If your system is not set up to deal with very large address spaces, a malfunctioning task can cause you some serious problems. On the other hand, if you are not set up for large address spaces, you could be underutilizing you main storage and hurting overall throughput. Some argue that that is a serious problem in its own right.
It is not like you can just arbitrarily limit the address space size any more. I suspect these brave new application worlds are going to *require* address space sizes far beyond what many gray haired folks would consider obscene. Even 'standard' batch often contains many sorts, and there is no better way to improve sort performance than to give them all the storage you can. Big buffers can also work minor miracles. Ideally, I vote for REGION=0m for production but not test. The reality is that testers rarely have enough information to choose an 'optimal' region size. Therefore, I guess the best compromise is to select a region size that is the largest possible on your system that does not pose undue risk to the system. That is a bit easier to sell to those that don't understand. HTH. -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of andy corpes Sent: Wednesday, April 12, 2006 7:29 AM To: IBM-MAIN@BAMA.UA.EDU Subject: Region size for batch processing Hi All, We are having discisisons regarding an optimal region size for our "standard" batch processing. Currently, we use region=0M for all of our batch jobs without any noticeable problems. Is this subparm useful anymore? it would appear that our system does not care too much, but i am concerned about an slowly increasing number of JAVA programs that have required up to 128meg to execute What is the groups opinion on this issue. -- Andy ---------------------------------------------------------------------- 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
