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From the screenshot above of htop output you can see that mysql is apparently using 204% of CPU usage (this is a CentOS server with dual quad-core Intel Xeons).

However only one core (8) is doing much work, and it says 100%.

One of these is presumably incorrect, what's going on here?

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I feel you should look at this link: dba.stackexchange.com/questions/2918/… –  pradeepchhetri Oct 28 '12 at 17:15
    
Hmm interesting that InnoDB is multithreaded, I though there probably was some multithreading gong on here to get that figure, but the output of htop here is still confusing. Thanks for the link! –  jwbensley Oct 29 '12 at 11:52

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