[gmx-users] GROMACS 4.5.1 mdrun re-compile for MPI
adh38 at cornell.edu
Thu Mar 24 13:51:56 CET 2011
Dear GROMACS users,
I successfully installed GROMACS 4.5.1 several months ago on a Mac Pro with
12 CPUs, and the "mdrun" command (not "mpirun mdrun_mpi") allows parallel
simulations--it automatically uses multiple processors, while the number of
processors can be manually specified as N with the flag "mdrun -nt N". I
understand that this is a feature of GROMACS 4 and later. Now I am making
minor changes to the mdrun source code, and I want to recompile such that
the parallel version of mdrun is updated with my changes. But when I run:
make mdrun (or just make)
make install-mdrun (or just make install)
from the top-level source directory, the only executables that are updated
are the ones with the _mpi suffix, such as mdrun_mpi. The version of mdrun
in src/kernel/ is updated, but this one has no -nt flag and cannot seem to
run on multiple processors. And when I run
mpirun -np N mdrun_mpi [options],
the same simulation is started separately on each processor, leading to a
crash. If I use
mpirun -np 1 -cpus-per-proc N mdrun_mpi [options],
I get an error message that this is not supported on my computer ("An
attempt to set processor affinity has failed").
I can't configure the input .tpr file for parallel because grompp doesn't
have the -np flag in GROMACS 4.
How can I update the parallel-capable "mdrun" executable with my changes?
Thanks in advance,
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