Cheryl Watson’s Tuning Letter
A Planet Mainframe Brand
Cheryl’s List #55 – July 17, 2001
1. See You at SHARE! 2. WLM I/O Priority 3. Update to January 2001 CPU Chart 4. Cheryl Watson's TUNING Letter 2001, No. 3 1. See You at SHARE! Next week is SHARE in Minneapolis. I'll be giving my "Hot Flashes" on Friday morning at 9:30am (session 2543). Hope to see you sometime during the week. Please say hello. I tend to go to most of the sessions sponsored by the EWCP project (Enterprise Wide Capacity and Planning), because of their focus on performance. If you haven't considered joining the...
Cheryl’s List #54 – June 6, 2001
1. Java URL Correction 2. New Enclave APAR 3. Cheryl Watson's TUNING Letter 2001, No. 2 1. Java URL Correction Andreas Steinberg noted that our link to the Java DeveloperWorks URL mentioned on page 28 is no longer active. You should use: http://www.ibm.com/developerworks/java. 2. New Enclave APAR Greg Dyck of IBM's z/OS Core Technology Design team points out the following: "APAR OW49428 (open) was just created to correct invalid counts for ASCBTCBS and ASCBTCBE in address spaces that use TCB...
Cheryl’s List #53 – March 30, 2001
1. RMF APAR Correction 2. Cheryl Watson's TUNING Letter 2001, No. 1 1. RMF APAR Correction On page 4 of the 2001, No. 1 newsletter, I mentioned an RMF APAR, OW47563. This was a typo and should have been listed as OW47653. 2. Cheryl Watson's TUNING Letter 2001, No. 1 The forty-four page 2001, No. 1 TUNING Letter was emailed to electronic subscribers on Friday, March 23. The print issues will be probably be mailed out on April 2. Here are a few of the topics we covered. You can purchase a...
Cheryl’s List #52 – March 20, 2001
1. Updates to CPU Chart 2. New Redbook for OS/390 R10 1. Updates to CPU Chart An update to our January 2001 CPU Chart will be sent with our TUNING Letter 2001, No. 1 which will be emailed this week and mailed next week. There are two items: Amdahl updated the service unit per second value for their three Omniflex servers a few months ago, but their Web site wasn't updated until February. See <http://www.amdahl.com/doc/products/compatible/speed_constants/> for their updated list. Thanks...
Cheryl’s List #51 – March 9, 2001
1. zSeries Update 2. Update to High CPU APAR 1. zSeries Update In the last Cheryl's List (#50), I discussed a problem with some types of work that did not achieve their expected capacity when running on a z900 processor. Fortunately, great strides have been made since then. The z900 design change to separate the Data cache and Instruction cache for each CP affected some programs, some quite significantly. The cache line size is 256 bytes. If you modify something within a line that has already...
Cheryl’s List #50 – February 9, 2001
1. zSeries Update 2. January 2001 CPU Chart is Available 3. 1991-2000 CD-ROMs Mailed 1. zSeries Update I've received feedback from two z900 sites who did not receive their expected performance when running SAS-based work (up to 30% less capacity than expected). Another user reported a 13% under-capacity reading on SAS work on the MXG list forum. At least one Natural user is experiencing the same problem. The current surmise, although not confirmed by any parties, is that the change in the...
Cheryl’s List #49 – January 31, 2001
1. zSeries LSPR Updates 2. CPU Chart in Spreadsheet Format! 3. Cheryl Watson's TUNING Letter 2000, No. 6 Summary 4. SHARE in Long Beach 1. zSeries Updates On February 24, IBM updated the LSPR ratings previously published in December. They made the decision to update the ratings after further testing of the new processors. Models 2064-101 to 2064-109 have new performance ratings, new MSUs, and new SU/Second values. These models were downgraded from 0 to 6% from the December ratings. IBM also...
Cheryl’s List #48 – November 29, 2000
1. zSeries Shipments 2. Cheryl Watson's TUNING Letter 2000, No. 5 Summary 1. zSeries Shipments The majority of questions I've received lately are asking whether the zSeries machines have been delayed. There was a news item recently that said that IBM was delaying some shipments of the z900s, expected to be in GA by December 18, 2000. Several people took this to mean that IBM was having problems with the z900 and wasn't able to make the ship dates. IBM (and several of my readers) tell me that...
Cheryl’s List #47 – October 3, 2000
1. IBM's Big Announcement Day 2. Cheryl Watson's TUNING Letter 2000, No. 4 Update 1. IBM's Big Announcement Day This was a big announcement day for IBM as they introduced their new eSeries, consisting of 26 new mainframe processors (the zSeries 900), and several new UNIX, mid-range and Intel-base processors. Highlights of all eSeries processors include higher reliability for e-business work and Capacity Upgrade on Demand (CUoD) features. I'll have a full discussion of the new zSeries in the...
Cheryl’s List #46 – September 30, 2000
1. Cheryl Watson's TUNING Letter 2000, No. 4 Summary The 2000, No. 4 TUNING Letter issue has just being completed. Electronic subscribers should receive their TUNING Letter today. Printed issues should be mailed within a week or two. BoxScore Perhaps the most important item in this issue for managers is the announcement of our software product, BoxScore. If you want to confirm that you've got the machine speed that you've paid for, or if you want to know how much overhead is being incurred by...