Stable Modules Available in This Release

• status: Extension of the status object.
• requests: Request tracking for asynchronous communication.
• datatype: Datatype tracking and walking.
• comm: Communication abstraction into small number of callbacks.
• empty: Basic wrapper that can be used as a starting point for new modules.
• switch-matrix: Example of a switch module to distinguish row and column communication.

Experimental Modules and Module Ideas

• delay: Introduce artificial latency increases.
• piggyback: Transparent piggybacking on MPI messages.
• checksum: Compute and verify checksums for each message.
• msgrate: Measure message rates.
• critpath: Record the critical path.
• cpprofile: Aggregate profile data along the critical path.
• nope: Trace generation for the NOPE format.