On Wed, 4 Aug 2010 13:24:02 -0500, Staller, Allan wrote: >In days of yore, long, long ago, and far, far, away, it made sense to code at the step level. > >OS/MVT used a contiguous storage algorithm
More precisely, MVT had a single address space >and reserved that storage for the life of a job step.. >If STEPB required more storage that STEPA, the possibility >existed for significant execution delays until a >contiguous block of real storage large enough for STEPB >to execute became available. At the shop where I started in 1970, we did just the opposite. All regions were coded on the JOB card and there was a standard for what the region would be. IIRC, Class A always used 110K. This was to avoid storage fragmentation. Today it is much less important. I usually code region on the JOB statement, but that's a personal preference. I don't believe in changing existing JCL without a good reason. -- Tom Marchant ---------------------------------------------------------------------- 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
