[gmx-users] more than 100% CPU
Park, Jae Hyun nmn
parkj at ornl.gov
Fri Aug 19 01:36:46 CEST 2011
Thank you, Warren.
Does that mean 16 times faster ?
Jae H. Park
From: gmx-users-bounces at gromacs.org [mailto:gmx-users-bounces at gromacs.org] On Behalf Of Warren Gallin
Sent: Thursday, August 18, 2011 7:26 PM
To: Discussion list for GROMACS users
Subject: Re: [gmx-users] more than 100% CPU
I believe that the current version of GROMACS supports threading, which does not require mpi.
So mdrun is running threads at 100% of the activity of each of your 16 nodes, hence 1600%.
On 2011-08-18, at 5:19 PM, Park, Jae Hyun nmn wrote:
> Hi GMX users,
> I installed GMX 4.5.3 recently.
> But, when I just execute mdrun (without mpi, I did not installed mpi-version of mdrun), the use of CPU appears more than 100% ("top" command in LINUX). How is it possible?
> For example, I am using 16-node machine. And if I simply run "mdrun", then use of CPU is 1600%!!.
> The simulation runs well and the results looks reasonable.
> Is there anybody who can teach me what is happening? I would deeply appreciate.
> Jae H. Park
> Jae Hyun Park, Ph. D.
> Physics Division
> Oak Ridge National Laboratory
> PO. Box 2008, MS-6372
> Oak Ridge, TN 37831
> Phone (865) 241-1482
> E-mail parkj at ornl.gov
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