Commodity operating systems are traditionally tuned to improve performance, but in the pursuit of faster operation, reliability is sacrificed. Application developers are currently provided with \\either\/or” abstractions that force them to choose between a fast and unreliable abstraction (which requires them to implement a guarantee within an application) or an abstraction that is slow but safe. Therefore, common abstractions, such as asynchronous file system I\/O, explicitly relax reliability guarantees (e.g., delay writes to disk by 30 seconds) in favor of better performance.<\/p>\n","protected":false},"excerpt":{"rendered":"
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