This directory contains R scripts that demonstrate the "snow" package,
and are based on the examples in chapter two of the book "Parallel R".

The example scripts can be executed using a command such as:

  % R --slave -f kmeans.R

or using the "source" function within an R session:

  > source('kmeans.R')

Using the "source" function allows the timing plots to be displayed
interactively in clusterapplylb.R, loadbalancing.R and parlapply.R.

Note that config.R will have to be edited, since it contains host and
user names that very likely don't exist on your system.

Example scripts:

  kmeans.R             Parallel kmeans example using clusterApply
  workerinit.R         Worker initialization
  clusterapplylb.R     clusterApplyLB function example
  parlapply.R          parLapply function example
  clustersplit.R       Using clusterSplit to implement parVapply
  loadbalancing.R      Using clusterApplyLB to implement parLapplyLB
  env.R                Demonstrating function serialization
  rng.R                Using clusterSetupRNG for parallel RNG
  config.R             How to configure different workers differently
  mpi.R                Simple example of creating and using an MPI cluster
  batchmpi.sh          Simple PBS/TORQUE script for executing mpi.R