I did a lot of work in this area 20 years ago.
If you have MXG in your shop, the ANALBLSR will suggest jobs that can benefit from Batch LSR, assuming the proper SMF types are being collected and processed by MXG. Documentation is in member ADOCBLSR. It has been 18 years since I have had access to MXG, so the member names could have changed. If you happen to have the Data Optimizer component of the BMC Mainview Batch Optimizer, then you can forgo the JCL changes by adding specifications by various combinations of JOB and/or DDNAME and/or DSNAME in that product’s parameter files. Always use separate pools for the index and data components. If the number of index CI’s is manageable, consider choosing enough index buffers to make the index component resident. Memory was more constrained when I performed my tuning activities than now. The choice of how many buffers to assign to each CISIZE in each pool is a case of not adding even more buffers when the benefit is diminishing. For tuning purposes, I would refer you to ITSO manual SG24-2557-00, “System/390 MVS Parallel Sysplex Batch Performance”. I am pretty sure that I downloaded it from the Redbooks site years ago, but it is no longer there. I have found it on the Wayback Machine at: http://web.archive.org/web/20060107154104/http://www.redbooks.ibm.com:80/redbooks/pdfs/sg242557.pdf <http://web.archive.org/web/20060107154104/http:/www.redbooks.ibm.com:80/redbooks/pdfs/sg242557.pdf> This manual describes the use of the F61 (EID EF61) GTF trace records and has a sample ICETOOL job to get a feel on how the keys (really CI numbers) are distributed. Note that VSAM was enhanced after publication of this manual, so the field described in Appendix A at 33,4 is now the control interval number rather than the RBA. The manual also shows execution of the MKTTOOLS tool VLBPAA, which I extensively used 20 years ago. However, it seems that no one has been able to obtain VLBPAA from IBM in recent years. That RBA to CI number change in VSAM likely would make the VLBPAA results slightly inaccurate, too. CICS is an entirely different ballgame. In the rare event that the VSAM files in your shop are still using LSR instead of RLS, then there are opportunities for performance improve by appropriate changes to the FILE and LSRPOOL specifications using Resource Definition Online or, equivalently, via the batch program DFHCSDUP. Never let files with significant activity default to pool 1. Allan On Fri, Jul 7, 2023 at 12:38 AM Jim Mulder <[email protected]> wrote: > That is probably the most recent documentation. I doubt that anything > has been done since I posted this > on IBM-MAIN on Sep 12, 2012: > > > Thanks! I'd already read the book and noted that Dynamic SSI came after > > BLSR. And so the BLSR book might not have been updated. > > I am pretty sure that I submitted a request about 15 years ago > to update the next edition of the Batch LSR manual to say that > SETSSI can be used to active Batch LSR. But it would appear > that there hasn't been a subsequent edition of that book. > (So my request may still be pending somewhere). > > Jim Mulder Batch LSR Developer IBM Corp. Poughkeepsie, NY > > -----Original Message----- > From: IBM Mainframe Discussion List <[email protected]> On Behalf > Of Pommier, Rex > Sent: Thursday, July 6, 2023 3:23 PM > To: [email protected] > Subject: Re: [EXTERNAL] Re: What happened to GC26-1672 Batch Local Shared > Resource(LSR) Documentation? > > Ehhh, I just found my "current" BLSR documentation. GC28-1469 that > somebody already pointed out, MVS/ESA 5.1, June 1994. Guess the old brain > cells are getting foggier than I thought they were. > > Rex > > -----Original Message----- > From: Pommier, Rex > Sent: Thursday, July 6, 2023 2:19 PM > To: 'IBM Mainframe Discussion List' <[email protected]> > Subject: RE: [EXTERNAL] Re: What happened to GC26-1672 Batch Local Shared > Resource(LSR) Documentation? > > I activated BLSR at *current job* a few years back. I had used it very > successfully at prior jobs but nobody here had heard of it. I convinced a > couple of the application teams to try it on some heavy hitters and they > were astonished at the difference. At the time I activated it I thought I > had found a relatively current manual on it but for the life of me I can't > find it now. :-( > > Rex > > ---------------------------------------------------------------------- > 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
