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?
topcommand or system monitor
screenshot of discrepancy between top and Systems Monitor
Please help me on this.
cpu cpu-load system-monitor
edited Dec 28 '18 at 12:48
Sourav Ghosh
39729
asked Dec 27 '18 at 12:52
Gowthamy.95Gowthamy.95
11
add a comment |
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?
topcommand or system monitor
screenshot of discrepancy between top and Systems Monitor
Please help me on this.
cpu cpu-load system-monitor
edited Dec 28 '18 at 12:48
Sourav Ghosh
39729
asked Dec 27 '18 at 12:52
Gowthamy.95Gowthamy.95
11
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
okay got it. Thank you
– Gowthamy.95
Dec 28 '18 at 4:58
add a comment |
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?
topcommand or system monitor
screenshot of discrepancy between top and Systems Monitor
Please help me on this.
cpu cpu-load system-monitor
edited Dec 28 '18 at 12:48
Sourav Ghosh
39729
asked Dec 27 '18 at 12:52
Gowthamy.95Gowthamy.95
11
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?
topcommand or system monitor
screenshot of discrepancy between top and Systems Monitor
Please help me on this.
cpu cpu-load system-monitor
cpu cpu-load system-monitor
edited Dec 28 '18 at 12:48
Sourav Ghosh
39729
asked Dec 27 '18 at 12:52
Gowthamy.95Gowthamy.95
11
edited Dec 28 '18 at 12:48
Sourav Ghosh
39729
asked Dec 27 '18 at 12:52
Gowthamy.95Gowthamy.95
11
edited Dec 28 '18 at 12:48
Sourav Ghosh
39729
edited Dec 28 '18 at 12:48
Sourav Ghosh
39729
edited Dec 28 '18 at 12:48
Sourav Ghosh
39729
39729
asked Dec 27 '18 at 12:52
Gowthamy.95Gowthamy.95
11
asked Dec 27 '18 at 12:52
Gowthamy.95Gowthamy.95
11
asked Dec 27 '18 at 12:52
Gowthamy.95Gowthamy.95
11
11
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
okay got it. Thank you
– Gowthamy.95
Dec 28 '18 at 4:58
add a comment |
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
okay got it. Thank you
– Gowthamy.95
Dec 28 '18 at 4:58
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
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
@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
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
okay got it. Thank you
– Gowthamy.95
Dec 28 '18 at 4:58
okay got it. Thank you
– Gowthamy.95
Dec 28 '18 at 4:58
add a comment |
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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
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
okay got it. Thank you
– Gowthamy.95
Dec 28 '18 at 4:58