Re: ECTG usage
>Therefore, using ECTG when you're not in an disabled >state during the entire timing process will not produce the results you >want. That is not correct. ECTG was created specifically to avoid the need for disablement. (Pretty much all other time-related things do need disablement.) Having said that, the correct operands for ECTG are not part of the programming interface. Therefore use of ECTG is intended for the operating system only, and access to ECTG is provided by the TIMEUSED macro (check out its ECT keyword) Peter Relson z/OS Core Technology Design -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: ECTG usage
> I'm trying to benchmark cputime (under CICS) with pieces of code I'm > changing, ECTG before and ECTG after. I'm zeroing out operand 1 > before the ECTG thus I get a negative value in GPR0(because ETCG > subtracts the operand 1 with the timer value) after I'm doing a LCR > of GPR0 to get the positive timer value. If the cputimer went > negative during the test (timer interrupt), the second ECTG is > higher than the 1st one and since I don't know the "refeed" value of > the CPUTIMER, I can't tell how much cputime was spend. I know I > could use CICS internal values or statistics) but since they made > ECTG as non-privilege I figured I'd give it a try. So... I'm missing > something in the concept (the refeed value and how many times the > interrupt occured ?) We don't intend for you to code the ECTG instruction yourself. We intend for you to use the TIMEUSED macro with LINKAGE=BRANCH and ECT=SYSTEM | COND | YES before and after the code you are measuring. Jim Mulder z/OS System Test IBM Corp. Poughkeepsie, NY -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: ECTG usage
The management of the CPU timer is completely in the realm of the dispatcher/scheduler. Therefore, using ECTG when you're not in an disabled state during the entire timing process will not produce the results you want. I have always used TIMEUSED to get CPU time. It's been many years since I've had a need for TIMEUSED and it has certainly changed. It appears ECTG was written to improve its performance. Kenneth -Original Message- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Richard Verville Sent: Thursday, July 25, 2013 8:47 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: ECTG usage I'm trying to benchmark cputime (under CICS) with pieces of code I'm changing, ECTG before and ECTG after. I'm zeroing out operand 1 before the ECTG thus I get a negative value in GPR0(because ETCG subtracts the operand 1 with the timer value) after I'm doing a LCR of GPR0 to get the positive timer value. If the cputimer went negative during the test (timer interrupt), the second ECTG is higher than the 1st one and since I don't know the "refeed" value of the CPUTIMER, I can't tell how much cputime was spend. I know I could use CICS internal values or statistics) but since they made ECTG as non-privilege I figured I'd give it a try. So... I'm missing something in the concept (the refeed value and how many times the interrupt occured ?) Richard -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
ECTG usage
I'm trying to benchmark cputime (under CICS) with pieces of code I'm changing, ECTG before and ECTG after. I'm zeroing out operand 1 before the ECTG thus I get a negative value in GPR0(because ETCG subtracts the operand 1 with the timer value) after I'm doing a LCR of GPR0 to get the positive timer value. If the cputimer went negative during the test (timer interrupt), the second ECTG is higher than the 1st one and since I don't know the "refeed" value of the CPUTIMER, I can't tell how much cputime was spend. I know I could use CICS internal values or statistics) but since they made ECTG as non-privilege I figured I'd give it a try. So... I'm missing something in the concept (the refeed value and how many times the interrupt occured ?) Richard -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
