Chris, Thanks for confirming my assumption that your product uses its optimized I/O facilities for SORTIN/OUT.
I agree that there is no single "best way" to design a process. As usual, "it depends...". Peter -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Blaicher, Christopher Y. Sent: Monday, November 25, 2013 11:10 PM To: [email protected] Subject: Re: Has anyone measured CPU savings using external SORT's vs internal (COBOL) SORT's? John, SyncSort has for many years not used any regular access methods in the normal course of processing SORTIN or SORTOUT. There are exceptions to this such as compressed files where we have to use BSAM, but for the most part, we do not use traditional access methods. As to the original subject matter, it is impossible to make a single general statement about what way is the best way to design a process. If you are using a COBOL program or exit to transform data or select a subset of records, in general it is faster both in elapsed time and CPU time to use the many features of a sort (INCLUDE/OMIT/INREC/OUTREC/OUTFILE) rather than an exit. As with everything in computing, your mileage may vary. Chris Blaicher Principal Software Engineer, Software Development Syncsort Incorporated 50 Tice Boulevard, Woodcliff Lake, NJ 07677 P: 201-930-8260 | M: 512-627-3803 E: [email protected] -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of John Gilmore Sent: Monday, November 25, 2013 11:49 AM To: [email protected] Subject: Re: Has anyone measured CPU savings using external SORT's vs internal (COBOL) SORT's? Note that the highly efficient i/o operations of SYNCSORT and DFSORT are their internal ones. They must and do use access methods to read sortin and write sortout. They do of course use these access methods more efficiently than many/most COBOL programs, but the big i/o savings are elsewhere. John Gilmore, Ashland, MA 01721 - USA -- This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
