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docs: add single node concurrent build example (#20416)

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Tamara Dahlgren 2020-12-17 08:23:55 -08:00 committed by GitHub
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lib/spack/docs/packaging_guide.rst
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@ -1864,14 +1864,21 @@ of ``mpich`` using the following command:
$ srun -N 2 -n 8 spack install -j 4 mpich@3.3.2 $ srun -N 2 -n 8 spack install -j 4 mpich@3.3.2
This will create eight concurrent four-job installation on two different This will create eight concurrent, four-job installs on two different
nodes. nodes.
Alternatively, you could run the same installs on one node by entering
the following at the command line of a bash shell:
.. code-block:: console
$ for i in {1..12}; do nohup spack install -j 4 mpich@3.3.2 >> mpich_install.txt 2>&1 &; done
.. note:: .. note::
The effective parallelism will be based on the maximum number of The effective parallelism is based on the maximum number of packages
packages that can be installed at the same time, which will limited that can be installed at the same time, which is limited by the
by the number of packages with no (remaining) uninstalled dependencies. number of packages with no (remaining) uninstalled dependencies.
.. _dependencies: .. _dependencies: