I/O Acceleration with Pattern Detection

HPDC '13. Proceedings of the 22nd International Symposium on High-performance Parallel And Distributed Computing, June 17-21, 2013.

Jun He*, John Bent‡, Aaron Torres^, Gary Grider^, Garth Gibson**, Carlos Maltzahn~, Xian-He Sun†

*University of Wisconsin
^Los Alamos National Laboratory
**Carnegie Mellon University and Panasas
~University of California, Santa Cruz
†Illinois Institute of Technology

The I/O bottleneck in high-performance computing is becoming worse as application data continues to grow. In this work, we explore how patterns of I/O within these applications can significantly affect the effectiveness of the underlying storage systems and how these same patterns can be utilized to improve many aspects of the I/O stack and mitigate the I/O bottleneck. We offer three main contributions in this paper. First, we develop and evaluate algorithms by which I/O patterns can be efficiently discovered and described. Second, we implement one such algorithm to reduce the metadata quantity in a virtual parallel file system by up to several orders of magnitude, thereby increasing the performance of writes and reads by up to 40 and 480 percent respectively. Third, we build a prototype file system with pattern-aware prefetching and evaluate it to show a 46 percent reduction in I/O latency. Finally, we believe that efficient pattern discovery and description, coupled with the observed predictability of complex patterns within many high-performance applications, offers significant potential to enable many additional I/O optimizations.





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