> -----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
