The FENIX package enables online checkpoint/restart with spare-rank replacement.
See github.com/sandialabs/fenix

The package provides the following features:
* A fenix command for enabling online recovery (i.e. without relaunching a job) using spare MPI ranks

The different options for the command are explained in the documentation.

Due to some quirks of CMake and LAMMPS's fmt/format setup, building with the FENIX package may require
you to configure LAMMPS with the flag "-DCMAKE_CXX_STANDARD=20".

Once built, you can test this package using one of the input files from the examples/PACKAGES/fenix dir

== Credits and license ==

This package was developed by Matthew Whitlock (Sandia, mwhitlo@sandia.gov)
