CH4 Overall Design
Shortcomings of CH3
MPICH has relied on the CH3 device as the primary communication device all through the "MPICH2" series and a part of the "MPICH-3.x" release series. Unfortunately, over time, the device has accumulated a number of hacks to accommodate newer communication models and network architectures, much further than what it was originally designed to do. Some of the shortcomings of the CH3 design are listed here:
- VC model: CH3 relies on communication in the context of "virtual connections" (VCs).