[gmx-users] regarding charge group

2013-10-22 Thread Sathish Kumar
The sum of the two largest charge group radii (13.336) is larger
than rlist(1.2) - rvdw/rcoulomb i am getting this error while running
membrane simulations. please any one suggest how to rectify this error.
-- 
regards
M.SathishKumar
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Re: [gmx-users] regarding charge group

2013-10-22 Thread Mark Abraham
Probably, make your broken molecules whole before passing them to grompp.

Mark


On Tue, Oct 22, 2013 at 8:26 AM, Sathish Kumar sathishk...@gmail.comwrote:

 The sum of the two largest charge group radii (13.336) is larger
 than rlist(1.2) - rvdw/rcoulomb i am getting this error while running
 membrane simulations. please any one suggest how to rectify this error.
 --
 regards
 M.SathishKumar
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[gmx-users] Minimum distance between periodic images

2013-10-22 Thread Nidhi Katyal
Dear all users

I have simulated a protein with two chains (153 residues each) for
50ns(restarting crashed run 3 times) using a cubic box with each side as
11nm. After finding the closest distance between the periodic images, I
found that the closest distance  becomes lesser than 1 after 23ns for few
ns and then again  shoots up (and fluctuates around the previous value) and
then again becomes lesser than 1 around 49ns.The command which I used:
g_mindist -f md-run-1-noPBC.xtc -s md-run-1.tpr -n index.ndx -od mindist.xvg
-pi

Similar trend is seen when I plotted rmsd curve and distance between the
two chains or any other analysis curve (ie at those specific time intervals
in between, the value shoots up)

My question is : Will it be reasonable enough to carry out my analysis for
first 22ns and discard the rest? Is this the problem due to smaller box
size or some other parameter as the previous studies (through literature
survey) have used even much lesser box length (although their simulations
were also of short duration than 50ns).

I have posted the output of minimum distance between periodic images at :
https://plus.google.com/photos/109332801667278171972/albums/5937501788329595121?authkey=CJHD-9XO7dH4jgE
and rmsd wrt c alpha at :

https://plus.google.com/photos/109332801667278171972/albums/5937501062407227393?authkey=CKOE9sP5pMO2NA

Please help me figure out the problem.
Thanks in advance.
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Re: [gmx-users] Minimum distance between periodic images

2013-10-22 Thread Tsjerk Wassenaar
Hi Nidhi,

These are periodicity artifacts. Make sure that you remove jumps over PBC
from your trajectory by using trjconv -pbc nojump.

Cheers,

Tsjerk


On Tue, Oct 22, 2013 at 11:14 AM, Nidhi Katyal nidhikatyal1...@gmail.comwrote:

 Dear all users

 I have simulated a protein with two chains (153 residues each) for
 50ns(restarting crashed run 3 times) using a cubic box with each side as
 11nm. After finding the closest distance between the periodic images, I
 found that the closest distance  becomes lesser than 1 after 23ns for few
 ns and then again  shoots up (and fluctuates around the previous value) and
 then again becomes lesser than 1 around 49ns.The command which I used:
 g_mindist -f md-run-1-noPBC.xtc -s md-run-1.tpr -n index.ndx -od
 mindist.xvg
 -pi

 Similar trend is seen when I plotted rmsd curve and distance between the
 two chains or any other analysis curve (ie at those specific time intervals
 in between, the value shoots up)

 My question is : Will it be reasonable enough to carry out my analysis for
 first 22ns and discard the rest? Is this the problem due to smaller box
 size or some other parameter as the previous studies (through literature
 survey) have used even much lesser box length (although their simulations
 were also of short duration than 50ns).

