On 09/24/2012 03:53 PM, Dennis Brouwer wrote: > Last week I was repeatedly able to run all these tests on the database > without any issue but recently, all of a sudden at random, some of the > queries performed a factor 100 less. It may take hours to complete the > transaction. At the same moment we see a dramatic decrease in IO and the > CPU is nearly 100% busy in user space. > > After days of testing I may have found the cause: the ntp client. If I stop > the ntp client the problem vanishes. Any chance you are hitting this known linux bug in conjunction with a misconfigured ntp server? ie. does a # date -s now fix the cpu load? http://blog.mozilla.org/it/2012/06/30/mysql-and-the-leap-second-high-cpu-and-the-fix/comment-page-1/#comment-1471 http://serverfault.com/questions/403732/anyone-else-experiencing-high-rates-of-linux-server-crashes-during-a-leap-second -- Marcello Perathoner webmaster@gutenberg.org
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