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MrBayes is a program for Bayesian inference and model choice across a wide range of phylogenetic and evolutionary models. MrBayes uses Markov chain Monte Carlo (MCMC) methods to estimate the posterior distribution of model parameters.

Template:App Location

Available versions

  • 3.1.2

Running the application using modules

Multiple versions of MrBayes are installed in /apps/mrbayes/3.1.2/, and can be used through loading different sets of module files.

For information about the MrBayes module options, run the module spider command:

$module spider mrbayes/3.1.2

All versions are compiled with Intel 10.1, so load this first in all cases.

For the serial (single core) version load MrBayes:

$module load intel/10.1 mrbayes

The recommended MPI version is the OpenMPI 1.2.7 compiled version. To use this load:

$module load intel/10.1 openmpi/1.2.7 mrbayes

We also have an MPI version compiled with MVAPICH/0.9.9

$module load intel/10.1 mvapich/0.9.9 mrbayes

PBS Script Examples

For MPI jobs: Remember that the total number of cores cannot be greater than the total number of chains MrBayes is using. For example, if you have 2 runs, each with 4 chains, the maximum number of cores to request is 2*4=8 cores. As long as the number of cores is under 12, it is best to keep nodes=1 (nodes = physical machines) as that will keep all communication within a single node. If you need more than 12 cores, you will probably want to add :infiniband to the request. (e.g. nodes=4:ppn=8:infiniband).

{{#fileAnchor: mrbayes.MPI.pbs}} Download raw source of the [{{#fileLink: mrbayes.MPI.pbs}} mrbayes.MPI.pbs]

#PBS -N mrbayes
#PBS -M <your e-mail>
#PBS -m abe
#PBS -o mb.$PBS_JOBID.out
#PBS -e mb.$PBS_JOBID.err
#PBS -l nodes=1:ppn=8
#PBS -l pmem=500mb
#PBS -l walltime=01:00:00

#Change to the directory where the job was launched from

#Use modules to load the environment for MrBayes
module load intel/10.1
module load openmpi/1.2.7
module load mrbayes

# Define number of processors

if [ $IbEnabled -gt 0 ]; then
  echo "Running on IB-enabled node set"
  MPIRUN="mpirun --mca btl openib"
  echo "Running on GigE-enabled node set"
  MPIRUN="mpirun --mca btl ^udapl,openib --mca btl_tcp_if_include eth0"

echo This job has allocated $NPROCS nodes
echo $MPIRUN -np $NPROCS mb my_nexus.nex

#Run MrBayes using the command line from documentation.
$MPIRUN -np $NPROCS mb my_nexus.nex