R is a free software environment for statistical computing and graphics. On the Yale Clusters there are a couple ways in which you can set up your R environment. There is no R executable provided by default; you have to choose one of the following methods to be able to run R.
The R Module
Find and Load R
Find the available versions of R version 3 with:
module avail R/3
To load version 3.6.1:
module load R/3.6.1-foss-2018b
To show installed R packages and their versions for the
module help R/3.6.1-foss-2018b
The software modules include many commonly used packages, but you can install additional packages locally, i.e. to your home directory. We recommend you install packages in an interactive job with the slurm option
-C oldest. This will ensure the compiled portions of your R library are compatible with all compute nodes on the cluster. If there is a missing library your package of interest needs you should be able to load its module. If you cannot find a dependency or have trouble installing an R package, please get in touch with us.
Grace's login nodes have newer architecture than the oldest nodes on the cluster. Always install packages in an interactive job submitted with the
-C oldest Slurm flag if you want to ensure your code will work on all generations of the compute nodes.
To get started load the R module and start R:
srun --pty -C oldest -p interactive bash module load R/3.6.1-foss-2018b R # in R > install.packages("lattice", repos="http://cran.r-project.org")
This will throw a warning like:
Warning in install.packages("lattice") : 'lib = "/ysm-gpfs/apps/software/R/3.6.1-foss-2018b/lib64/R/library"' is not writable Would you like to create a personal library ~/R/x86_64-unknown-linux-gnu-library/3.6 to install packages into? (y/n)
This will install the
lattice package to your
~/R/x86_64-unknown-linux-gnu-library/3.6 directory. There is a separate directory for R packages for each minor version of R, so packages installed with v 3.4 will not be visible from v 3.6.
If you encounter a permission error because the installation does not prompt you to create a personal library, create the directory in the default location in your home directory for the version of R you are using; e.g.,
You can customize where packages are installed and accessed for a particular R session using the .libPaths function in R:
# List current package locations > .libPaths() # Add new default location to the standard defaults, e.g. project/my_R_libs > .libPaths(c("/home/netID/project/my_R_libs/", .libPaths()))
Conda-based R Environments
If there isn't a module available for the version of R you want, you can set up your own R installation using Conda. With Conda you can manage your own packages and dependencies, for R, Python, etc.
Install Conda Packages
Most of the time the best way to install R packages for your Conda R environment is via
# Source the conda environment conda activate my_r_env # Install the lattice package (r-lattice) from the r channel (-c r) conda install r-lattice
If there are packages that conda does not provide, you can install using the
install.packages function, but this may occasionally not work as well. When you install packages with
install.packages Make sure to load your Conda environment first.
srun --pty -C oldest -p interactive bash module load miniconda source activate my_r_env R # in R > install.packages("lattice", repos="http://cran.r-project.org")
We will kill R jobs on the login nodes that are using excessive resources. To be a good cluster citizen, launch your R computation in jobs. See our Slurm documentation for more detailed information on submitting jobs.
To run R interactively, first launch an interactive job on a compute node. If your R sessions will need up to 10 GiB of RAM and up to 4 hours, you would submit you job with:
srun --pty -p interactive --mem=10G -t 4:00:00 bash
Once your interactive session starts, you can load the appropriate module or Conda environment (see above) and start R by entering
R on your command prompt. If you are happy with your R commands, save them to a file which can then be submitted and run as a batch job.
To run R in batch mode, create a plain-text batch script to submit. In that script, you can run your R script. In this case
myscript.R is in the same directory as the batch script, batch script contents shown below.
#!/bin/bash #SBATCH -J my_r_program #SBATCH --mem=10G #SBATCH -t 4:00:00 module load R/3.6.1-foss-2018b R --slave -f myscript.R
To actually submit the job, run
sbatch my_r_job.sh where the batch script above was saved as
You can run RStudio via X11 forwarding in an interactive job, but we recommend using the RStudio app via Open Ondemand instead.
Parallel R with Conda
On a cluster you may want to use R in parallel across multiple nodes. While there are a few different ways this can be achieved, we recommend using
conda to set up a specific R environment with the required packages and libraries.
In particular, you will need
doMPI. The first two can be installed via conda, while the last one must be installed manually.
# load the miniconda module module load miniconda # create the environment with the required packages conda create --name parallel_r r-base r-essentials r-doMC r-Rmpi # activate the environment conda activate parallel_r
This will produce an environment that is nearly ready to-go.
The last step is to install
doMPI, which at the moment is not available via
We can use the
install.packages method from within R to get this final piece:
(parallel_r) $ R > install.packages('doMPI')
To test it, we can create a simple R script named
library("Rmpi") n<-mpi.comm.size(0) me<-mpi.comm.rank(0) mpi.barrier(0) val<-777 mpi.bcast(val, 1, 0, 0) print(paste("me", me, "val", val)) mpi.barrier(0) mpi.quit()
Then we can launch it with an sbatch script (
#!/bin/bash #SBATCH -n 4 -N 4 -t 5:00 #SBATCH --mail-type=none module purge module load miniconda source activate parallel_r mpirun R --slave -f ex1.R
This script should execute a simple broadcast and complete in a few seconds.
Virtual Display Session
It is common for R to require a display session to save certain types of figures.
You may see a warning like "unable to start device PNG" or "unable to open connection to X11 display".
There is a tool,
xvfb, which can help avoid these issues.
xvfb-run creates a virtual display session which allows R to create these figures without an X11 session.
See the guide for xvfb for more details.