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This is a private cluster.


  • Head node:
  • access modes: ssh
  • OpenHPC v1.3.8 with CentOS 7.6
  • 32 compute nodes (c0001-c0032) with dual 8-core Intel E5-2680 CPUs @ 2.7 GHz, 128 GB of RAM
  • Hyperthreading is enabled on all nodes, i.e., each physical core is considered to consist of two logical CPUs.
  • THECUBE Cluster Status: Ganglia.
  • Submit HELP requests: help OR by sending an email to CAC support please include THECUBE in the subject area.

File Systems

Home Directories

  • Path: ~

User home directories is located on a NFS export from the head node. Use your home directory (~) for archiving the data you wish to keep. Do NOT use this file system for computation as bandwidth to the compute nodes is very limited and will quickly be overwhelmed by file I/Os from large jobs.

Unless special arrangements are made, data in user's home directories are NOT backed up.

Scratch File System

LUSTRE file system runs Intel Lustre 2.7:

  • Path: /scratch/<user name>

The scratch file system is a fast parallel file system. Use this file system for scratch space for your jobs. Copy the results you want to keep back to your home directory for safe keeping.


  • The cluster scheduler is Slurm. All nodes are configured to be in the "normal" partition with no time limits. See Slurm documentation page for details.
  • Remember, hyperthreading is enabled on the cluster, so Slurm considers each physical core to consist of two logical CPUs.
  • Partitions (queues):
Name Description Time Limit
normal all nodes no limit


Work with Environment Modules

Set up the working environment for each package using the module command. The module command will activate dependent modules if there are any.

To show currently loaded modules: (These modules are loaded by default system configurations)

-bash-4.2$ module list

Currently Loaded Modules:
  1) autotools   2) prun/1.3   3) gnu8/8.3.0   4) openmpi3/3.1.4   5) ohpc

To show all available modules (as of Sept 30, 2013):

-bash-4.2$ module avail

-------------------- /opt/ohpc/pub/moduledeps/gnu8-openmpi3 --------------------
   boost/1.70.0    netcdf/4.6.3    pnetcdf/1.11.1
   fftw/3.3.8      phdf5/1.10.5    py3-scipy/1.2.1

------------------------ /opt/ohpc/pub/moduledeps/gnu8 -------------------------
   R/3.5.3        mpich/3.3.1       openblas/0.3.5        py3-numpy/1.15.3
   hdf5/1.10.5    mvapich2/2.3.1    openmpi3/3.1.4 (L)

-------------------------- /opt/ohpc/pub/modulefiles ---------------------------
   autotools          (L)    intel/        prun/1.3        (L)
   clustershell/1.8.1        julia/1.2.0             valgrind/3.15.0
   cmake/3.14.3              octave/5.1.0            vim/8.1
   gnu8/8.3.0         (L)    ohpc             (L)    visit/3.0.1
   gurobi/8.1.1              pmix/2.2.2

   L:  Module is loaded

To load a module and verify:

-bash-4.2$ module load R/3.5.3 
-bash-4.2$ module list

Currently Loaded Modules:
  1) autotools   3) gnu8/8.3.0       5) ohpc             7) R/3.5.3
  2) prun/1.3    4) openmpi3/3.1.4   6) openblas/0.3.5

To unload a module and verify:

-bash-4.2$ module list

Currently Loaded Modules:
  1) autotools   2) prun/1.3   3) gnu8/8.3.0   4) openmpi3/3.1.4   5) ohpc

Install R Packages in Home Directory

If you need a new R package not installed on the system, you can install R packages in your home directory using these instructions.

Manage Modules in Your Python Virtual Environment

Both python2 (2.7) and python3 (3.9) are installed. Users can manage their own python environment (including installing needed modules) using virtual environments. Please see the documentation on virtual environments on for details.

Create Virtual Environment

You can create as many virtual environments, each in their own directory, as needed.

