-np is not about number of processors in the case of genion. It's the number of positive ions to insert.

shaya...@post.tau.ac.il skrev:
Hi,
No need to include "-np 4" at all. genion command does not take advantage of multiple processors (nor does it need to).

Try rerunning the command without -np 4.

-Shay

Quoting "priyanka panwar" <priyankapanwa...@gmail.com>:

Command line was " genion -s em.tpr -o ions.pdb -np 4"

On Mon, May 3, 2010 at 5:19 PM, Justin A. Lemkul <jalem...@vt.edu> wrote:



priyanka panwar wrote:

Hi,
Thanks for help.
-Command line was:
Number of (3-Atomic) solvent molecules:4256
Replacing solvent molecule 499 (atom 2784) with Na


That's not a command line. What command did you actually type (exactly) to
run genion?


 -Group selected was: 12 (SOL)
-Gromacs version I am using is 3.3.1


In the absence of any compelling reason (i.e., consistency with previous
simulations), using a Gromacs version that is four years old is not
recommended. The new 4.0.x series is substantially faster and has many new
features.

-Justin

 On Mon, May 3, 2010 at 4:31 PM, Krzysztof Mlynarczyk <
mitomas...@gmail.com <mailto:mitomas...@gmail.com>> wrote:

   Please post more details including the following:

       * What is the exact command line?
       * What group do you select as a "continuous solvent"? I know it
         might sound weird to ask this but what I learned while
         teaching students is that these questions really should be
         asked when there are problems.
       * Which version of Gromacs are you using?


   2010/5/3 priyanka panwar <priyankapanwa...@gmail.com
   <mailto:priyankapanwa...@gmail.com>>


       I am  using Gromacs for Simulation of Insulin.I have generated
       most of the files but unable to generate the ions.pdb file.The
       system is becoming idle after the Selection command. A line on
       the command prompt appears as "replacing solvent molecule with
       Na" and remains as such for many hours. Is this step really
takes too much time or I am doing something wrong. Thanks
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--
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Justin A. Lemkul
Ph.D. Candidate
ICTAS Doctoral Scholar
MILES-IGERT Trainee
Department of Biochemistry
Virginia Tech
Blacksburg, VA
jalemkul[at]vt.edu | (540) 231-9080
http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin

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