Portal | Manuals | References | Downloads | Info | Programs | JCLs | Mainframe wiki | Quick Ref
IBM Mainframe Computers Forums Index
 
Register
 
IBM Mainframe Computers Forums Index Mainframe: Search IBM Mainframe Forum: FAQ Memberlist Profile Log in to check your private messages Log in
 
CPU resource limitation for CICS

 
Post new topic   Reply to topic    IBMMAINFRAMES.com Support Forums -> CICS
View previous topic :: :: View next topic  
Author Message
ckchan

New User


Joined: 19 Oct 2007
Posts: 3
Location: HK

PostPosted: Fri Oct 19, 2007 8:45 pm    Post subject: CPU resource limitation for CICS
Reply with quote

I heard from my system support that a CICS has a limitation on CPU resource (around 2xx MIPS), and also a CICS can only 'use' 1 CPU. Anyone know if it is true? and can you give me some documentation from IBM for the above issues?

Thanks a lot.
Back to top
View user's profile Send private message

enrico-sorichetti

Global Moderator


Joined: 14 Mar 2007
Posts: 10457
Location: italy

PostPosted: Sat Oct 20, 2007 2:05 pm    Post subject: Reply to: CPU resource limitation for CICS
Reply with quote

Unless Your systems support people played some USELESS tricks in defining
the performance parameters of You MVS system both assertions are Not true!

MVS tuning is performance oriented, which means to give each process
all the resources ( CPU, STORAGE, I/O's ) needed to achieve it' s performance target.

There is not ABSOLUTELY the need to artificially limit the resources used by a
process...

if there is no resource contention, why impose limits ???

( higher priority processes will always be given more resources than a
competing lower priority one )
Back to top
View user's profile Send private message
ckchan

New User


Joined: 19 Oct 2007
Posts: 3
Location: HK

PostPosted: Sat Oct 20, 2007 3:29 pm    Post subject: Re: Reply to: CPU resource limitation for CICS
Reply with quote

thanks for your comment.

In my understanding, system supports can 'set' the upper limit of CPU usage for batch jobs (class?), online jobs (class?) in order to have a better management of resourse(e.g. avoid batch jobs to draw to much CPU time and affect the online jobs performance).So ... is it possible to allow the CICS to have such 'setting' to bound the CPU resource?


enrico-sorichetti wrote:
Unless Your systems support people played some USELESS tricks in defining
the performance parameters of You MVS system both assertions are Not true!

MVS tuning is performance oriented, which means to give each process
all the resources ( CPU, STORAGE, I/O's ) needed to achieve it' s performance target.

There is not ABSOLUTELY the need to artificially limit the resources used by a
process...

if there is no resource contention, why impose limits ???

( higher priority processes will always be given more resources than a
competing lower priority one )
Back to top
View user's profile Send private message
enrico-sorichetti

Global Moderator


Joined: 14 Mar 2007
Posts: 10457
Location: italy

PostPosted: Sat Oct 20, 2007 3:40 pm    Post subject: Reply to: CPU resource limitation for CICS
Reply with quote

Setting an upper limit, will enforce the rule also when there is no need for it !!

If the parameters are set in the right way,
and it takes a little bit of work and analysis of the performance reports,
higher IMPORTANCE processes ,
both in GOAL mode, and in compatibility mode ( ICS,IPS)
will be given the necessary resources to achieve their target response time

so ... again no need to put an artificial high water mark on resource utilization

Unless, You/your system people are mixing concepts from "LPAR capping"
Back to top
View user's profile Send private message
ckchan

New User


Joined: 19 Oct 2007
Posts: 3
Location: HK

PostPosted: Sun Oct 21, 2007 6:02 am    Post subject: Re: Reply to: CPU resource limitation for CICS
Reply with quote

Ok. I will check with my support colleagues again. Thx.
enrico-sorichetti wrote:
Setting an upper limit, will enforce the rule also when there is no need for it !!

If the parameters are set in the right way,
and it takes a little bit of work and analysis of the performance reports,
higher IMPORTANCE processes ,
both in GOAL mode, and in compatibility mode ( ICS,IPS)
will be given the necessary resources to achieve their target response time

so ... again no need to put an artificial high water mark on resource utilization

Unless, You/your system people are mixing concepts from "LPAR capping"
Back to top
View user's profile Send private message
View previous topic :: :: View next topic  
Post new topic   Reply to topic    IBMMAINFRAMES.com Support Forums -> CICS All times are GMT + 6 Hours
Page 1 of 1

 

Search our Forum:

Similar Topics
Topic Author Forum Replies Posted
No new posts How do you attach a DB2 plan to a CIC... John Poulakos DB2 0 Wed Apr 18, 2018 1:49 am
No new posts Call COBOL or PLI with a click from w... vaibhav gs All Other Mainframe Topics 1 Mon Apr 16, 2018 7:29 pm
No new posts How do I define a DB2 plan for a web ... John Poulakos CICS 5 Sat Apr 14, 2018 1:58 am
No new posts VSAM file NOT Found error while proce... SumaReva CICS 5 Wed Apr 11, 2018 9:54 pm
No new posts Limit in Length for a CICS START seahawk789 CICS 6 Mon Apr 02, 2018 8:34 pm

Facebook
Back to Top
 
Job Vacancies | Forum Rules | Bookmarks | Subscriptions | FAQ | Polls | Contact Us