 I have posted the output of minimum distance between periodic images at :

 https://plus.google.com/photos/109332801667278171972/albums/5937501788329595121?authkey=CJHD-9XO7dH4jgE
 and rmsd wrt c alpha at :


 https://plus.google.com/photos/109332801667278171972/albums/5937501062407227393?authkey=CKOE9sP5pMO2NA

 Please help me figure out the problem.
 Thanks in advance.
 --
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[gmx-users] Regarding membrane(DMPC) simulations with fullerene

2013-10-22 Thread Sathish Kumar
Dear Sir,


  I am doing fullerene interaction with DMPC , i downloaded
the gro file from the website  mentioned in the tutorial. I was keep the
fullerene on the top of DMPC. But in the gro file already water is present.
If i removed that water molecules and adding new water molecules by using
genbox command and afetr the running energy minimization the lipid
structure was collapsed. it is not like initial structure and some gaps
were found in the middle of membrane.
   By keeping the water molecules as such
from the gro file and i keep the fullerene above the membrane then the
presented water molecules were randomly distributed inside the membrane,
and structure of water was distrubed.

If i added water using genbox to the membrane( with water from gro file),
there is a seperation found between two water layers.

Energy minimization was not running in all above cases.

 How can i run this simulation please suggest  me

Is there any tutorial like this simulation.

Thank You.

-- 
regards
M.SathishKumar
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Re: [gmx-users] Minimum distance between periodic images

2013-10-22 Thread Nidhi Katyal
Thank you sir.


On Tue, Oct 22, 2013 at 2:48 PM, Tsjerk Wassenaar tsje...@gmail.com wrote:

 Hi Nidhi,

 These are periodicity artifacts. Make sure that you remove jumps over PBC
 from your trajectory by using trjconv -pbc nojump.

 Cheers,

 Tsjerk


 On Tue, Oct 22, 2013 at 11:14 AM, Nidhi Katyal nidhikatyal1...@gmail.com
 wrote:

  Dear all users
 
  I have simulated a protein with two chains (153 residues each) for
  50ns(restarting crashed run 3 times) using a cubic box with each side as
  11nm. After finding the closest distance between the periodic images, I
  found that the closest distance  becomes lesser than 1 after 23ns for few
  ns and then again  shoots up (and fluctuates around the previous value)
 and
  then again becomes lesser than 1 around 49ns.The command which I used:
  g_mindist -f md-run-1-noPBC.xtc -s md-run-1.tpr -n index.ndx -od
  mindist.xvg
  -pi
 
  Similar trend is seen when I plotted rmsd curve and distance between the
  two chains or any other analysis curve (ie at those specific time
 intervals
  in between, the value shoots up)
 
  My question is : Will it be reasonable enough to carry out my analysis
 for
  first 22ns and discard the rest? Is this the problem due to smaller box
  size or some other parameter as the previous studies (through literature
  survey) have used even much lesser box length (although their simulations
  were also of short duration than 50ns).
 
  I have posted the output of minimum distance between periodic images at :
 
 
 https://plus.google.com/photos/109332801667278171972/albums/5937501788329595121?authkey=CJHD-9XO7dH4jgE
  and rmsd wrt c alpha at :
 
 
 
 https://plus.google.com/photos/109332801667278171972/albums/5937501062407227393?authkey=CKOE9sP5pMO2NA
 
  Please help me figure out the problem.
  Thanks in advance.
  --
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  http://lists.gromacs.org/mailman/listinfo/gmx-users
  * Please search the archive at
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 --
 Tsjerk A. Wassenaar, Ph.D.
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[gmx-users] a new GROMACS simulation tool

2013-10-22 Thread Kevin Chen
Hi Everyone,

I'm writing to let you guys know that we have developed a web-based tool MD
simulation tool for GROMACS.  It is a software package primarily developed
for biological MD and offers a huge amount of possible options and settings
for tailoring the simulations. Seamlessly integrated with newly developed
GUI interfaces, the tool provides comprehensive setup, simulation, analysis
and job submission tools. Most importantly, unlike other GROMACS GUI
applications, user can actually run really simulations using the dedicated
HPC resources. That been said, there's no proposal and installation
required.  This tool could be a great fit for both teaching and research
projects. Users inexperienced in MD can work along prepared workflows, while
experts may enjoy a significant relief from the tedium of typing and
scripting. As for now, we'd like to invite people to participate in user
testing on this newly developed tool. Let me know if you'd like to try it
out. We will set up an account for you.  

