I am simulating a protein-ligand system, using oplss force field but i got 
this error during minimization.
Steepest Descents:
   Tolerance (Fmax)   =  1.00000e+03
   Number of steps    =        50000
Step=    0, Dmax= 1.0e-02 nm, Epot=  1.27151e+33 Fmax= 4.76291e+07, atom= 1996
Segmentation fault (core dumped)

and this is my mpd file:; LINES STARTING WITH ';' ARE COMMENTS
title               = Minimization      ; Title of run

; Parameters describing what to do, when to stop and what to save
integrator          = steep             ; Algorithm (steep = steepest descent 
emtol               = 1000.0    ; Stop minimization when the maximum force < 
10.0 kJ/mol
emstep          = 0.01      ; Energy step size
nsteps              = 50000             ; Maximum number of (minimization) 
steps to perform

; Parameters describing how to find the neighbors of each atom and how to 
calculate the interactions
nstlist             = 1                 ; Frequency to update the neighbor list 
and long range forces
cutoff-scheme   = Verlet
ns_type             = grid                  ; Method to determine neighbor list 
(simple, grid)
rlist               = 1.2                   ; Cut-off for making neighbor list 
(short range forces)
coulombtype         = PME                   ; Treatment of long range 
electrostatic interactions
rcoulomb            = 1.2                   ; long range electrostatic cut-off
vdwtype         = cutoff
vdw-modifier    = force-switch
rvdw-switch     = 1.0
rvdw                = 1.2                   ; long range Van der Waals cut-off
pbc             = xyz               ; Periodic Boundary Conditions
DispCorr        = no
Can anyone suggest how to troubleshoot this error? 
The system is nuetralized. Thank you in advance.

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