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604758762

铁杆木虫 (正式写手)

[求助] Gromacs水中的溶菌酶npt平衡出错

RT,nvt平衡可以正常运行,但是到npt平衡时,会出错,grompp终止运行
下面是命令及错误信息:
[wanghj@c0103 donglixue]$ grompp_mpi -f npt.mdp -c em.gro -t nvt.cpt -p topol.top -o npt.tpr
                         :-)  G  R  O  M  A  C  S  (-:

                               Grunge ROck MAChoS

                            :-)  VERSION 4.5.5  (-:

        Written by Emile Apol, Rossen Apostolov, Herman J.C. Berendsen,
      Aldert van Buuren, P盲r Bjelkmar, Rudi van Drunen, Anton Feenstra,
        Gerrit Groenhof, Peter Kasson, Per Larsson, Pieter Meulenhoff,
           Teemu Murtola, Szilard Pall, Sander Pronk, Roland Schulz,
                Michael Shirts, Alfons Sijbers, Peter Tieleman,

               Berk Hess, David van der Spoel, and Erik Lindahl.

       Copyright (c) 1991-2000, University of Groningen, The Netherlands.
            Copyright (c) 2001-2010, The GROMACS development team at
        Uppsala University & The Royal Institute of Technology, Sweden.
            check out http://www.gromacs.org for more information.

         This program is free software; you can redistribute it and/or
          modify it under the terms of the GNU General Public License
         as published by the Free Software Foundation; either version 2
             of the License, or (at your option) any later version.

                              :-)  grompp_mpi  (-:

Option     Filename  Type         Description
------------------------------------------------------------
  -f        npt.mdp  Input        grompp input file with MD parameters
-po      mdout.mdp  Output       grompp input file with MD parameters
  -c         em.gro  Input        Structure file: gro g96 pdb tpr etc.
  -r       conf.gro  Input, Opt.  Structure file: gro g96 pdb tpr etc.
-rb       conf.gro  Input, Opt.  Structure file: gro g96 pdb tpr etc.
  -n      index.ndx  Input, Opt.  Index file
  -p      topol.top  Input        Topology file
-pp  processed.top  Output, Opt. Topology file
  -o        npt.tpr  Output       Run input file: tpr tpb tpa
  -t        nvt.cpt  Input, Opt!  Full precision trajectory: trr trj cpt
  -e       ener.edr  Input, Opt.  Energy file

Option       Type   Value   Description
------------------------------------------------------
-[no]h       bool   no      Print help info and quit
-[no]version bool   no      Print version info and quit
-nice        int    0       Set the nicelevel
-[no]v       bool   no      Be loud and noisy
-time        real   -1      Take frame at or first after this time.
-[no]rmvsbds bool   yes     Remove constant bonded interactions with virtual
                            sites
-maxwarn     int    0       Number of allowed warnings during input
                            processing. Not for normal use and may generate
                            unstable systems
-[no]zero    bool   no      Set parameters for bonded interactions without
                            defaults to zero instead of generating an error
-[no]renum   bool   yes     Renumber atomtypes and minimize number of
                            atomtypes

Ignoring obsolete mdp entry 'title'

Back Off! I just backed up mdout.mdp to ./#mdout.mdp.11#
Generated 332520 of the 332520 non-bonded parameter combinations
Generating 1-4 interactions: fudge = 0.5
Generated 332520 of the 332520 1-4 parameter combinations
Excluding 3 bonded neighbours molecule type 'Protein_chain_A'
turning all bonds into constraints...
Excluding 2 bonded neighbours molecule type 'SOL'
turning all bonds into constraints...
Excluding 1 bonded neighbours molecule type 'CL'
turning all bonds into constraints...
Analysing residue names:
There are:   129    Protein residues
There are: 10824      Water residues
There are:     8        Ion residues
Analysing Protein...
Analysing residues not classified as Protein/DNA/RNA/Water and splitting into groups...
Number of degrees of freedom in T-Coupling group Protein is 3895.83
Number of degrees of freedom in T-Coupling group non-Protein is 64965.17

WARNING 1 [file npt.mdp]:
  You are using pressure coupling with absolute position restraints, this
  will give artifacts. Use the refcoord_scaling option.

Reading Coordinates, Velocities and Box size from old trajectory
Will read whole trajectory
Last frame         -1 time    6.300   
Using frame at t = 6.3 ps
Starting time for run is 0 ps
Largest charge group radii for Van der Waals: 0.163, 0.160 nm
Largest charge group radii for Coulomb:       0.172, 0.165 nm
Calculating fourier grid dimensions for X Y Z
Using a fourier grid of 45x45x45, spacing 0.156 0.156 0.156
Estimate for the relative computational load of the PME mesh part: 0.25
This run will generate roughly 399 Mb of data

There was 1 warning

-------------------------------------------------------
Program grompp_mpi, VERSION 4.5.5
Source code file: grompp.c, line: 1584

Fatal error:
Too many warnings (1), grompp_mpi terminated.
If you are sure all warnings are harmless, use the -maxwarn option.
For more information and tips for troubleshooting, please check the GROMACS
website at http://www.gromacs.org/Documentation/Errors
-------------------------------------------------------

"I Caught It In the Face" (P.J. Harvey)

但是在在命令后面加-maxwarn 3 时,即 grompp_mpi -f npt.mdp -c em.gro -t nvt.cpt -p topol.top -o npt.tpr -maxwarn 3就可以正常了,请问这个错误该怎么解决呢?
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zh1987hs

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【答案】应助回帖

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604758762: 金币+3, 有帮助 2012-05-03 21:12:05
You are using pressure coupling with absolute position restraints, this
  will give artifacts. Use the refcoord_scaling option.

这句话是不是提醒了你在mdp文件里加上refcoord_scaling选项?
2楼2012-04-26 10:00:34
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604758762

铁杆木虫 (正式写手)

引用回帖:
2楼: Originally posted by zh1987hs at 2012-04-26 10:00:34:
You are using pressure coupling with absolute position restraints, this
  will give artifacts. Use the refcoord_scaling option.

这句话是不是提醒了你在mdp文件里加上refcoord_scaling选项?

是这样的吗?我看它的命令里面没有这句话哎,如果要加,加在哪个位置呢?
3楼2012-04-26 10:54:29
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andylau286

铁虫 (小有名气)

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感谢参与,应助指数 +1
zh1987hs: 金币+2, 谢谢 2012-04-26 21:15:03
604758762: 金币+3, 有帮助 2012-05-03 21:11:50
WARNING 1 [file npt.mdp]:
  You are using pressure coupling with absolute position restraints, this
  will give artifacts. Use the refcoord_scaling option

这个不算错误,只是系统提示你,你正在用压力耦合,这会给系统带来人工成分,可能会影响到严谨性。
但这个错误是无害的,可以在命令的最后加 “ -maxwarn 1 "就可以运行了,
希望在这个平台学到新东西的同时交到更多好朋友
4楼2012-04-26 21:11:19
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