Best Regards,

Kevin Chen, Ph.D.
Information Technology at Purdue (ITaP)
West Lafayette, IN 47907-2108

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Re: [gmx-users] a new GROMACS simulation tool

2013-10-22 Thread Michael Shirts
Is there a link to the documentation?  It's a little difficult to know
exactly what this supposed to be doing.  Is it a GUI interface to
gromacs?

In general, it would be great to get these sort of extensions
coordinated with the main gromacs development tree, since otherwise
they would tend to get out of sync, lowering utility to everyone.

On Tue, Oct 22, 2013 at 10:34 AM, Kevin Chen fch6...@gmail.com wrote:
 Hi Everyone,

 I'm writing to let you guys know that we have developed a web-based tool MD
 simulation tool for GROMACS.  It is a software package primarily developed
 for biological MD and offers a huge amount of possible options and settings
 for tailoring the simulations. Seamlessly integrated with newly developed
 GUI interfaces, the tool provides comprehensive setup, simulation, analysis
 and job submission tools. Most importantly, unlike other GROMACS GUI
 applications, user can actually run really simulations using the dedicated
 HPC resources. That been said, there's no proposal and installation
 required.  This tool could be a great fit for both teaching and research
 projects. Users inexperienced in MD can work along prepared workflows, while
 experts may enjoy a significant relief from the tedium of typing and
 scripting. As for now, we'd like to invite people to participate in user
 testing on this newly developed tool. Let me know if you'd like to try it
 out. We will set up an account for you.

 Best Regards,

 Kevin Chen, Ph.D.
 Information Technology at Purdue (ITaP)
 West Lafayette, IN 47907-2108

 --
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[gmx-users] Problems about the output force

2013-10-22 Thread Qianqian Cao
Dear all,

I have some doubt for the output force. What contributions do the output
forces in .trr file include? Certainly, the pair forces and bonded
interactions are included. However, if the external field (such as electric
field) is applied, is the external force included? In addition, if the
constraint (such as LINCS or SHAKE constraints) is used, is it also
included in the output force? If so, how is the constraint contribution
calculated?

Best,
Qianqian
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RE: [gmx-users] a new GROMACS simulation tool

2013-10-22 Thread Kevin Chen
Hi Michael,

Sorry, if this is not the right place to post message of such. To answer
your question, it is a web-based GUI interface to GROMACS, which is a
perfect fit for those who are trying to learn MD or to run large scale
protein simulations on HPC.

Best Regards,


KevinFeng Chen, Ph.D.
XSEDE Campus Champion, XSEDE Extended Collaborative Support (ECSS)
Consultant 
and Research Programmer  
Rosen Center for Advanced Computing
Information Technology at Purdue (ITaP)
Young Hall,RM 952
155 South Grant Street
West Lafayette, IN 47907-2108
off: (765) 496-9614
fax: (765) 496-4295

 

-Original Message-
From: gmx-users-boun...@gromacs.org [mailto:gmx-users-boun...@gromacs.org]
On Behalf Of Michael Shirts
Sent: Tuesday, October 22, 2013 1:18 PM
To: Discussion list for GROMACS users
Subject: Re: [gmx-users] a new GROMACS simulation tool

Is there a link to the documentation?  It's a little difficult to know
exactly what this supposed to be doing.  Is it a GUI interface to gromacs?

In general, it would be great to get these sort of extensions coordinated
with the main gromacs development tree, since otherwise they would tend to
get out of sync, lowering utility to everyone.

On Tue, Oct 22, 2013 at 10:34 AM, Kevin Chen fch6...@gmail.com wrote:
 Hi Everyone,

 I'm writing to let you guys know that we have developed a web-based 
 tool MD simulation tool for GROMACS.  It is a software package 
 primarily developed for biological MD and offers a huge amount of 
 possible options and settings for tailoring the simulations. 
 Seamlessly integrated with newly developed GUI interfaces, the tool 
 provides comprehensive setup, simulation, analysis and job submission 
 tools. Most importantly, unlike other GROMACS GUI applications, user 
 can actually run really simulations using the dedicated HPC resources. 
 That been said, there's no proposal and installation required.  This 
 tool could be a great fit for both teaching and research projects. 
 Users inexperienced in MD can work along prepared workflows, while 
 experts may enjoy a significant relief from the tedium of typing and 
 scripting. As for now, we'd like to invite people to participate in 
 user testing on this newly developed tool. Let me know if you'd like to
try it out. We will set up an account for you.

