Hello, I just wanted to sound people out about converting a dataspace to a common area above the bar. The main interest is the effect it would have on CPU usage.
To put it into context, the dataspace is used for a set of tables which are used by the application programs. There are around eight thousand tables currently occupying about a gigabyte of virtual storage. This is a large installation with excess of 700 million transactions per month plus a heavy batch load. The application programs make extensive use of these tables. Whenever an application program needs an element of one of the tables it calls a standard assembler module which uses access register mode to search the table in the dataspace and then returns the requested element to the application program. If the set of tables were placed above the bar then access register mode would not be needed as the tables would be directly addressable in 64 bit addressing mode. It all seems much simpler so, at first sight, it would be expected to use less CPU. A reduction in CPU would be the main justification for doing the conversion. I would be very interested on anyone's opinion on this subject. Regards, John. -- John Blythe Reid, Técnico de Sistemas de z/OS y de Sistemas Transaccionales, Barcelona, España. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
