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Improve Linux performance (IBM developerWorks)

Cameron Laird gives some tips on squeezing performance out of a Linux system. "While performance is certainly important, the best way to handle this requirement is not always obvious. Time and again, I've experienced a software challenge that followed roughly this pattern: a program is in use. Its functionality is correct. A user stops in, though, to report that it's "too slow" and needs acceleration. Someone on the team quickly hacks in a "monitor" that slows performance a bit but keeps the user informed about how much time remains for a long-running computation. Satisfaction settles in."
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