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I have a CentOS server where I'm running the top command, I can see that the process top utilize 100% CPU.

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top command will read /var/run/utmp file to get active user number. if the file is too large to read. top spends more time to read it that may occupy 100% CPU usage. reduce utmp size, the top command won't occupy much CPU usage

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    It also depends on what time interval the command uses to refresh its status display. Setting it to 0 will easily make it use 100% of CPU. Commented Jul 9, 2018 at 14:08
  • @Kusalananda YES. you are right. Commented Jul 9, 2018 at 14:10

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