Automatic, Application-Aware I/O Forwarding Resource Allocation

Authors: 

Xu Ji, Tsinghua University; National Supercomputing Center in Wuxi; Bin Yang and Tianyu Zhang, National Supercomputing Center in Wuxi; Shandong University; Xiaosong Ma, Qatar Computing Research Institute, HBKU; Xiupeng Zhu, National Supercomputing Center in Wuxi; Shandong University; Xiyang Wang, National Supercomputing Center in Wuxi; Nosayba El-Sayed, Emory University; Jidong Zhai, Tsinghua University; Weiguo Liu, National Supercomputing Center in Wuxi; Shandong University; Wei Xue, Tsinghua University; National Supercomputing Center in Wuxi

Abstract: 

The I/O forwarding architecture is widely adopted on modern supercomputers, with a layer of intermediate nodes sitting between the many compute nodes and backend storage nodes. This allows compute nodes to run more efficiently and stably with a leaner OS, offloads I/O coordination and communication with backend from the compute nodes, maintains less concurrent connections to storage systems, and provides additional resources for effective caching, prefetching, write buffering, and I/O aggregation. However, with many existing machines, these forwarding nodes are assigned to serve fixed set of compute nodes.

We explore an automatic mechanism, DFRA, for application-adaptive dynamic forwarding resource allocation. With I/O monitoring data that proves affordable to acquire in real time and maintain for long-term history analysis, Upon each job's dispatch, DFRA conducts a history-based study to determine whether the job should be granted more forwarding resources or given dedicated forwarding nodes. Such customized I/O forwarding lets the small fraction of I/O-intensive applications achieve higher I/O performance and scalability, meanwhile effectively isolating disruptive I/O activities. We implemented, evaluated, and deployed DFRA on Sunway TaihuLight, the current No.2 supercomputer in the world. It improves applications' I/O performance by up to 16.0x, eliminates most of the inter-application I/O interference, and has saved over 200 million of core-hours during its deployment on TaihuLight for past 8 months. Finally, our proposed DFRA design is not platform-dependent, making it applicable to the management of existing and future I/O forwarding or burst buffer resources.

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BibTeX
@inproceedings {227796,
author = {Xu Ji and Bin Yang and Tianyu Zhang and Xiaosong Ma and Xiupeng Zhu and Xiyang Wang and Nosayba El-Sayed and Jidong Zhai and Weiguo Liu and Wei Xue},
title = {Automatic, Application-Aware I/O Forwarding Resource Allocation},
booktitle = {17th {USENIX} Conference on File and Storage Technologies ({FAST} 19)},
year = {2019},
isbn = {978-1-931971-48-5},
address = {Boston, MA},
pages = {265--279},
url = {https://www.usenix.org/conference/fast19/presentation/ji},
publisher = {{USENIX} Association},
month = feb,
}