GROMACS

To load the module for the default version of GROMACS, which initializes your environment for the GROMACS application, use module load gromacs. To select a particular software version, use module load gromacs/version. For example, use module load gromacs/5.1.2 to load GROMACS version 5.1.2; and use module help gromacs/5.1.2 to view details, such as, compiler prerequisites, additional modules required for specific executables, the suffixes of executables, etc.; some versions require specific prerequisite modules, and such details may be obtained with the command   module spider gromacs/version.

To execute a serial GROMACS versions 5 program interactively, simply run it on the command line, e.g.:

gmx pdb2gmx

Parallel multinode GROMACS versions 5 programs should be run in a batch environment with srun, e.g.:

srun gmx_mpi_d mdrun

Note that '_mpi' indicates a parallel executable and '_d' indicates a program built with double precision ('_gpu' denotes a GPU executable built with CUDA).  See the module help output for specific versions for more details on executable naming conventions.

When you log into Owens you are actually connected to a login node. To  access the compute nodes, you must submit a job to the batch system for execution. Batch jobs can request multiple nodes/cores and compute time up to the limits of the OSC systems. Refer to Queues and Reservations and Batch Limit Rules for more info. 

Interactive Batch Session

For an interactive batch session on Owens, one can run the following command:

sinteractive -A <project-account> -N 1 -n 28 -t 1:00:00

which gives you one node with 28 cores (-N 1 -n 28), with 1 hour (-t 1:00:00). You may adjust the numbers per your need.

Non-interactive Batch Job (Parallel Run)

A batch script can be created and submitted for a serial, cuda (GPU), or parallel run. You can create the batch script using any text editor in a working directory on the system of your choice. Sample batch scripts and input files for all types of hardware resources are available here:

~srb/workshops/compchem/gromacs/

This simple batch script demonstrates some important points:

#!/bin/bash
# GROMACS Tutorial for Solvation Study of Spider Toxin Peptide
# see fwspider_tutor.pdf
#SBATCH --job-name fwsinvacuo.owens
#SBATCH --nodes=2 --ntasks-per-node=28
#SBATCH --account=<project-account>

module load gromacs
pbsdcp -p 1OMB.pdb em.mdp $TMPDIR
# Use TMPDIR for best performance.
cd $TMPDIR
pdb2gmx -ignh -ff gromos43a1 -f 1OMB.pdb -o fws.gro -p fws.top -water none
editconf -f fws.gro -d 0.7
editconf -f out.gro -o fws_ctr.gro -center 2.0715 1.6745 1.914
grompp -f em.mdp -c fws_ctr.gro -p fws.top -o fws_em.tpr
srun gmx_mpi mdrun -s fws_em.tpr -o fws_em.trr -c fws_ctr.gro -g em.log -e em.edr
cat em.log
cp -p * $SLURM_SUBMIT_DIR

To load the module for the default version of GROMACS, which initializes your environment for the GROMACS application, use module load gromacs.

To execute a serial GROMACS versions 5 program interactively, simply run it on the command line, e.g.:

gmx pdb2gmx

Parallel multinode GROMACS versions 5 programs should be run in a batch environment with srun, e.g.:

srun gmx_mpi_d mdrun

Note that '_mpi' indicates a parallel executable and '_d' indicates a program built with double precision ('_gpu' denotes a GPU executable built with CUDA).  See the module help output for specific versions for more details on executable naming conventions.

When you log into Pitzer you are actually connected to a login node. To  access the compute nodes, you must submit a job to the batch system for execution. Batch jobs can request multiple nodes/cores and compute time up to the limits of the OSC systems. Refer to Queues and Reservations and Batch Limit Rules for more info. 

Interactive Batch Session

For an interactive batch session on Pitzer, one can run the following command:

sinteractive -A <project-account> -N 1 -n 40 -t 1:00:00

which gives you one node and 40 cores (-N 1 -n 40) with 1 hour (-t 1:00:00). You may adjust the numbers per your need.

Non-interactive Batch Job (Parallel Run)

A batch script can be created and submitted for a serial, cuda (GPU), or parallel run. You can create the batch script using any text editor in a working directory on the system of your choice. Sample batch scripts and input files for all types of hardware resources are available here:

~srb/workshops/compchem/gromacs/

This simple batch script demonstrates some important points:

#!/bin/bash
# GROMACS Tutorial for Solvation Study of Spider Toxin Peptide
# see fwspider_tutor.pdf
#SBATCH --job-name=fwsinvacuo.pitzer
#SBATCH --nodes=2 --ntasks-per-node=48
#SBATCH --account=<project-account>

module load gromacs
pbsdcp -p 1OMB.pdb em.mdp $TMPDIR
# Use TMPDIR for best performance.
cd $TMPDIR
pdb2gmx -ignh -ff gromos43a1 -f 1OMB.pdb -o fws.gro -p fws.top -water none
editconf -f fws.gro -d 0.7
editconf -f out.gro -o fws_ctr.gro -center 2.0715 1.6745 1.914
grompp -f em.mdp -c fws_ctr.gro -p fws.top -o fws_em.tpr
srun gmx_mpi mdrun -ntomp 1 -s fws_em.tpr -o fws_em.trr -c fws_ctr.gro -g em.log -e em.edr
cat em.log
cp -p * $SLURM_SUBMIT_DIR/