This document discusses one-to-all broadcast operations in parallel computing. It describes one-to-all broadcast, where a single process sends identical data to all other processes. It then discusses implementations of one-to-all broadcast on ring/linear array, mesh, and hypercube network topologies. It analyzes the time cost of one-to-all broadcast as O(logp) message transfers. It also describes how to improve the speed using a scatter-all-to-all broadcast approach for large messages.