  Checkpoint/restart (C/R) provides fault-tolerant computing capability,
enables long running applications, and provides scheduling flexibility for
computing centers to support diverse workloads with different priority. It is
therefore vital to get transparent C/R capability working at NERSC. MANA, by
Garg et. al., is a transparent checkpointing tool that has been selected due to
its MPI-agnostic and network-agnostic approach. However, originally written as
a proof-of-concept code, MANA was not ready to use with NERSC's diverse
production workloads, which are dominated by MPI and hybrid MPI+OpenMP
applications. In this talk, we present ongoing work at NERSC to enable MANA for
NERSC's production workloads, including fixing bugs that were exposed by the
top applications at NERSC, adding new features to address system changes,
evaluating C/R overhead at scale, etc. The lessons learned from making MANA
production-ready for HPC applications will be useful for C/R tool developers,
supercomputing centers and HPC end-users alike.