  • python2: python -m virtualenv <your virtual environment directory>
  • python3: python3 -m venv <your virtual environment directory>

Activate Virtual Environment

You need to activate a virtual environment before using it:

source <your virtual environment directory>/bin/activate

Install Python Modules Using pip

After activating your virtual environment, you can now install python modules for the activated environment:

  • It's always a good idea to update pip first:
pip install --upgrade pip
  • Install the module:
pip install <module name>
  • List installed python modules in the environment:
pip list modules
  • Examples: Install tensorflow and keras like this:
-bash-4.2$ python3 -m venv tensorflow
-bash-4.2$ source tensorflow/bin/activate
(tensorflow) -bash-4.2$ pip install --upgrade pip
Collecting pip
  Using cached
Installing collected packages: pip
  Found existing installation: pip 18.1
    Uninstalling pip-18.1:
      Successfully uninstalled pip-18.1
Successfully installed pip-19.2.3
(tensorflow) -bash-4.2$ pip install tensorflow keras
Collecting tensorflow
  Using cached
Successfully installed absl-py-0.8.0 astor-0.8.0 gast-0.2.2 google-pasta-0.1.7 grpcio-1.23.0 h5py-2.9.0 keras-2.2.5 keras-applications-1.0.8 keras-preprocessing-1.1.0 markdown-3.1.1 numpy-1.17.1 protobuf-3.9.1 pyyaml-5.1.2 scipy-1.3.1 six-1.12.0 tensorboard-1.14.0 tensorflow-1.14.0 tensorflow-estimator-1.14.0 termcolor-1.1.0 werkzeug-0.15.5 wheel-0.33.6 wrapt-1.11.2
(tensorflow) -bash-4.2$ pip list modules
Package              Version
-------------------- -------
absl-py              0.8.0  
astor                0.8.0  
gast                 0.2.2  
google-pasta         0.1.7  
grpcio               1.23.0 
h5py                 2.9.0  
Keras                2.2.5  
Keras-Applications   1.0.8  
Keras-Preprocessing  1.1.0  
Markdown             3.1.1  
numpy                1.17.1 
pip                  19.2.3 
protobuf             3.9.1  
PyYAML               5.1.2  
scipy                1.3.1  
setuptools           40.6.2 
six                  1.12.0 
tensorboard          1.14.0 
tensorflow           1.14.0 
tensorflow-estimator 1.14.0 
termcolor            1.1.0  
Werkzeug             0.15.5 
wheel                0.33.6 
wrapt                1.11.2 

Software List

Software Path Notes
Intel Compilers, MPI, and MKL
  • module unload gnu8; module load intel/; module load impi/2019.2.187
gcc 8.3
  • module load gnu8/8.3.0 (Loaded by default)
Openmpi 3.1.4
  • module load openmpi3/3.1.4 (Loaded by default)
python 3.9.4
  • module load python/3.9.4
python 2.7.16
  • module load python/2.7.16
perl 5.30.1
  • module load perl/5.30.1
Boost 1.70.0
  • module load boost/1.70.0
cmake 3.14.3
  • module load cmake/3.14.3
hdf5 1.10.5
  • module load hdf5/1.10.5
octave 5.1.0
  • module load octave/5.1.0
netcdf 4.6.3
  • module load netcdf/4.6.3
fftw 3.3.8
  • module load fftw/3.3.8
valgrind 3.15.0
  • module load valgrind/3.15.0
visit 3.0.1
  • module load visit/3.0.1
R 3.5.3
  • module load R/3.5.3
openblas 0.3.5
  • module load openblas/0.3.5
vim 8.1
  • module load vim/8.1
julia 1.2.0
  • module load julia/1.2.0
gurobi 8.1.1
  • module load gurobi/8.1.1
  • Create a ~/gurobi.lic file with the following line:
  • gurobipy is installed in python-3.6.9. You can use it by loading that module.
remora 1.8.3
  • module load remora/1.8.3
GMAT R2019aBeta1
  • module load GMAT/R2019aBeta1