Hi folks, I got a fatal error when running em.mdp. Do you think if it is the .mdp that is causing this issue?
My command line is : gmx mdrun -v -deffnm em The Fatal error: "There is no domain decomposition for 40 ranks that is compatible with the given box and a minimum cell size of 2.42098 nm. Change the number of ranks or mdrun option -rdd" em.log is as followed. Input Parameters: integrator = steep tinit = 0 dt = 0.001 nsteps = 50000 init-step = 0 simulation-part = 1 comm-mode = Linear nstcomm = 100 bd-fric = 0 ld-seed = -563054091 emtol = 1000 emstep = 0.01 niter = 20 fcstep = 0 nstcgsteep = 1000 nbfgscorr = 10 rtpi = 0.05 nstxout = 0 nstvout = 0 nstfout = 0 nstlog = 1000 nstcalcenergy = 100 nstenergy = 1000 nstxout-compressed = 0 compressed-x-precision = 1000 cutoff-scheme = Verlet nstlist = 1 ns-type = Grid pbc = xyz periodic-molecules = false verlet-buffer-tolerance = 0.005 rlist = 1 coulombtype = PME coulomb-modifier = Potential-shift rcoulomb-switch = 0 rcoulomb = 1 epsilon-r = 1 epsilon-rf = inf vdw-type = Cut-off vdw-modifier = Potential-shift rvdw-switch = 0 rvdw = 1 DispCorr = No table-extension = 1 fourierspacing = 0.12 fourier-nx = 96 fourier-ny = 96 fourier-nz = 96 pme-order = 4 ewald-rtol = 1e-05 ewald-rtol-lj = 0.001 lj-pme-comb-rule = Geometric ewald-geometry = 0 epsilon-surface = 0 implicit-solvent = No gb-algorithm = Still nstgbradii = 1 rgbradii = 1 gb-epsilon-solvent = 80 gb-saltconc = 0 gb-obc-alpha = 1 gb-obc-beta = 0.8 gb-obc-gamma = 4.85 gb-dielectric-offset = 0.009 sa-algorithm = Ace-approximation sa-surface-tension = 2.05016 tcoupl = No nsttcouple = -1 nh-chain-length = 0 print-nose-hoover-chain-variables = false pcoupl = No pcoupltype = Isotropic nstpcouple = -1 tau-p = 1 compressibility (3x3): compressibility[ 0]={ 0.00000e+00, 0.00000e+00, 0.00000e+00} compressibility[ 1]={ 0.00000e+00, 0.00000e+00, 0.00000e+00} compressibility[ 2]={ 0.00000e+00, 0.00000e+00, 0.00000e+00} ref-p (3x3): ref-p[ 0]={ 0.00000e+00, 0.00000e+00, 0.00000e+00} ref-p[ 1]={ 0.00000e+00, 0.00000e+00, 0.00000e+00} ref-p[ 2]={ 0.00000e+00, 0.00000e+00, 0.00000e+00} refcoord-scaling = No posres-com (3): posres-com[0]= 0.00000e+00 posres-com[1]= 0.00000e+00 posres-com[2]= 0.00000e+00 posres-comB (3): posres-comB[0]= 0.00000e+00 posres-comB[1]= 0.00000e+00 posres-comB[2]= 0.00000e+00 QMMM = false QMconstraints = 0 QMMMscheme = 0 MMChargeScaleFactor = 1 qm-opts: ngQM = 0 constraint-algorithm = Lincs continuation = false Shake-SOR = false shake-tol = 0.0001 lincs-order = 4 lincs-iter = 1 lincs-warnangle = 30 nwall = 0 wall-type = 9-3 wall-r-linpot = -1 wall-atomtype[0] = -1 wall-atomtype[1] = -1 wall-density[0] = 0 wall-density[1] = 0 wall-ewald-zfac = 3 pull = false rotation = false interactiveMD = false disre = No disre-weighting = Conservative disre-mixed = false dr-fc = 1000 dr-tau = 0 nstdisreout = 100 orire-fc = 0 orire-tau = 0 nstorireout = 100 free-energy = no cos-acceleration = 0 deform (3x3): deform[ 0]={ 0.00000e+00, 0.00000e+00, 0.00000e+00} deform[ 1]={ 0.00000e+00, 0.00000e+00, 0.00000e+00} deform[ 2]={ 0.00000e+00, 0.00000e+00, 0.00000e+00} simulated-tempering = false E-x: n = 0 E-xt: n = 0 E-y: n = 0 E-yt: n = 0 E-z: n = 0 E-zt: n = 0 swapcoords = no userint1 = 0 userint2 = 0 userint3 = 0 userint4 = 0 userreal1 = 0 userreal2 = 0 userreal3 = 0 userreal4 = 0 grpopts: nrdf: 219573 ref-t: 0 tau-t: 0 annealing: No annealing-npoints: 0 acc: 0 0 0 nfreeze: N N N energygrp-flags[ 0]: 0 0 energygrp-flags[ 1]: 0 0 Initializing Domain Decomposition on 56 ranks Dynamic load balancing: off Initial maximum inter charge-group distances: two-body bonded interactions: 2.164 nm, LJ-14, atoms 4632 4647 multi-body bonded interactions: 2.201 nm, CMAP Dih., atoms 4628 4646 Minimum cell size due to bonded interactions: 2.421 nm Guess for relative PME load: 0.23 Will use 40 particle-particle and 16 PME only ranks This is a guess, check the performance at the end of the log file Using 16 separate PME ranks, as guessed by mdrun Optimizing the DD grid for 40 cells with a minimum initial size of 2.421 nm The maximum allowed number of cells is: X 3 Y 3 Z 2 ------------------------------------------------------- Program: gmx mdrun, version 2016.3 Source file: src/gromacs/domdec/domdec.cpp (line 6542) MPI rank: 0 (out of 56) Fatal error: There is no domain decomposition for 40 ranks that is compatible with the given box and a minimum cell size of 2.42098 nm Change the number of ranks or mdrun option -rdd Look in the log file for details on the domain decomposition the em.mdp ; LINES STARTING WITH ';' ARE COMMENTS title = Minimization ; Title of run define=-DFLEXIBLE ; Parameters describing what to do, when to stop and what to save integrator = steep ; Algorithm (steep = steepest descent minimization) 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 energygrps = Protein ; Which energy group(s) to write to disk ; 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 = 1.0 ; Cut-off for making neighbor list (short range forces) coulombtype = PME ; Treatment of long range electrostatic interactions rcoulomb = 1.0 ; long range electrostatic cut-off rvdw = 1.0 ; long range Van der Waals cut-off pbc = xyz ; Periodic Boundary Conditions -- Gromacs Users mailing list * Please search the archive at http://www.gromacs.org/Support/Mailing_Lists/GMX-Users_List before posting! * Can't post? 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