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USENIX 2002 Annual Conference - Technical Program Abstract
Conquest: Better Performance Through A Disk/Persistent-RAM Hybrid File System
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An-I A. Wang, Peter Reiher, and Gerald J. Popek
Computer Science Department
University of California, Los Angeles
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Geoffrey H. Kuenning
Computer Science Department
Harvey Mudd College
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Abstract
The rapidly declining cost of persistent RAM technologies prompts the question of when, not whether, such memory will become the preferred storage medium for many computers. Conquest is a file system that provides a transition from disk to persistent RAM as the primary storage medium. Conquest provides two specialized and simplified data paths to in-core and on-disk storage, and Conquest realizes most of the benefits of persistent RAM at a fractional cost of a RAM-only solution. As of October 2001, Conquest can be used effectively for a hardware cost of under $200.
We compare Conquest's performance to ext2, reiserfs, SGI XFS, and ramfs, using popular benchmarks. Our measurements show that Conquest incurs little overhead compared to ramfs. Compared to the disk-based file systems, Conquest achieves 24% to 1900% faster memory performance, and 43% to 96% faster performance when exercising both memory and disk.
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