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atop is an ASCII full-screen performance monitor for Linux that is capable of reporting the activity of all processes even if processes have finished during the interval and daily logging of system and process activity for long-term analysis. To collect information atop switches on the process accounting mechanism in the kernel[1].

  • Crontab: /etc/cron.d/atop -> /usr/share/atop/atop.daily (INTERVAL=600)
  • Data storage: /var/log/atop


  • View interactively today recorded activity: atop -r (press t to see next interval)
  • atopsar -A[2]
  • atopsar -O Report top 3 processes consuming CPU


Jan 25 15:59:09 SERVER atopacctd[27779]: (see ATOP README about kernel bug 190271)
Jan 25 15:59:09 SERVER atopacctd[27779]: Retrying to switch on process accounting


  1. Read LWN article about atop:

See also[edit]

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