 Best Regards,

 Kevin Chen, Ph.D.
 Information Technology at Purdue (ITaP) West Lafayette, IN 47907-2108

 --
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Re: [gmx-users] Regarding membrane(DMPC) simulations with fullerene

2013-10-22 Thread Justin Lemkul



On 10/22/13 9:15 AM, Sathish Kumar wrote:

Dear Sir,


   I am doing fullerene interaction with DMPC , i downloaded
the gro file from the website  mentioned in the tutorial. I was keep the
fullerene on the top of DMPC. But in the gro file already water is present.
If i removed that water molecules and adding new water molecules by using
genbox command and afetr the running energy minimization the lipid
structure was collapsed. it is not like initial structure and some gaps
were found in the middle of membrane.
By keeping the water molecules as such
from the gro file and i keep the fullerene above the membrane then the
presented water molecules were randomly distributed inside the membrane,
and structure of water was distrubed.

If i added water using genbox to the membrane( with water from gro file),
there is a seperation found between two water layers.



All of the above outcomes simply suggest that you're not building the system in 
a sensible manner.  Without exact commands and some images of what you're 
getting, there's nothing that anyone can really do to help.



Energy minimization was not running in all above cases.

  How can i run this simulation please suggest  me

Is there any tutorial like this simulation.



If it's not linked on the Gromacs website and Google can't find it, then no. 
Tutorials don't exist for every iteration of a task.  You want to place a 
molecule at some location relative to a membrane; that's not significantly 
different from the simple concepts described here:


http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin/gmx-tutorials/biphasic/03_tricks.html

-Justin

--
==

Justin A. Lemkul, Ph.D.
Postdoctoral Fellow

Department of Pharmaceutical Sciences
School of Pharmacy
Health Sciences Facility II, Room 601
University of Maryland, Baltimore
20 Penn St.
Baltimore, MD 21201

jalem...@outerbanks.umaryland.edu | (410) 706-7441

==
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[gmx-users] Conflicting atom names when using g_density

2013-10-22 Thread Bin Liu
Hi Everyone,

I am having an awkward situation. I want to use g_density to get the
density profile of a lipid bilayer. At first glance, it looks like a
trivial task. But for my case, it's not because I have conflicting atom
names from two different molecules. I am using GROMOS 53a6. In DPPC
topology, I have C1 C2 C3 N4...O7...
In another lipid topology, say lipid B, I have C1 C2 C3 N4... C7...

The C1 in DPPC and C1 in lipid B could have different atomic mass as GROMOS
is united atom representation. C1 of DPPC could be a CH2, C2 of lipid B
could be a CH3. Then I don't know how to specify the entry in the .dat file:

C1 = ?

Is it possible to calculate the density profile of the whole bilayer by
just invoking g_density once? Or in my awkward situation, I have to
calculate the density profile of each molecule type, then add them
together? Then I will be concerned with the numerical errors involved.

Thanks.

Bin
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Re: [gmx-users] Conflicting atom names when using g_density

2013-10-22 Thread Justin Lemkul



On 10/22/13 9:05 PM, Bin Liu wrote:

Hi Everyone,

I am having an awkward situation. I want to use g_density to get the
density profile of a lipid bilayer. At first glance, it looks like a
trivial task. But for my case, it's not because I have conflicting atom
names from two different molecules. I am using GROMOS 53a6. In DPPC
topology, I have C1 C2 C3 N4...O7...
In another lipid topology, say lipid B, I have C1 C2 C3 N4... C7...

