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rajeshsundarraj
New User
Joined: 24 Sep 2010
Posts: 2
Location: chennai
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CPU% Allocation to Batch jobs
In Batch run, there is a difference in CPU% allocation to different batch jobs, eventhough the CLASS is same for the jobs.
Below are the three instances which I have taken from SDSF ; DA
Instance 1:
| Code: |
NP JOBNAME CPU% ASID ASIDX EXCP-Cnt CPU-Time SR Status SysName SPag SC
JOBAS72D 0.87 67 0043 432426 101.50 SYSA 100
JOBAS74D 0.17 96 0060 12918 1.11 SYSA 100
JOBAT48D 1.11 94 005E 63400 4.76 SYSA 100
JOBAT74D 0.17 117 0075 12403 1.07 SYSA 100
JOBAU48D 1.14 289 0121 77317 5.83 SYSA 100
JOBA0G2D 10.56 100 0064 94867 94.48 SYSA 100
JOBA098B 2.71 92 005C 62194 16.95 SYSA 100 |
Instance 2:
| Code: |
NP JOBNAME CPU% ASID ASIDX EXCP-Cnt CPU-Time SR Status SysName SPag SCP
JOBAS72D 0.84 67 0043 434708 102.04 SYSA 90
JOBAS74D 0.18 96 0060 14294 1.22 SYSA 90
JOBAV74D 0.17 280 0118 13523 1.17 SYSA 90
JOBAW74D 0.19 288 0120 13265 1.23 SYSA 90
JOBA0G2D 10.83 100 0064 101412 101.49 SYSA 90
JOBA042D 1.38 93 005D 28731 13.01 SYSA 90
JOBA049D 2.93 88 0058 1496 1.89 SYSA 90 |
Instance 3:
| Code: |
NP JOBNAME CPU% ASID ASIDX EXCP-Cnt CPU-Time SR Status SysName SPag S
JOBAS72D 0.76 67 0043 436089 102.36 SYSA 93
JOBAS74D 0.16 96 0060 15107 1.29 SYSA 93
JOBAT48D 1.08 94 005E 79321 5.93 SYSA 93
JOBAT74D 0.16 117 0075 14506 1.25 SYSA 93
JOBA0G2D 11.94 100 0064 106232 106.59 SYSA 93
JOBA049D 8.58 88 0058 3956 5.56 SYSA 93
JOBA092D 5.97 99 0063 287855 91.20 SYSA 93 |
In the above case, Two concerned jobs are JOBAS72D(first job in the list) and JOBA0G2D(high CPU%).
Mainframe team told that it will be decided by CPU internally.
JOBAS72D : it copies one VSAm to another VSAm using IDCAMS repro
JOBA0G2D : Applicaion Program.
Is there any possibility to control CPU% allocation apart from class parameter.
Just waiting for your views. If you need any more information, please let me know. |
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dick scherrer
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Joined: 23 Nov 2006
Posts: 19244
Location: Inside the Matrix
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Hello and welcome to the forum,
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| there is a difference in CPU% allocation to different batch jobs |
Some batch jobs require more cpu time than others. Some jobs use less cpu% because they are "waiting" on something (i/o to some file, a database interaction, etc).
From what you have posted, i see nothing that indicates a problem. The 2 jobs you mention are the 2 jobs that are doing the most work at the time the "snapshots" were taken.
Why does someone believe there is reason for concern?
When posting things that need to be aligned (code, jcl, file data, screen data) use the Code tag. Then Preview to see your post the way it will appear to the forum. When it looks as you want, Submit. |
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rajeshsundarraj
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Joined: 24 Sep 2010
Posts: 2
Location: chennai
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Thanks for the Greeting Mr. Scherrer.
Yes, Some jobs requires more CPU time than others.
This is not the problem, but analysing various factors affecting Elapsed time apart from CPU time, EXCP, Mainframe Load, database access and storage factors.
I saw this CPU% factor and misunderstood that it is Allocation factor.
| Quote: |
| Some jobs use less cpu% |
Above statement made me to think that it is not the allocation factor but it is used one.
Thanks for your reply and your suggestion on alignment. I will take care.  |
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dick scherrer
Moderator Emeritus
Joined: 23 Nov 2006
Posts: 19244
Location: Inside the Matrix
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Hello,
I'm not familiar with the term "allocation factor". This is not an industry-wide term?
Keep in mind the cpu% is the percent of the cpu currently being used by the process. The CPU Time is an accumulation of cpu used. They are not directly related. |
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Robert Sample
Global Moderator
Joined: 06 Jun 2008
Posts: 8696
Location: Dubuque, Iowa, USA
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Workload Manager (WLM) is the basic control mechanism for the system -- including CPU -- and it is possible to select individual jobs to run in certain service classes in WLM. So yes, there are ways, other than job class, to control use of the CPU. Workload management can be a very complex topic and there are manuals (and Redbooks) available to help optimize system resource usage.
However, there is nothing unusual or different about jobs in the same job class using different amount of CPU -- some jobs need more CPU time than other jobs. If you are really that concerned, talk to your site support group about the WLM policies in use at your site. |
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