[CentOS] vmstat and loadavg disagree about system load
Valeri Galtsev
galtsev at kicp.uchicago.eduThu Oct 9 15:52:29 UTC 2014
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On Wed, October 8, 2014 11:23 pm, John R Pierce wrote: > On 10/8/2014 9:00 PM, Mingfei Hua wrote: >> The first two number of vmstat is running process and blocked process, >> the sum of the two number should equal to system load. But it's >> inconsistent in this case. > > linux load average counts processes that are doing disk IO or network IO > as being 'ready'. they aren't actually running, but neither are they > waiting on user input ('blocked' per vmstat's version of reality). > If I'm not mistaken the "cost" of switching between processes also adds to system load... ++++++++++++++++++++++++++++++++++++++++ Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ++++++++++++++++++++++++++++++++++++++++
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