The C1 in DPPC and C1 in lipid B could have different atomic mass as GROMOS
is united atom representation. C1 of DPPC could be a CH2, C2 of lipid B
could be a CH3. Then I don't know how to specify the entry in the .dat file:

C1 = ?

Is it possible to calculate the density profile of the whole bilayer by
just invoking g_density once? Or in my awkward situation, I have to
calculate the density profile of each molecule type, then add them
together? Then I will be concerned with the numerical errors involved.



Assign unique names in the .top, create a new .tpr, and the problem is solved.

-Justin

--
==

Justin A. Lemkul, Ph.D.
Postdoctoral Fellow

Department of Pharmaceutical Sciences
School of Pharmacy
Health Sciences Facility II, Room 601
University of Maryland, Baltimore
20 Penn St.
Baltimore, MD 21201

jalem...@outerbanks.umaryland.edu | (410) 706-7441

==
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Re: [gmx-users] Re: [gmx-developers] v4.6.3: cmake-stage error at CMakeLists.txt:102

2013-10-22 Thread Nikolay Alemasov

Hi!

It is strange but such combination works:

CC=icc CXX=icpc ~/cmake-2.8.12/bin/cmake .. 
-DCMAKE_INSTALL_PREFIX=/ifs/apps/GROMACS-4.6.3 -DGMX_X11=OFF 
-DGMX_MPI=ON -DGMX_FFT_LIBRARY=mkl -DGMX_GPU=ON cmake.log


It was a command that our cluster administrator was able to configure 
GROMACS with. So the problem has been solved.


16.10.2013 18:17, Mark Abraham пишет:

On Wed, Oct 16, 2013 at 12:27 PM, Nikolay Alemasov suc...@gmail.com wrote:


Thank you, Mark!

 It was already tried. I mean a fresh unpacking and further cmake run.
As for your first thought concerning a loss of access to some parts of
gmxlib:


[alemasov@nks-g6 gromacs-4.6.3]$ ls -l ./src/gmxlib/ | grep -e - | cut
-d' ' -f 1 | sort -n | uniq
drwxr-x---
-rw-r-


 So there are only two permissions patterns which allow me to
read/write items in the directory. I am little bit confused. Are there any
limitations about OS or cmake versions? The latter is cmake version
2.8.12.


Also relevant are the owners, if you have unpacked as root and built as
normal user, or vice-versa, etc. You should be doing nothing with root
until you need to install, of course, and since you are installing to user
space, you definitely should not be root.

CMake has not yet updated their compatibility matrix for 2.8.12 (
http://www.cmake.org/Wiki/CMake_Version_Compatibility_Matrix/Commands) and
as you can see there, things that used to work occasionally stop working.
If you can try a different version of CMake we can rule out bugs in CMake
2.8.12.

Mark



  (Redirected from gmx-developers)

The only way I can reproduce those symptoms is if I delete (or otherwise
make unreadable) various parts of src/gmxlib. You may have deleted some
files or been a different user at some point. I suggest you do a fresh
unpack of the tarball and try again.

Mark


On Wed, Oct 16, 2013 at 7:19 AM, Nikolay Alemasov such3r at gmail.com  
http://lists.gromacs.org/**mailman/listinfo/gmx-usershttp://lists.gromacs.org/mailman/listinfo/gmx-users
wrote:


