Back in the late 1980's there was a "coffee table book" on Data In Memory, with a bunch of studies in. VSAM LSR was one of them. It was one of the cases where CPU was SAVED across the range.
Pure speculation but I doubt that became untrue subsequently. Cheers, Martin Sent from my iPad > On 24 May 2017, at 14:07, Feller, Paul <[email protected]> wrote: > > Most of the time I suggest throwing VSAM (and non-VSAM) buffers at jobs when the business users are complaining about run time and don't have time for app tuning. They are happy to accept a little extra CPU for a decrease in run time. > > Thanks.. > > Paul Feller > AGT Mainframe Technical Support > > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of John McKown > Sent: Wednesday, May 24, 2017 07:59 > To: [email protected] > Subject: large VSAM LSR buffering vs. CPU utilization > > A post on another forum has gotten me to wondering about the size & number > of buffers in a VSAM LSR pool versus the CPU utilization needed to manage > them. Around here the idea has always been "the more buffers the better" > and no analysis has ever been done. But in today's I/O environment, I > wondering if this is unconditionally true. Given the advances in CPU and > its outpacing of the speed of even the fastest I/O (not that my shop is in > this situation), I'm wondering if this simplistic rule is still true. I.e. > Is "throw more buffers at an I/O intensive workload" still true. > > -- > Windows. A funny name for a operating system that doesn't let you see > anything. > > Maranatha! <>< > John McKown > > ---------------------------------------------------------------------- > 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-MAINUnless > 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: INFO IBM-MAIN
