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When I monitor a process using top command it returns the CPU usage for the process like 99.5%. But when I monitor a same process using system monitor (Process tab) for the particular it shows 25%.

  • What is the cause of this discrepancy?
  • Which value is correct? top command or system monitor

screenshot of discrepancy between top and Systems Monitor

Please refer top command screenshot

Please refer system monitor screenshot

Please help me on this.

  • Top reports usage pr (virtual) cpu-core, so 2 cores with hyper-threadings gives 4 cpu's = 100%. System monitor reports 100% for the whole system. – Soren A Dec 27 '18 at 14:07
  • @SorenA Thanks a lot..Basically top command returns the total cpu usage of all cores while System monitor reports average of that isn't it? Am I correct? – Gowthamy.95 Dec 27 '18 at 14:43
  • more or less ... what I tried to say was that in top each virtual cpu counts as 100%, so if you have 2 cores with hyper threading it will count as 400%. System monitor counts the whole system as 100%, so one virtuel cpu is 25%. – Soren A Dec 27 '18 at 15:32

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