Measuring CPU usage with top - dependency on delay?
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I try to measure per process CPU utilization. There are many answers to other questions which suggest to use top for this. My top call looks like this:
top -b -n 2 -d <delay> -p <pid> | tail -1 | awk '{print $7}'
My question is now how to choose the delay. Seemingly, the %CPU values I get, are highly dependent on the delay I choose. When I choose -d 1 (1 second) I only get xx.0 %, sometimes xx.9 %. When I choose -d 2 I only get xx.0 % or xx.5 %. With d=1.5 I always get xx.0 %, xx.3% or xx.7 % (Probably, these are thrids?). When I use d=1.7 I get nearly all decimal digits.
Why is this the case?
linux top cpu-usage
asked Nov 22 at 11:18
lukasl1991
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I try to measure per process CPU utilization. There are many answers to other questions which suggest to use top for this. My top call looks like this:
top -b -n 2 -d <delay> -p <pid> | tail -1 | awk '{print $7}'
My question is now how to choose the delay. Seemingly, the %CPU values I get, are highly dependent on the delay I choose. When I choose -d 1 (1 second) I only get xx.0 %, sometimes xx.9 %. When I choose -d 2 I only get xx.0 % or xx.5 %. With d=1.5 I always get xx.0 %, xx.3% or xx.7 % (Probably, these are thrids?). When I use d=1.7 I get nearly all decimal digits.
Why is this the case?
linux top cpu-usage
asked Nov 22 at 11:18
lukasl1991
12
New contributor
lukasl1991 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I try to measure per process CPU utilization. There are many answers to other questions which suggest to use top for this. My top call looks like this:
top -b -n 2 -d <delay> -p <pid> | tail -1 | awk '{print $7}'
My question is now how to choose the delay. Seemingly, the %CPU values I get, are highly dependent on the delay I choose. When I choose -d 1 (1 second) I only get xx.0 %, sometimes xx.9 %. When I choose -d 2 I only get xx.0 % or xx.5 %. With d=1.5 I always get xx.0 %, xx.3% or xx.7 % (Probably, these are thrids?). When I use d=1.7 I get nearly all decimal digits.
Why is this the case?
linux top cpu-usage
asked Nov 22 at 11:18
lukasl1991
12
New contributor
lukasl1991 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I try to measure per process CPU utilization. There are many answers to other questions which suggest to use top for this. My top call looks like this:
top -b -n 2 -d <delay> -p <pid> | tail -1 | awk '{print $7}'
My question is now how to choose the delay. Seemingly, the %CPU values I get, are highly dependent on the delay I choose. When I choose -d 1 (1 second) I only get xx.0 %, sometimes xx.9 %. When I choose -d 2 I only get xx.0 % or xx.5 %. With d=1.5 I always get xx.0 %, xx.3% or xx.7 % (Probably, these are thrids?). When I use d=1.7 I get nearly all decimal digits.
Why is this the case?
linux top cpu-usage
linux top cpu-usage
asked Nov 22 at 11:18
lukasl1991
12
New contributor
lukasl1991 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Nov 22 at 11:18
lukasl1991
12
New contributor
lukasl1991 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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edited Nov 23 at 8:45
asked Nov 22 at 11:18
lukasl1991
12
New contributor
lukasl1991 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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asked Nov 22 at 11:18
lukasl1991
12
asked Nov 22 at 11:18
lukasl1991
12
12
New contributor
lukasl1991 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
lukasl1991 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
lukasl1991 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
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lukasl1991 is a new contributor. Be nice, and check out our Code of Conduct.
lukasl1991 is a new contributor. Be nice, and check out our Code of Conduct.
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