[gmx-users] problem with lamboot

[Carsten Kutzner]

Hi,

if you just want to use both cores on your local machine, then you do
not necessarily need a hostfile. Just type "lamboot" and later specify
the number of cores you want to use with

mpirun -np 2 mdrun ...

BTW, the hostfile you cite below is not the one LAM expects. Use a simple
text editor to create, say "lamhost", and give the name of each machine
with the number of cores, e.g.

mycomputer     cpu=2
remotecomputer cpu=4

This you can use with "lamboot -v lamhost".

Carsten


sarbani chattopadhyay wrote:
>   Hi everybody,
>                       I have question regarding parallel run. I am new
> to this and may sound very
> stupid so please bear with me.
> 
>           Our's is a 10.4.1 Mac Os X with 2 X 2.66 GHz Dual -Core Intel
> Xeon processor.
> Gromacs 3.3.1 was loaded in it. Then I had downloaded the "lam-7.06"
> package from the
> gromacs homepage.
> The host file is present in /private/etc/ directory as expected and reads
> ##
> # Host Database
> #
> # localhost is used to configure the loopback interface
> # when the system is booting.  Do not change this entry.
> ##
> 127.0.0.1      localhost
> 255.255.255.255 broadcasthost
> ::1            localhost
> 
> 
> 
> However  "lamboot" gives error on running on this host file. I want to
> know the correct way
> to modify the host file so that I can launch the "lam/mpi" environment.
> 
> 
> Any suggestion is welcome.
> 
> Thanks in advance
> Sarbani 
> 
> 
> 
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-- 
Dr. Carsten Kutzner
Max Planck Institute for Biophysical Chemistry
Theoretical and Computational Biophysics Department
Am Fassberg 11
37077 Goettingen, Germany
Tel. +49-551-2012313, Fax: +49-551-2012302
www.mpibpc.mpg.de/home/grubmueller/
www.mpibpc.mpg.de/home/grubmueller/ihp/ckutzne/