CCL: a portable and tunable collective communication library forscalable parallel computers
Bala, V.; Bruck, J.; Cypher, R.; Elustondo, P.; Ho, A.; Ching-Tien Ho; Kipnis, S.; Snir, M.
Parallel and Distributed Systems, IEEE Transactions on
Volume 6, Issue 2, Feb 1995 Page(s):154 - 164
Digital Object Identifier 10.1109/71.342126
Summary:A collective communication library for parallel computers includes
frequently used operations such as broadcast, reduce, scatter, gather,
concatenate, synchronize, and shift. Such a library provides users with
a convenient programming interface, efficient communication operations,
and the advantage of portability. A library of this nature, the
Collective Communication Library (CCL), intended for the line of
scalable parallel computer products by IBM, has been designed. CCL is
part of the parallel application programming interface of the recently
announced IBM 9076 Scalable POWERparallel System 1 (SP1). In this paper,
we examine several issues related to the functionality, correctness, and
performance of a portable collective communication library while
focusing on three novel aspects in the design and implementation of CCL:
1) the introduction of process groups, 2) the definition of semantics
that ensures correctness, and 3) the design of new and tunable
algorithms based on a realistic point-to-point communication model
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