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The MySQL “swap insanity” problem and the effects of the NUMA architecture - http://jcole.us/blog/archives/2010/09/28/mysql-swap-insanity-...
in many cases, “real” useful memory is being swapped: primarily parts of InnoDB’s buffer pool. When it’s needed once again, a big performance hit is taken to swap it back in, causing random delays in random queries. ‎- ati

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