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# Optimizing the steady-state throughput of scatter and reduce operations on heterogeneous platforms.

Abstract : In this paper, we consider the communications involved by the execution of a complex application, deployed on a heterogeneous grid'' platform. Such applications intensively use collective macro-communication schemes, such as scatters, personalized all-to-alls or gather/reduce operations. Rather than aiming at minimizing the execution time of a single macro-communication, we focus on the steady-state operation. We assume that there is a large number of macro-communication to perform in pipeline fashion, and we aim at maximizing the throughput, i.e. the (rational) number of macro-communications which can be initiated every time-step. We target heterogeneous platforms, modeled by a graph where resources have different communication and computation speeds. The situation is simpler for series of scatters or personalized all-to-alls than for series of reduces operations, because of the possibility of combining various partial reductions of the local values, and of interleaving computations with communications. In all cases, we show how to determine the optimal throughput, and how to exhibit a concrete periodic schedule that achieves this throughput.
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Cited literature [1 references]

https://hal-lara.archives-ouvertes.fr/hal-02101968
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Submitted on : Wednesday, April 17, 2019 - 9:10:57 AM
Last modification on : Wednesday, March 2, 2022 - 2:12:07 PM

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RR2003-33.pdf
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### Identifiers

• HAL Id : hal-02101968, version 1

### Citation

Arnaud Legrand, Loris Marchal, yves Robert. Optimizing the steady-state throughput of scatter and reduce operations on heterogeneous platforms.. [Research Report] LIP RR-2003-33, Laboratoire de l'informatique du parallélisme. 2003, 2+26p. ⟨hal-02101968⟩

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