24. Partitioning in Charm++

With the latest 6.5.0 release, Charm++ has been augmented with support for partitioning. The key idea is to divide the allocated set of nodes into subsets that run independent Charm++ instances. These Charm++ instances (called partitions from now on) have a unique identifier, can be programmed to do different tasks, and can interact with each other. Addition of the partitioning scheme does not affect the existing code base or codes that do not want to use partitioning. Some of the use cases of partitioning are replicated NAMD, replica based fault tolerance, studying mapping performance etc. In some aspects, partitioning is similar to disjoint communicator creation in MPI.



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