Switch your databases to Flash storage. Now. Or you're doing it wrong. - High Scalability -
The right way to do it is to just not use O_DIRECT. The whole notion of "direct IO" is totally braindamaged. Just say no. This is your brain: O This is your brain on O_DIRECT: . Any questions? Our measurements show that the page cache dramatically increases latency. At the speeds of flash storage, the page cache is disastrous. Linus agreed substantially in his own post: Side note: the only reason
Flash Based Database Systems
Flash Disks E. Gal, and S. Toledo. Algorithms and Data Structures for Flash Memories. ACM Computing Surveys 2005. [pdf] Hyojun Kim and Seongjun Ahn. BPLRU: A Buffer Management Scheme for Improving Random Writes in Flash Storage, FAST 2008 [pdf] M. Rosenblum, and J. K. Ousterhout. The Design and Implementation of a Log-Structured File System. SOSP 1991. [pdf] A. Birrell, M. Isard, C. Thacker, and
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