SC Conference - Activity Details

Parallel I/O Prefetching Using MPI File Caching and I/O Signatures

Surendra Byna  (Illinois Institute of Technology)
Yong Chen  (Illinois Institute of Technology)
Xian-He Sun  (Illinois Institute of Technology)
Rajeev Thakur  (Argonne National Laboratory)
William Gropp  (University of Illinois at Urbana-Champaign)
Papers Session
I/O Performance
Thursday,  11:30AM - 12:00PM
Room Ballroom E
Parallel I/O prefetching is considered to be effective in improving I/O performance. However, the effectiveness depends on determining patterns among future I/O accesses swiftly and fetching data in time, which is difficult to achieve in general. In this study, we propose an I/O signature-based prefetching strategy. The idea is to use a predetermined I/O signature of an application to guide prefetching. To put this idea to work, we first derived a classification of patterns and introduced a simple and effective signature notation to represent patterns. We then developed a toolkit to trace and generate I/O signatures automatically. Finally, we designed and implemented a thread-based client-side collective prefetching cache layer for MPI-IO library to support prefetching. A prefetching thread reads I/O signatures of an application and adjusts them by observing I/O accesses at runtime. Experimental results show that the proposed prefetching method improves I/O performance significantly for applications with complex patterns.
The full paper can be found in the IEEE Xplore Digital Library and ACM Digital Library
   IEEE Computer Society  /  ACM     2 0   Y E A R S   -   U N L E A S H I N G   T H E   P O W E R   O F   H P C