On Fri, 25 Jun 2010 15:25:58 -0500, McKown, John <[email protected]> wrote:
>> -----Original Message----- >> From: IBM Mainframe Discussion List >> [mailto:[email protected]] On Behalf Of Mark Zelden >> Sent: Friday, June 25, 2010 3:21 PM >> To: [email protected] >> Subject: Re: Delete all members of a PDS that is allocated >> >> On Fri, 25 Jun 2010 19:42:27 +0000, Ted MacNEIL >> <[email protected]> wrote: >> >> > >> >In a z/OS environment, with access methods, online >> sub-systems, utilities, >> and the like, less than 5% of the code running on the z/Box >> is user-written. >> > >> >> Where did you get that statistic from? >> >> Mark >> -- > >And does it mean: "5% of the CPU resource used on a z/OS system is consumed by user written code" or "5% of the number of lines of code for all the executable programs on a given z/OS system are user written." From context, I would guess the former. > With all the recovery code written into the OS, subsystems and ISV software, I would think the latter if anything (but I find that a hard to believe number also, but could be close to that in a small shop I guess). The system idles quite nicely at very low utilization, so saying that running production and development environments at or near 100% (which most cost conscience shops do) isn't because of "user written code" just because it invokes access methods, system services, CICS services, SQL or whatever would be a very misleading statement IMO. Mark -- Mark Zelden - Zelden Consulting Services - z/OS, OS/390 and MVS mailto:[email protected] Mark's MVS Utilities: http://home.flash.net/~mzelden/mvsutil.html Systems Programming expert at http://expertanswercenter.techtarget.com/ ---------------------------------------------------------------------- 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
