Maybe I am confused, but is looks like this move is using .76% of the CPU of
the program. This is less than 1%. What does the section called (AFAIR) most
highly executed procedures look like.
----- Original Message -----
From: "Farley, Peter x23353" <[email protected]>
Newsgroups: bit.listserv.ibm-main
To: <[email protected]>
Sent: Saturday, August 08, 2009 11:28 AM
Subject: Re: z10 and overlapping/destructive moves
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On
Behalf Of Edward Jaffe
Sent: Friday, August 07, 2009 8:22 PM
To: [email protected]
Subject: Re: z10 and overlapping/destructive moves
Farley, Peter x23353 wrote:
> Indeed, that is what I am doing. That COBOL MOVE is the first of 56
> bytes highlighted by Strobe.
It's telling you that a disproportionate number of samples recorded
the
"next to be dispatched" PSW somewhere within those 56 bytes...not on
the
MVC. What do the other 50 bytes of code look like?
Here is the Strobe line from the latest run, which reduced the spike
window to 34 bytes starting at the MVI/MVC:
LINE PROCEDURE STARTING INTERVAL % CPU
TIME
NUMBER NAME LOCATION LENGTH SOLO
TOTAL
6823 MOVE 0033D6 34 .62
.76 .************+++
Here is the generated assembler at that location for 34 bytes:
006823 MOVE
0033D6 9240 30FE MVI 254(3),X'40'
0033DA D276 30FF 30FE MVC 255(119,3),254(3)
006825 EVALUATE
006826 WHEN
0033E0 5820 C034 L 2,52(0,12)
0033E4 D502 30DB 24CA CLC 219(3,3),1226(2)
0033EA 4740 BBC6 BC 4,3014(0,11)
0033EE D502 30DB 24AA CLC 219(3,3),1194(2)
0033F4 47D0 BBE4 BC 13,3044(0,11)
0033F8 GN=1443 EQU *
As you can see, there isn't much here to explain a spike except the
MVI/MVC combination. The EVALUATE/WHEN that follows is comparing a
3-byte field to two literals (a less-than-this or greater-than-that
construct).
Hence my questions on how this MVI/MVC could generate such a spike.
Peter
This message and any attachments are intended only for the use of the
addressee and
may contain information that is privileged and confidential. If the reader
of the
message is not the intended recipient or an authorized representative of
the
intended recipient, you are hereby notified that any dissemination of this
communication is strictly prohibited. If you have received this
communication in
error, please notify us immediately by e-mail and delete the message and
any
attachments from your system.
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: GET IBM-MAIN INFO
Search the archives at http://bama.ua.edu/archives/ibm-main.html
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: GET IBM-MAIN INFO
Search the archives at http://bama.ua.edu/archives/ibm-main.html
