Arun, Would you share the whole strobe report?
You can send it to me directly as an attachment. Standard VSAM and FICON does not chain across cylinder boundaries. 1 cyl = 1 CA, and with CISZ 26K there are 30 CI in a CA/cyl. Ipso facto you read 30 CI per SSCH. This increases with zHPF. -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Arun Venkatratnam Sent: Sunday, January 7, 2018 10:22 AM To: [email protected] Subject: Re: [IBM-MAIN] VSAM Performance - CPU reduction Ron, About 80% of the records qualify from the second file. I tried running the job with BUFND of 2 for the second file. It increased the EXCPs significantly (from strobe report) on the data records for the 2nd file and the CPU time went over the other runs and the elapsed time also increased. The job runs better with higher values of BUFND for the second file. You had mentioned that the job reads 30 CI for every skip-seq access. Could you please tell how did you arrive at that number. LISTCAT shows that for a CISZ of 26KB, there are 30 CI in 1 CA. Thanks Arun ---------------------------------------------------------------------- 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
