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HPC✯

Official documentation

http://hpc.isima.fr

Developer toolset 6 and 7✯

To free yourself from the CentOS 7 constraint that limits the software suite around gcc to version 4.8.x, you can enable the Developer toolset.

In summary:

  • You activate a Developer toolset using the following commands:

  • For version 6: scl enable devtoolset-6 bash and you get the following suite:

    • gcc 6.3.x
    • gcc-c++ 6.3.x
    • gcc-gfortran 6.3.x
    • along with the corresponding tools: gdb, make, toolchain, valgrind, etc.

  • For version 7: scl enable devtoolset-7 bash and you get the following suite:

    • gcc 7.2.x
    • gcc-c++ 7.2.x
    • gcc-gfortran 7.2.x
    • along with the corresponding tools: gdb, make, toolchain, valgrind, etc.

  • You deactivate all of this by exiting your bash session with the command exit

  • You can list the available software for these Developer Toolsets:

  • For version 6: scl --list devtoolset-6
  • For version 7: scl --list devtoolset-7

Virtualenv✯

To install any Python library in your user space, you can use the official tool Virtualenv official doc.

In summary:

  • Create a directory ENV in your user directory.
  • Prepare the directory by running the command virtualenv ENV. This populates the ENV directory with the expected content for the virtualenv application.
  • Activate your virtual environment by typing the command source ENV/bin/activate.
  • The virtual environment ENV is ready. The prompt is also affected and displays the ENV information.
    • You can install your preferred libraries, for example the fictional library totoPlot: pip install totoPlot
  • To exit your virtual environment, type the command deactivate.

Note that if you want to do this in Python 2.x for the toto project:

  • virtualenv toto
  • source toto/bin/activate
  • You can import a library that is useful for the project:
    • pip install my-nice-library-in-python-2-version
  • At the end of the session, exit with the command deactivate

The same thing in Python 3.x:

  • virtualenv-3 toto-v3
  • source toto-v3/bin/activate
  • You can import a library that is useful for the project:
    • pip3 install my-nice-library-in-python-3-version
  • At the end of the session, exit with the command deactivate

To list the installed libraries in a given virtualenv:

  • pip freeze