Miklos, If this is job is running in an LPAR with dedicated IPs and no other work is running, and no other LPAR is doing any significant IO then you should expect CPU time to vary by one or two percent.
If you cannot run in those repeatable conditions then variations of up to 10% would be normal. And remember that the shorter the job the greater the variation because you program is calling other system services just to get set-up and started in the initiator. Ron > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On > Behalf Of Miklos Szigetvari > Sent: Monday, February 04, 2008 9:57 AM > To: IBM-MAIN@BAMA.UA.EDU > Subject: Re: [IBM-MAIN] CPU time differences for the same job > > No CICS or DB2 or WEB > It is mostly in C++, the system has a lot of real storage so no > relevant > pageing. > > > Lizette Koehler wrote: > > >Before I could guess, I would need more information > > > >Does this job use DB2? > >Does it use CICS? > >Does it use WEBSPHERE? > > > >Is it accessing data on a server? > >What lanaguage is it written in? > >Any dasd or communications issues at the time? > > > >If I have a looping situation (transaction, batch job, tso user) that > is consuming the CPU, then all other work might suffer. > > > >What is the workload during the anomalous run time? Workload can have > an impact, but so can external forces. Without more detail, I am not > sure you can get a good rule of thumb. > > > >I have seen the same job run with many hours difference. Mainly due > to it communicating with a server that was not responding. I would > think that if everything is working well, you should see little run > time difference. > > > > > I'm always saying "little runtime difference", but 5 or 10% CPU time is > little in 1 min CPU runtime ? > > >Just my opinion. > > > >Lizetet > > > > > > > > > > > >>I got this question time to time: > >>What is the maximum CPU time difference for the same job, between > >>repeated runs, under different system load ? > >> > >> > > > >---------------------------------------------------------------------- > >For IBM-MAIN subscribe / signoff / archive access instructions, > >send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO > >Search the archives at http://bama.ua.edu/archives/ibm-main.html > > > > > > > > > > -- > Miklos Szigetvari > > Development Team > ISIS Information Systems Gmbh > tel: (+43) 2236 27551 570 > Fax: (+43) 2236 21081 > > E-mail: [EMAIL PROTECTED] > > Info: [EMAIL PROTECTED] > Hotline: +43-2236-27551-111 > > Visit our Website: http://www.isis-papyrus.com > --------------------------------------------------------------- > This e-mail is only intended for the recipient and not legally > binding. Unauthorised use, publication, reproduction or > disclosure of the content of this e-mail is not permitted. > This email has been checked for known viruses, but ISIS accepts > no responsibility for malicious or inappropriate content. > --------------------------------------------------------------- > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO > Search the archives at http://bama.ua.edu/archives/ibm-main.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
