adityapb / charmlite

A lightweight facsimile of Charm++

CharmLite

Status:

• Requires that ${env:CHARM_HOME} points to a valid Charm++ build.
  • The lightest possible build is: ./build AMPI-only <triplet> <compiler>? --with-production -DCSD_NO_IDLE_TRACING=1 -DCSD_NO_PERIODIC=1
• Only tested with non-SMP builds, SMP builds currently crash:
  • This can be fixed by correctly isolating globals as Csv/Cpv.
  • Probably fixed but needs more testing.
• Minimal support for collection communication:
  • Broadcasts and reductions only work for groups.
    • Plan to use Hypercomm distributed tree creation scheme for chare-arrays:
      • Google doc write-up.
      • Hypercomm implementation.
• No support for node-groups yet.
  • Very easy to do: add <bool NodeLevel> to existing group constructs.
• Add support for chare-arrays with a fixed or initial size.
• Add support for "location records" that indicate migratibility.
  • How should users specify whether elements can/not migrate?

Overall... need more examples; feel free to try porting your favorite example. (Be aware of collection communications limitations.)