<br>
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