All-to-all communication is a computer communication method in which each sender transmits messages to all receivers within a group. This contrasts with the point-to-point method in which each sender communicates with one receiver.
All-to-all communication is the most general communication method, and is also the most intensive in the sense that a large number of messages are required.
All-to-all communication may be performed as "all scatter" in which each sender performs its own scatter in which the messages are distinct for each receiver, or "all broadcast" in which they are the same.
- Encyclopedia of Parallel Computing, Volume 4 by David Padua 2011 ISBN 0387097651 page 43
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