Hello,
thank you for your reply. I have used following command :

g_msd  -n POPC.ndx  -lateral z -o POPC_msd.xvg -mol POPC_diff.xvg 

Trajectory has 10000 frames and the system it was ran on is Fedora Red Hat 5.4.
Indeed my network administrator was very unhappy about comsumed memory.

Regards,
   Slawomir





Wiadomość napisana przez Tsjerk Wassenaar w dniu 2011-06-27, o godz. 15:40:

> Hi Slawomir,
> 
> That's quite a usage of memory! Can you provide more information? Like
> the number of frames in the trajectory, the command line you used, and
> the system you ran on?
> 
> Cheers,
> 
> Tsjerk
> 
> 2011/6/27 Sławomir Stachura <stachura.slawo...@gmail.com>:
>> Hi GMX Users,
>> I am writting this email, beacause I think the g_msd program in Gromacs 
>> 4.5.4 bears a problem. I was calculating the MSD od center of mass of POPC 
>> in membrane (system contains 274 POPC lipid molecules in all-atom force 
>> field) from 50 ns trajectory and it seems to consume great amount of memory. 
>> With  time of calculations the memory reserves are gradually devoured to the 
>> extent, in my case,  of over 600 GB (than my administrator of cluster killed 
>> the process). It seems that it does not release memory and it's pilling 
>> results up with steps  in memory. Have you heard of such case?
>> Best wishes,
>>   Slawomir--
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> 
> 
> 
> -- 
> Tsjerk A. Wassenaar, Ph.D.
> 
> post-doctoral researcher
> Molecular Dynamics Group
> * Groningen Institute for Biomolecular Research and Biotechnology
> * Zernike Institute for Advanced Materials
> University of Groningen
> The Netherlands
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