That's what you actually get on PowerPc as an assembly opcode when you ask for a NO-OP (no operation). Takes time on the processor but does nothing. Sometimes when working with embedded hardware we used them for timing loops.
There were stories in the '80's and early '90s of software vendors embedding extra NO-OPs so they could remove them later in a future release as an enhancement. So today when a vendor tells me they increased the performance and gives no details, my mind goes straight to assembly NO-OP opcode removal :-)
Coy Krill
Core Processing Team Lead
Washington Trust Bank
-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Rob Berendt
Sent: Wednesday, April 24, 2019 12:03
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: RE: 7.4: "In this release, IBM Db2® for i is focused on improving ... performance of SQL as well as ... "
Importance: Low
Ok, I like technical humor but I admit that sometimes it can whoosh by. Don't ask me how long it took me to find the humor in "Mother's board, Dad's Unix".
Can you explain
ori 0,0,0
?
-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Krill, Coy
Sent: Wednesday, April 24, 2019 2:56 PM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: RE: 7.4: "In this release, IBM Db2® for i is focused on improving ... performance of SQL as well as ... "
Can't you just trust that they removed a couple of these embedded in some loops and that sped things up?
ori 0,0,0
:-)
Coy Krill
Core Processing Team Lead
Washington Trust Bank
-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Rob Berendt
Sent: Wednesday, April 24, 2019 11:48
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: 7.4: "In this release, IBM Db2® for i is focused on improving ... performance of SQL as well as ... "
Importance: Low
I was asked about this from my boss. Working closely with him I can guess he’s thinking stuff like:
How did they improve performance of SQL? Did they do something along the lines of:
- SQE vs CQE?
- SQL Plan cache?
- SQL optimizer?
- what?
So I did some research and I find ONE item listed in “Db2 for i - Performance Enhancements”. And that item is: “IASP vary on performance is improved”. Now this may be a big thing for some of you but we really don’t find it applicable to our operations.
Is there something else I am missing in how 7.4 improved the performance of SQL?
Bibliography
https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki/IBM%20i%20Technology%20Updates/page/IBM%20i%207.4%20-%20Base%20Enhancements
https://www-01.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/4/897/ENUS219-214/index.html&request_locale=en
Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1 Group Dekko Dept 1600 Mail to: 2505 Dekko Drive
Garrett, IN 46738
Ship to: Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com
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