Hi there,

I am using gromacs-4.6.1 with this mdp file:

integrator      = md            ; leap-frog integrator
nsteps          = 3000000       ; 6.0 ns
dt              = 0.002         ; 2 fs
nstxout         = 0             ; save coordinates every 10 ps
nstvout         = 0             ; save velocities every 10 ps
nstenergy       = 5000          ; save energies every 10 ps
nstlog          = 5000          ; update log file every 5 ps
nstcalcenergy   = 100          ; 
nstxtcout   = 5000      ; xtc every 10 ps
xtc_precision = 100
continuation    = yes           ; Restarting  
constraint_algorithm = lincs    ; holonomic constraints 
constraints     = all-bonds     ; all bonds (even heavy atom-H bonds) 
constrained
lincs_iter      = 1             ; accuracy of LINCS
lincs_order     = 4             ; also related to accuracy
ns_type         = grid          ; search neighboring grid cells
nstlist         = 20            ; 10 fs
rlist           = 1.0           ; short-range neighborlist cutoff (in nm)
rcoulomb        = 1.0           ; short-range electrostatic cutoff (in nm)
rvdw            = 1.0           ; short-range van der Waals cutoff (in nm)
nstcalclr        = 10
cutoff-scheme   = Group
vdwtype         = Cut-off
vdw-modifier         = Potential-shift 
coulombtype     = PME           ; Particle Mesh Ewald for long-range 
electrostatics
pme_order       = 4             ; cubic interpolation
fourierspacing  = 0.16          ; grid spacing for FFT
coulomb-modifier = Potential-shift 
tcoupl          = V-rescale     ; modified Berendsen thermostat
tc-grps         = System        ; two coupling groups - more accurate
tau_t           = 0.1           ; time constant, in ps
ref_t           = 300           ; reference temperature, one for each group, in 
K
energygrps      = complex Water        ; group(s) to write to energy file
pcoupl          = Parrinello-Rahman     ; Pressure coupling on in NPT
pcoupltype      = isotropic     ; uniform scaling of box vectors
tau_p           = 2.0           ; time constant, in ps
ref_p           = 1.0           ; reference pressure, in bar
compressibility = 4.5e-5        ; isothermal compressibility of water, bar^-1
refcoord_scaling = com
pbc             = xyz           ; 3-D PBC
DispCorr        = EnerPres      ; account for cut-off vdW scheme
gen_vel         = no            ; Velocity generation is off 
gen-seed        = 128742
; number of steps for center of mass motion removal
nstcomm                  = 1000

the mdout.mdp file says nstcalclr = 10, but gmxdump of the tpr file says 
nstcalclr = 0. If I set rvdw = 1.4 (> rlist), gmxdump of the file tpr is now 
correct to nstcalclr = 10.
I have double checked the manual but I couldn't find the reason of this 
behaviour.

is this a bug or am I doing wrong somewhere??

thanks for any helps


and




Andrea Spitaleri PhD
D3 - Drug Discovery & Development
Istituto Italiano di Tecnologia
Via Morego, 30 16163 Genova
cell: +39 3485188790
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