/  Greetings,

//
//  I am trying to compile the source code v.4.6.3 with cmake. The
shell
//  script is (ran from the build directory inside gromacs source root
dir):
//
//   CC=/ifs/opt/2013/intel/bin/icc
//  CXX=/ifs/opt/2013/intel/bin/icpc
//  CMAKE_PREFIX_PATH=/ifs/home/bionet/alemasov/libraries/
fftw
//
//  cmake .. \
//  -DGMX_GPU=OFF \
//  -DGMX_CPU_ACCELERATION=SSE2 \
//  -DFFTWF_LIBRARY='/ifs/home/bionet/alemasov/libraries/
fftw/lib/libfftw3f.so'
//  \
//  -DFFTWF_INCLUDE_DIR='/ifs/home/bionet/alemasov/
libraries/fftw/include'
//  \
//  -DCMAKE_INSTALL_PREFIX='/ifs/home/bionet/alemasov/
libraries/gromacs'
//
//
//  And get a message (successful part was cut):
//  ...
//
//  -- Performing Test HAVE_DLOPEN
//  -- Performing Test HAVE_DLOPEN - Success
//  -- Checking for dlopen - found
//  -- Found the ability to use plug-ins when building shared libaries,
so
//  will compile to use plug-ins (e.g. to read VMD-supported file
formats).
//  -- Checking for suitable VMD version
//  -- VMD plugins not found. Path to VMD can be set with VMDDIR.
//  CMake Error at src/gmxlib/CMakeLists.txt:102 (list):
//list sub-command REMOVE_ITEM requires two or more arguments.
//
//
//  CMake Error at src/gmxlib/CMakeLists.txt:105 (list):
//list sub-command REMOVE_ITEM requires two or more arguments.
//
//
//  You have called ADD_LIBRARY for library md without any source
files. This
//  typically indicates a problem with your CMakeLists.txt file
//  -- Configuring incomplete, errors occurred!
//  See also /ifs/home/bionet/alemasov/
libraries/gromacs-4.6.3/build/
//  CMakeFiles/CMakeOutput.log.
//  See also /ifs/home/bionet/alemasov/
libraries/gromacs-4.6.3/build/
//  CMakeFiles/CMakeError.log.
//
//
//  Below is a content of the src/gmxlib/CMakeLists.txt:99-105:
//
//  99 : # Files called xxx_test.c are test drivers with a main()
function
//  for module xxx.c,
//  100: # so they should not be included in the library
//  101: file(GLOB_RECURSE NOT_GMXLIB_SOURCES *_test.c *\#*)
//  102: list(REMOVE_ITEM GMXLIB_SOURCES ${NOT_GMXLIB_SOURCES})
//  103: # Selection has test_ instead of _test.
//  104: file(GLOB SELECTION_TEST selection/test*)
//  105: list(REMOVE_ITEM GMXLIB_SOURCES ${SELECTION_TEST})
//
//
//  The target system:
//
//   Linux nks-g6.sscc.ru 2.6.18-164.el5 #1 SMP Tue Aug 18 15:51:48 EDT
2009
//  x86_64 x86_64 x86_64 GNU/Linux
//  Red Hat Enterprise Linux Server release 5.4 (Tikanga)
//  model name: Intel(R) Xeon(R) CPU   X5560  @ 2.80GHz
//
//
//  Please help me to sort out the issue. In fact my primary aim was to
build
//  GPU-version of the GROMACS, but I can not do it even for the simplest
//  variant.
//  --
//  gmx-developers mailing list
//  gmx-developers at gromacs.org  http://lists.gromacs.org/**
mailman/listinfo/gmx-usershttp://lists.gromacs.org/mailman/listinfo/gmx-users
//  

[gmx-users] Energy minimizations taking really, really long?

2013-10-22 Thread Nimmy McNimmerson
I have some simulations of inserting a probe molecule into a bilayer. Some 
molecules work fine. However, a certain class of molecules is taking an 
absurdly long time to run the exact same simulation, even though I energy 
minimized the molecules individually beforehand and there are no overlaps. What 
might be going wrong?

Thanks.
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[gmx-users] Box size increases in NPT

2013-10-22 Thread Nilesh Dhumal
Hello,

I am running a NPT simulation for cyclopropylchloride(1) in
50%water(100)+50%ethanol(100) using opls force field parameter .

After equilibration box size increases from 20 A to 70 A.

I used the following mdp file.

