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On Mon, Sep 07, 1998 at 11:44:44AM +1200, Chris Wedgwood wrote: > Consider the case of a large Oracle database that is used between 9am > and 5pm. After 5pm, its fairly quiet, and the kernel starts migrating > pages to disk... come the next morning, the database might initially > be fairly sluggish as the kernel will have to page in plenty when the > database gets busy.... If its fairly quiet, those pages should remain in the swap cache. I.e., they're written to disk but a copy remains in memory in case they're needed again. There's page faulting overhead for a bit in the morning, but very little waiting for disk I/O. On the other hand, if the pages are needed for something else in the meantime, they can now be dumped quickly from the swap cache. Best of both worlds, surely :-) -- Jamie - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/faq.html | ||||||||||||
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