Cheryl Watson’s Tuning Letter
Cheryl’s List #57 – October 4, 2001
As we said in our newsletter, the events of September 11th shocked and saddened us all. Our hearts and minds are with all those affected. Some of our readers in the Middle East have written to remind us that the terrorists do not represent their faith of Islam. We understand, and we hope that our government's response will be measured and precise, bringing those responsible to justice without further loss of innocent life. 1. Corrections 2. Cheryl Watson's TUNING Letter 2001, No. 4 1....
Cheryl’s List #56 – August 16, 2001
1. z/OS Correction 2. Cheryl Watson's TUNING Letter 2001, No. 3 1. z/OS Correction Thanks to Kent Ramsay of webMethods, Inc. for pointing out two typos in this issue of the TUNING Letter. (Note - these corrections were made to the print copy, but did not make it into the email copy.) On page 3, "Elsewhere in the Issue", the last release for compat mode is z/OS 1.2, not OS/390 1.2. On page 17, (third bullet) the reference to OS/390 V1R3 should be z/OS V1R3. 2. Cheryl Watson's TUNING Letter...
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 Java URL Correction Andreas Steinberg noted that our link to the Java DeveloperWorks URL mentioned on page 28 is no longer active.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...