On multi-user, multi-job parellel enviromnent build upon
workstation clusters, fast user level communication and
synchronization method is needed.
We are developping a high speed, enhanced gigabit switching
network system which cooperates our general purpose massively
parallel operating system.  Memory based communication is the
basic communication method for user level communication.

We have implemented memory based communication on existing
operating system for testing our network interface card, and
evaluate the performance of it.  We also describe the mechanism
required by operating system for realizing fast
memory based communication.