Hi Kirk! It's probable we documented this in SG24-2557 "Parallel Sysplex Batch Performance" in 1995. We talked A LOT about QSAM performance. (This is where Dave Betten of DFSORT Development REALLY went to town. :-) NOT my chapters.)
Let me know if you need anything in this area. Cheers, Martin Martin Packer Performance Consultant IBM United Kingdom Ltd +44-20-8832-5167 +44-7802-245-584 email: [email protected] Twitter ID: MartinPacker "They're figuring out that collaboration isn't a productivity hit, it makes them smarter." Sam Palmisano on BlogCentral, 26 November 2008 From: Kirk Wolf <[email protected]> To: [email protected] Date: 12/05/2009 16:47 Subject: MULTACC and MULTSDN rule of thumb Sent by: IBM Mainframe Discussion List <[email protected]> I'm writing a general purpose QSAM I/O library to be called from a HLL, where the JCL / dynamic allocation / dataset label will supply nearly all of the parameters (RECFM/BLKSIZE/LRECL, etc). I would like to make it perform well without requiring much in the way of parameter tuning by the user (performance is a key factor since this would be an alternative to a library that is slow). Looking at the new DCBE MULTACC and MULTSDN parameters, I was wondering is anyone would have suggestions as to what would be reasonable defaults. I was thinking of something like MULTSDN=6 MULTACC=3 Any thoughts or suggestions would be appreciated. Kirk Wolf Dovetailed Technologies http://dovetail.com ---------------------------------------------------------------------- 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 Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU ---------------------------------------------------------------------- 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
