Virtual-channel flow control
Dally, W.J.
Parallel and Distributed Systems, IEEE Transactions on
Volume 3, Issue 2, Mar 1992 Page(s):194 - 205
Digital Object Identifier 10.1109/71.127260
Summary:Network throughput can be increased by dividing the buffer storage
associated with each network channel into several virtual channels. Each
physical channel is associated with several small queues, virtual
channels, rather than a single deep queue. The virtual channels
associated with one physical channel are allocated independently but
compete with each other for physical bandwidth. Virtual channels
decouple buffer resources from transmission resources. This decoupling
allows active messages to pass blocked messages using network bandwidth
that would otherwise be left idle. The paper studies the performance of
networks using virtual channels using both analysis and simulation.
These studies show that virtual channels increase network throughput, by
a factor of four for 10-stage networks, and reduce the dependence of
throughput on the depth of the network
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