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тАО09-06-2002 08:42 AM
тАО09-06-2002 08:42 AM
10.20
E-Box
1 CPU
I have question regarding the output in the runq-sz column of the sar -q command.
In my mind I believe a system with only one CPU should only report whole numbers in the runq-sz column. Why? Because any whole number devided by one should be that number. The only thing that may change this is if there is a one and half process. Aren't you either a process or not a process?
Please look at this output:
@ccchpcis::root_ /> sar -qM 5 10
HP-UX ccchpcis B.10.20 E 9000/806 09/06/02
11:19:02 runq-sz %runocc swpq-sz %swpocc
11:19:07 1.0 20 0.0 0
11:19:12 2.0 20 0.0 0
11:19:17 0.0 0 0.0 0
11:19:22 1.7 60 0.0 0
11:19:27 0.0 0 0.0 0
11:19:32 1.0 60 0.0 0
11:19:37 1.7 60 0.0 0
11:19:42 0.0 0 0.0 0
11:19:47 1.5 40 0.0 0
11:19:52 1.0 20 0.0 0
Average 1.4 28 0.0 0
@ccchpcis::root_ />
If you read the man page on sar -q runq-sz it states, "Average length of the run queue(s) of processes in memory and runable.
Because it states average, I could understand non-whole numbers on a multiple CPU system (IE--3CPUs--1st with 2proc in queue 2nd with 5 proc in queue and 3rd with 3proc in queue-----10 divided by 3= 3.3), but not on a single CPU system.
Am I on to anything here?? Any insight would be appreciate.
Thanks
Kirk Reindl
E-Box
1 CPU
I have question regarding the output in the runq-sz column of the sar -q command.
In my mind I believe a system with only one CPU should only report whole numbers in the runq-sz column. Why? Because any whole number devided by one should be that number. The only thing that may change this is if there is a one and half process. Aren't you either a process or not a process?
Please look at this output:
@ccchpcis::root_ /> sar -qM 5 10
HP-UX ccchpcis B.10.20 E 9000/806 09/06/02
11:19:02 runq-sz %runocc swpq-sz %swpocc
11:19:07 1.0 20 0.0 0
11:19:12 2.0 20 0.0 0
11:19:17 0.0 0 0.0 0
11:19:22 1.7 60 0.0 0
11:19:27 0.0 0 0.0 0
11:19:32 1.0 60 0.0 0
11:19:37 1.7 60 0.0 0
11:19:42 0.0 0 0.0 0
11:19:47 1.5 40 0.0 0
11:19:52 1.0 20 0.0 0
Average 1.4 28 0.0 0
@ccchpcis::root_ />
If you read the man page on sar -q runq-sz it states, "Average length of the run queue(s) of processes in memory and runable.
Because it states average, I could understand non-whole numbers on a multiple CPU system (IE--3CPUs--1st with 2proc in queue 2nd with 5 proc in queue and 3rd with 3proc in queue-----10 divided by 3= 3.3), but not on a single CPU system.
Am I on to anything here?? Any insight would be appreciate.
Thanks
Kirk Reindl
Solved! Go to Solution.
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тАО09-06-2002 08:58 AM
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тАО09-06-2002 11:31 AM
тАО09-06-2002 11:31 AM
Re: runq-sz not reporting in whole numbers with one cpu
Kirk,
It's the result of statistical averaging. The only way you would always get a whole number every time, even on a single processor machine, is if the sum of all the datapoints is always evenly divisible by the number of those datapoints. The probability of this occurring (those damned sadistics again...^o^) is so small as to be statistically insignificant. Hope this helps.
Keith
It's the result of statistical averaging. The only way you would always get a whole number every time, even on a single processor machine, is if the sum of all the datapoints is always evenly divisible by the number of those datapoints. The probability of this occurring (those damned sadistics again...^o^) is so small as to be statistically insignificant. Hope this helps.
Keith
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