Atomic Power in Forks: A Super-Logarithmic Lower Bound for Implementing Butterfly Networks in the Nonatomic Binary Fork-Join Model

Atomic Power in Forks: A Super-Logarithmic Lower Bound for Implementing Butterfly Networks in the Nonatomic Binary Fork-Join Model
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分叉中的原子力:在非原子二元分叉连接模型中实现蝴蝶网络的超对数下界

DOI:
10.1137/1.9781611976465.128
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发表时间:
2021
期刊:
Proceedings of the 2021 ACM-SIAM Symposium on Discrete Algorithms (SODA
影响因子:
--
通讯作者:
Sithinava, Nodari
Sithinava, Nodari
中科院分区:
--
文献类型:
--
作者:
Goodrich, Michael T;Jacob, Riko;Sithinava, Nodari

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我们证明了在非原子二进制叉连接模型中实现 theninput、logn 深度 FFT 电路(也称为蝴蝶网络)的跨度的 Ω (lognlog logn) 下界。在此模型中,内存访问同步仅通过 fork 操作(生成两个子线程)和 join 操作(在子线程终止时恢复父线程)进行。对于非原子二元分叉连接模型,我们的界限是渐近紧的,由于其概念优雅和捕获异步的能力,该模型最近引起了人们的兴趣。我们的界限意味着非原子二进制分叉连接模型中的超对数下界,用于实现所使用的蝴蝶合并网络,例如,在 Batcher 的双调和奇偶合并排序网络中。这个下界还意味着 fork-join 模型的原子和非原子版本的渐近分离结果,因为正如我们指出的,FFT 电路可以在原子二进制 fork-join 模型中实现,其跨度等于其电路深度。
We prove an Ω (lognlog logn) lower bound for the span of implementing theninput, logn-depth FFT circuit (also known as butterfly network) in the nonatomic binary fork-join model. In this model, memory-access synchronizations occur only through fork operations, which spawn two child threads, and join operations, which resume a parent thread when its child threads terminate. Our bound is asymptotically tight for the nonatomic binary fork-join model, which has been of interest of late, due to its conceptual elegance and ability to capture asynchrony. Our bound implies super-logarithmic lower bound in the nonatomic binary fork-join model for implementing the butterfly merging networks used, e.g., in Batcher's bitonic and odd-even mergesort networks. This lower bound also implies an asymptotic separation result for the atomic and nonatomic versions of the fork-join model, since, as we point out, FFT circuits can be implemented in the atomic binary fork-join model with span equal to their circuit depth.
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