An evaluation of BitTorrent's performance in HPC environments

A number of novel decentralized systems have recently been developed to address challenges of scale in large distributed systems. The suitability of such systems for meeting the challenges of scale in high performance computing (HPC) systems is unclear, however. In this paper, we begin to answer this question by examining the suitability of the popular BitTorrent protocol to handle dynamic shared library distribution in HPC systems. To that end, we describe the architecture and implementation of a system that uses BitTorrent to distribute shared libraries in HPC systems, evaluate and optimize BitTorrent protocol usage for the HPC environment, and measure the performance of the resulting system. Our results demonstrate the potential viability of BitTorrent-style protocols in HPC systems, but also highlight the challenges of these protocols. In particular, our results show that the protocol mechanisms meant to enforce fairness in a distributed computing environment can have a significant impact on system performance if not properly taken into account in system design and implementation.