[gmx-users] low latency

Carsten Kutzner ckutzne at gwdg.de
Wed Jan 14 10:40:00 CET 2009

On Jan 13, 2009, at 9:15 PM, ha salem wrote:

> Dear Karsten and gromacs specialists
> I enabled flow control on hp procurve now I want to know how I can  
> config low latency on the network ?is it required?
> thank you
There are quite some parameters that affect Ethernet performance. They  
be found in the /proc/net/ filesystem, where exactly will depend on  
your type of
system. These settings can also be changed with programs like e.g.  

Did your performance get better with flow control? I would not look at  
the CPU
usage % but perform a benchmark on 1, 2, 4, ... CPUs and compare the  
numbers before and after you make changes. These numbers are far more
reliable because a high CPU usage % does not necessarily mean you have  
scaling. You could also compare the md.log files to find out which  
parts of
mdrun eat up most of the time.


More information about the gromacs.org_gmx-users mailing list