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can somebody explain me this graph please?

VMStat

What does it show? What those green peaks mean?

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looks like measurement fragments (and display/rendering quirks with close to zero values) due to sampling frequency/duration mismatch or numerical instabilities and the particular value range that you are observing. –  pfo Dec 30 '11 at 10:54

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Without knowing anything about how the graph was set up or what it is meant to monitor I'm going to take a guess that it's an attempt to show actual cpu state/time. If that indeed is the case it's a pretty big fail.

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I just installed munin. It is out of the box installation. Nothing was changed. –  MinimeDJ Dec 30 '11 at 10:58

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