Thanks Berk,
increasing -rdd from 1.0 to 2.5 has solved my problem. Note that the
actual distance between the two atoms in the angle restraint never
exceeds 0.9 nm, although this is a rather complex set of virtual atoms
based on the positions of other virtual atoms, each virtual atom in
its own charge group, so there could be other distances involved here.
In any event, increasing -rdd to 2.5 is fine for this system on 8
cores. This would inhibit me from going too much beyond 8 cores, but I
had not planned to do that in any event. It is also quite possible
that some value of -rdd that is greater than 1.0 and less than 2.5
would also work. I simply noted that my speed did not decrease by more
than 5% when going to -rdd 2.5 and so I accepted this.
This is great as the -pd option reduced my speed on 8 cores to 65% of
what I can get with -dd.
-- original message --
Hi,
Have you actually tried increasing -rdd to the distance the maximum distance
that can occur between the two atoms in the angle restraint?
Berk
Date: Sun, 3 Jan 2010 15:53:36 -0500
From: chris.neale at utoronto.ca
To: gmx-users at gromacs.org
Subject: [gmx-users] particle decomposition requires preliminary
trjconv -pbc mol input
Hello,
I recently used mdrun -pd while attempting to solve my problems with
angle_restraints_z
(http://lists.gromacs.org/pipermail/gmx-users/2010-January/047785.html)
since I discovered that -noddcheck is not a valid solution to the
missing interactions problems with angle restraints.
I received immediate errors with particle decomposition (mdrun -pd),
although no errors with domain decomposition (mdrun -dd).
After a couple of days of changing parameters, I discovered that
mdrun -pd requires an input .gro file in which all molecules are
whole (as the used to be written out by gromacs mdrun version 3).
My basic problem was that I had run parallel EM using domain
decomposition and then since my molecules were broken, parallel MD
using particle decomposition failed.
The solution:
grompp -f one.gro -o my.tpr
trjconv -s my.tpr -pbc mol -o two.gro
grompp -f two.gro -o my.tpr
I'm posting so that this can be found by a mailing list search for
the next time somebody runs into this as it is, as far as I can
tell, an undocumented requirement.
Chris.
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