; RUN CONTROL PARAMETERS =
integrator   = sd
; start time and timestep in ps =
tinit= 0
dt   = 0.001
nsteps   = 5
; number of steps for center of mass motion removal =
nstcomm  = 100
; OUTPUT CONTROL OPTIONS =
; Output frequency for coords (x), velocities (v) and forces (f) =
nstxout  = 0
nstvout  = 0
nstfout  = 0
; Output frequency for energies to log file and energy file =
nstlog   = 500
nstenergy= 100
; Output frequency and precision for xtc file =
nstxtcout= 5000
xtc-precision= 1000
; NEIGHBORSEARCHING PARAMETERS =
; nblist update frequency =
nstlist  = 10
; ns algorithm (simple or grid) =
ns_type  = grid
;OPTIONS FOR TEMPERATURE COUPLING
tc_grps  = system
tau_t= 0.1
ref_t= 290;350
;OPTIONS FOR PRESSURE COUPLING
Pcoupl   = berendsen
tau_p= 0.5
compressibility  = 4.5e-05
ref_p= 1.0
; OPTIONS FOR BONDS =
constraints  = hbonds
; Type of constraint algorithm =
constraint-algorithm = Lincs
; Do not constrain the start configuration =
unconstrained-start  = no
; Relative tolerance of shake =
shake-tol= 0.0001
; Highest order in the expansion of the constraint coupling matrix =
lincs-order  = 12
; Lincs will write a warning to the stderr if in one step a bond =
; rotates over more degrees than =
lincs-warnangle  = 30

; Periodic boundary conditions: xyz or none =
pbc  = xyz
; nblist cut-off =
rlist= 0.9
domain-decomposition = no
; OPTIONS FOR ELECTROSTATICS AND VDW =
; Method for doing electrostatics =
coulombtype  = pme
;rcoulomb-switch  = 0
rcoulomb = 0.9
; Dielectric constant (DC) for cut-off or DC of reaction field =
epsilon-r= 1
; Method for doing Van der Waals =
vdw-type = switch
; cut-off lengths=
rvdw-switch  = 0.8
rvdw = 0.9
; Apply long range dispersion corrections for Energy and Pressure =
DispCorr  = EnerPres
; Spacing for the PME/PPPM FFT grid =
fourierspacing   = 0.1
; FFT grid size, when a value is 0 fourierspacing will be used =
fourier_nx   = 0
fourier_ny   = 0
fourier_nz   = 0
; EWALD/PME/PPPM parameters =
pme_order= 6
ewald_rtol   = 1e-06
epsilon_surface  = 0
optimize_fft = no
; Free energy control stuff
free_energy  = no


Nilesh



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[gmx-users] Re: Energy minimizations taking really, really long?

2013-10-22 Thread shika
It depending the time steps that u used or the molecule that u had is
big..Thats why ur EM take a long time..Is better take a long time
rather than quick but had a lot of errors..

On Wed, Oct 23, 2013 at 9:59 AM, Nimmy McNimmerson [via GROMACS]
ml-node+s5086n5011918...@n6.nabble.com wrote:
 I have some simulations of inserting a probe molecule into a bilayer. Some
 molecules work fine. However, a certain class of molecules is taking an
 absurdly long time to run the exact same simulation, even though I energy
 minimized the molecules individually beforehand and there are no overlaps.
 What might be going wrong?

 Thanks.
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-- 
Best Regards,

Nur Syafiqah Abdul Ghani,
Theoretical and Computational Chemistry Laboratory,
Department of Chemistry,
Faculty of Science,
Universiti Putra Malaysia,
43400 Serdang,
Selangor.
alternative email : syafiqahabdulgh...@gmail.com @ gs33...@mutiara.upm.edu.my


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[gmx-users] Continuing runs from 4.5.4 in 4.6.3

2013-10-22 Thread rajat desikan
Hi,

We recently had a software upgrade in our cluster from gromacs 4.5.4. to
gromacs 4.6.3.. I need to continue an earlier simulation that had been run
in 4.5.4. using the .cpt, .tpr and .mdp.

Are there any issues with continuing these runs in 4.6.3.? Can I
concatenate these trajectories for later analysis?

I notice that I cannot use a 4.6.3 .cpt and .tpr in 4.5.4.

Any input will be appreciated. Thanks.

-- 
Rajat Desikan (Ph.D Scholar)
Prof. K. Ganapathy Ayappa's Lab (no 13),
Dept. of Chemical Engineering,
Indian Institute of Science, Bangalore
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