System Monitor and top reporting wildly different cpu usage for process












0














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.










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  • 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
    2 days ago










  • @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
    2 days ago










  • 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
    2 days ago










  • okay got it. Thank you
    – Gowthamy.95
    2 days ago
















0














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.










share|improve this question









New contributor




Gowthamy.95 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.




















  • 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
    2 days ago










  • @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
    2 days ago










  • 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
    2 days ago










  • okay got it. Thank you
    – Gowthamy.95
    2 days ago














0












0








0


1





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.










share|improve this question









New contributor




Gowthamy.95 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











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.







cpu cpu-load system-monitor






share|improve this question









New contributor




Gowthamy.95 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question









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Check out our Code of Conduct.









share|improve this question




share|improve this question








edited yesterday









Sourav Ghosh

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asked 2 days ago









Gowthamy.95

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11




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Gowthamy.95 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






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Check out our Code of Conduct.












  • 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
    2 days ago










  • @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
    2 days ago










  • 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
    2 days ago










  • okay got it. Thank you
    – Gowthamy.95
    2 days ago


















  • 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
    2 days ago










  • @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
    2 days ago










  • 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
    2 days ago










  • okay got it. Thank you
    – Gowthamy.95
    2 days ago
















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
2 days ago




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
2 days ago












@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
2 days ago




@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
2 days ago












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
2 days ago




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
2 days ago












okay got it. Thank you
– Gowthamy.95
2 days ago




okay got it. Thank you
– Gowthamy.95
2 days ago















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