Dear Gromacs users,
I am trying to simulate a large system (roughly 3M atoms including solvent)
on Gromacs version 4.5.5. I am having difficulty having mdrun execute
parallel calculations. I have run several variations (described below) of
attempting steepest descent minimization and the simulation finishes
successfully only if I set the number of threads to just 1.
variation 1: mdrun -v -deffnm steep_to_1000
Making 1D domain decomposition grid 8 x 1 x 1, home cell index 0 0 0
Program mdrun, VERSION 4.5.5
Source code file: /share/apps/pkg/gromacs-4.5.5/src/mdlib/domdec_top.c,
8346 of the 4590648 bonded interactions could not be calculated because
some atoms involved moved further apart than the multi-body cut-off
distance (1 nm) or the two-body cut-off distance (1 nm), see option -rdd,
for pairs and tabulated bonds also see option -ddcheck
variation 2: mdrun -v -deffnm steep_to_1000 -noddcheck
Result: identical to variation 1 (6528 of the 4422192 bonded interactions
variation 3: mdrun -v -deffnm steep_to_1000 -nt 1
Successfully finishes run without incident (but very slowly)
I also tested a simulation of a smaller system (~15k atoms), which ran
without incident on a 1D domain decomposition grid 8 x 1 x 1.
What parameters do you recommend I change to allow for multithreading?
Thank you in advance,
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