Hi Tim, You may want to look at what may be keeping huge amounts of data in memory & see if there's a way to pre-sort & aggregate it. If you are not seeing a lot of I/O, the code may very well be reevaluating entire [sets of] arrays with each record.
The sort packages will far outperform an internal Rexx programmatic sort & can perform several additional functions (aggregation, multiple output files, etc) at the same time. I don't believe compiling will save you much if you're reevaluating all the data for each record & suspect Jon Goossen's reply is on track. (If you see a nonlinear cpu increase with the number of records processed, i'm pretty sure Jon hit the nail on the head.) In general, I'd very strongly recommend the system SORT as at least a preprocessor. Rexx is incredibly useful for small amounts of data (e.g. several of Mark Zelden's tools); it is equally powerful, but not very efficient with large amounts of data (which is probably why you instead see DFSORT/ICETOOL, etc. for sample programs to produce reports from moderate/large volumes SMF data). Good Luck, Peter p.s. if you have z/OS 1.13, take a look at 'SYS1.SAMPLIB(IXGRPT2)' for a good example of an ICETOOL report on the system logger (from yesterday's NaSPA presentation @IBM/NY, thanks Andrew Sica, Mark Nelson, NaSPA, et al). -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Tim Brown Sent: Wednesday, March 21, 2012 11:38 AM To: [email protected] Subject: rexx cpu intensive What can be done to prevent REXXX programs from being so CPU intensive Thanks, Tim Brown Systems Specialist - Project Leader Central Hudson Gas & Electric 284 South Ave Poughkeepsie, NY 12601 Email: [email protected] <<mailto:[email protected]>> Phone: 845-486-5643 Fax: 845-486-5921 Cell: 845-235-4255 This message contains confidential information and is only for the intended recipient. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, please notify the sender immediately by replying to this note and deleting all copies and attachments. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
