[gmx-users] VDW Default and PME question

2007-09-19 Thread Jason O'Young

Hi All,

Does anyone know what the default vdw type if none is specified?

Is the value in brackets in the manual the default? If so, there is  
none listed for VWD type.



Additionally, if PME is selected as the coulombtype, do the cutoffs  
matter? I am a bit confused in this regard.


Thanks in advance,
Jason


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[gmx-users] PO4--- Ion Topology

2007-05-30 Thread Jason O'Young

Hi,

Does anyone have or know of a topology for a inorganic phosphate ion?  
(PO4, -3)


Thanks!
Jason

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[gmx-users] Re: gmx-users Digest, Vol 29, Issue 86

2006-09-28 Thread Jason O'Young

Yes that is fine. I don't want to go later than 5 though.

Jason

On 28-Sep-06, at 3:02 PM, [EMAIL PROTECTED] wrote:


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Today's Topics:

   1. energy minimization end too early! (zzhwise1)
   2. QMMM interface ([EMAIL PROTECTED])
   3. Re: energy minimization end too early! (Tsjerk Wassenaar)
   4. Re: Re: water molecules in vacuum simulation (David Mobley)
   5. Job Vacancy -MolNaC University of Salerno (andrea correa)
   6. cardiolipin / Cytochrome C (Viswanadham Sridhara)
   7. defining new residues? ([EMAIL PROTECTED])
   8. Re: defining new residues? (Dongsheng Zhang)


--

Message: 1
Date: Thu, 28 Sep 2006 20:38:56 +0800 (CST)
From: zzhwise1 [EMAIL PROTECTED]
Subject: [gmx-users] energy minimization end too early!
To: gmx-users gmx-users@gromacs.org
Message-ID: [EMAIL PROTECTED]
Content-Type: text/plain; charset=gb2312

hi everyone
today ,I do minimization with my system,my system with two face  
to face monolayers composed of ch3(ch2)13cooh,
when i set the molecular as CHO group,it pass smoothly,because i  
want to pull the upper layer ,so  i set the upper layer group DHO  
that has the same parameters with CHO itp , but the mdrun only  
reached 22th step and finished normally,which is too few to 5000  
steps!

  i want why !
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Message: 2
Date: Thu, 28 Sep 2006 14:01:31 +0100
From: [EMAIL PROTECTED]
Subject: [gmx-users] QMMM interface
To: gmx-users@gromacs.org
Message-ID: [EMAIL PROTECTED]
Content-Type: text/plain;   charset=ISO-8859-1; format=flowed


Dear Gromacs users,

I have been using Pcgamess for QM calculations, which is a very fast
(and free) program, and has some QMMM capabilities(but a size limit of
about 1000 atoms ). I just found out that Gromacs now has QMMM
capabilities with CPMD, Gaussian and Gamess(UK). Does any one know
whether a Gromacs-PcGamess QMMM interface is planned? It would be  
great

for those of us with small research budgets, and who cannot afford the
comercial QM codes.

Pedro


Enviado por https://webmail.ufp.pt




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Message: 3
Date: Thu, 28 Sep 2006 15:08:47 +0200
From: Tsjerk Wassenaar [EMAIL PROTECTED]
Subject: Re: [gmx-users] energy minimization end too early!
To: Discussion list for GROMACS users gmx-users@gromacs.org
Message-ID:
[EMAIL PROTECTED]
Content-Type: text/plain; charset=GB2312; format=flowed

Hi Zzhwise1,

Energy minimization does not need to run all steps. You define a
maximum number, but maybe the minimum is already reached before that.
On the other hand, the energy may have gone to infinity, which usually
puts an end to minimization. Check the energies you get during/after
minimization. Check for overlaps, bad starting structures, bad box,
etc.

Tsjerk

On 9/28/06, zzhwise1 [EMAIL PROTECTED] wrote:

hi everyone
today ,I do minimization with my system,my system with two  
face to face

monolayers composed of ch3(ch2)13cooh,
when i set the molecular as CHO group,it pass smoothly,because i  
want to
pull the upper layer ,so  i set the upper layer group DHO that has  
the same
parameters with CHO itp , but the mdrun only reached 22th step and  
finished

normally,which is too few to 5000 steps!
  i want why !






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 ½á »é Éú Óý ³± ½Ó õà ÖÁ¡¡Ð¡ Ìì ¶ì Ë® ħ ·½ ϲ Ó  »Æ ½ð ÖÜ
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--
Tsjerk A. Wassenaar, Ph.D.
Groningen Biomolecular Sciences and Biotechnology Institute (GBB)
Dept. of Biophysical Chemistry
University of Groningen
Nijenborgh 4
9747AG Groningen, The Netherlands
+31 50 363 4336

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Message: 4
Date: Thu, 28 Sep 2006 08:42:46 -0700
From: David Mobley [EMAIL PROTECTED]
Subject: Re: [gmx-users] Re: water molecules in vacuum simulation
To: Discussion list for GROMACS users gmx-users@gromacs.org
Message-ID:
[EMAIL PROTECTED]
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

This may be naive, but have you defined 

[gmx-users] Beware of your interconnect hardware

2006-05-23 Thread Jason O'Young

Hey All,

Not too long ago I posted about my problems with processes freezing  
(just to refresh, I am running two dual-core nodes for a total of  
four processes).


I managed to remedy the problem by removing the Dell PowerConnect  
2708 Gigabit switch and replacing it with a simple crossover cable.  
Ever since then, the system has been running rock solid.


Are there actually issues with switch hardware with Gromacs? I used  
to think that these things were pretty much fool proof. I spent about  
a month trying to fix what I perceived as a Linux issue.


That poses a question I have to all of you. Is there a particular  
brand or model of switch you recommend? Eventually I would like to  
add another node to the system!


Thanks,
Jason

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[gmx-users] mdrun_mpi stops at random

2006-05-11 Thread Jason O'Young

Hi all,

I have an issue doing parallel runs where the simulation would just  
hang at seemingly random intervals anywhere from an hour to a day.  
There are no error messages reported in the logs and nothing funny  
from dmesg.


My set up is two dual-core Pentium D. I run with -np 4 to take  
advantage of all cores.


When I issue a top command when the run is frozen, I notice that  
mdrun_mpi is at 0% CPU usage and sometimes sleeping on the slave  
node. On the master node, CPU usage is close to max. There is no  
network activity according to the blinking lights on my switch as well.


When I do a run with -np 2 where one process is run on each computer,  
the run seems to carry on stably.


I am using:
Gromacs 3.3.1
Lam 7.1.2
Parallel Knoppix Kernel version 2.6.12

Gromacs was compiled from source.

I understand from searching the archives that a few people have had a  
problem similar to mine, but I could not fine a straight answer.


Thanks!
Jason


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