If you take a look at the logs for the job you will see the start, end
and lapsed time along with the CPU time for all steps run.
Elapsed time will ALWAYS be longer than CPU time.
Why?
1. System is multi tasking so runs many jobs at the same time depending
on capabilities.
2. Overheads for various external processes that look after the job/s.
3. Speed of operators (including robots) to load any required tapes or
exchangeable disk packs if used.
4. Others, but you get the idea.
Try running similar job/s on a PC at least under Linux within a script
with a prefix of time you will see the same.
For example running :-
--
#!/bin/bash
time rsync -avvuhh --stats --delete --exclude=/home/vince/.VirtualBox
--exclude="/home/vince/VirtualBox VMs" --exclude=/home/vince/Music2
/home /home/vince/Music2/Backups > rsync-home.log 2>rsync-home.err
exit 0
--
Output is :-
--
[vince@Applewood ~]$ sudo ./rsync-home.sh
[sudo] password for vince:
real 1m10.523s
user 0m13.190s
sys 0m10.720s
--
So CPU is 13.19 + 10.72 = 23.81 lapsed 70.52 seconds.
This was run on a multi user / tasking system with web, ftp, mysql and
other servers running.
A M/F may not break down CPU time between system and the application
depending on O/S used.
Vince
On 09/04/17 17:42, Lindy Mayfield wrote:
I only have CPU time from SMF 30 but I don't have elapsed time which is very
important. I'd like to somewhat infer that a high CPU time means the job ran a
long time.
/Lindy
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf
Of Lizette Koehler
Sent: sunnuntai 9. huhtikuuta 2017 18.55
To: [email protected]
Subject: Re: CPU Timerons/Seconds vs Wall-clock Time
What are you trying to solve?
Jobs get swapped in and out depending on what work they are doing.
Are you trying to relate wall clock to cpu time? I have seen jobs run 2 hours
wall clock time and only take 10 mins of CPU time.
Lizette
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]]
On Behalf Of Lindy Mayfield
Sent: Sunday, April 09, 2017 8:48 AM
To: [email protected]
Subject: CPU Timerons/Seconds vs Wall-clock Time
This may or may not be the dumbest question I've asked this week, but
I've been working with Linux a lot lately so that's my excuse.
For example, if an MVS job ran and consumed 10 CPU seconds (SMF 30 I
think), can I assume that it at least took 10 seconds of elapsed time to run?
Regards,
Lindy
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