We upgraded from z/os v1.11 to v1.13 on our z10 about 2 weeks ago. Ops reported
that all batch jobs are taking longer 'wall' time. Researching the cause, we
Looked at job step termination stats. We discovered that, on z/os v1.13, all
steps are reporting about 50 times the number of service units as were reported
on z/os v1.11. While TCB & SRB cpu times seem equivalent (no dramatic increase
on v1.13), the elapsed time has increased roughly by a factor of 2 and the
"SERV" value is dramatically higher for each step. A job that took 30 mins now
takes 75 mins. We first thought it may be a problem unique to SORT (SyncSort)
but even the Control-R step (as well as non-sort steps in other jobs) is 30x
higher.
We have opened a PMR with IBM, but I thought I would see if anyone else has
observed anything like this when migrating from z/os v1.11 to v1.13, or may
have some idea where to look for an explanation. Our service coefficients have
not changed. Any comments would be welcome.
From WLM (same on v1.11 and v1.13):
***** begin WLM screen paste *****
Enter or change the Service Coefficients:
CPU . . . . . . . . . . . . . 1.0 (0.0-99.9)
IOC . . . . . . . . . . . . . 0.5 (0.0-99.9)
MSO . . . . . . . . . . . . . 0.0001 (0.0000-99.9999)
SRB . . . . . . . . . . . . . 1.0 (0.0-99.9)
Enter or change the service definition options:
I/O priority management . . . . . . . . YES (Yes or No)
Dynamic alias tuning management . . . . YES (Yes or No)
***** end of WLM screen paste ********
Job run on z/os v1.13:
01.37.16 JOB05818 ---- THURSDAY, 26 JUL 2012 ----
01.37.16 JOB05818 ICH70001I CTMPUSR LAST ACCESS AT 01:37:14 ON THURSDAY, JULY
26, 2012
01.37.16 JOB05818 $HASP373 PR#2500 STARTED - INIT 4 - CLASS T - SYS SYSP
01.37.16 JOB05818 IEF403I PR#2500 - STARTED - TIME=01.37.16
01.37.18 JOB05818 - -----TIMINGS
(MINS.)------ -----PAGING COUNTS----
01.37.18 JOB05818 -STEPNAME PROCSTEP RC EXCP CONN TCB SRB
CLOCK SERV WORKLOAD PAGE SWAP VIO SWAPS
01.37.18 JOB05818 -NONCAT2 CONTROLR 00 597 617 .00 .00
.0 3306 BATPRD 0 0 0 0
01.37.19 JOB05818 -PR#2500 STEP00 00 37 32 .00 .00
.0 82 BATPRD 0 0 0 0
01.37.21 JOB05818 -PR#2500 SORT01 00 1436 501 .00 .00
.0 24350 BATPRD 0 0 0 0
01.37.24 JOB05818 -PR#2500 SORT02 00 2656 947 .00 .00
.0 44752 BATPRD 0 0 0 0
01.37.25 JOB05818 -PR#2500 SORT03 00 462 163 .00 .00
.0 27606 BATPRD 0 0 0 0
01.37.28 JOB05818 -PR#2500 SORT04 00 1400 512 .02 .00
.0 130652 BATPRD 0 0 0 0
01.38.03 JOB05818 -PR#2500 SORT05 00 17075 6394 .26 .01
.5 7699795 BATPRD 0 0 0 0
02.53.03 JOB05818 -PR#2500 STEP05 00 961K 313K .67 .09
74.9 2173651 BATPRD 0 0 0 0
02.53.03 JOB05818 IEF404I PR#2500 - ENDED - TIME=02.53.03
02.53.03 JOB05818 -PR#2500 ENDED. NAME- TOTAL TCB CPU
TIME= .98 TOTAL ELAPSED TIME= 75.7
*********** end of job step stats **************
Same Job run on z/os v1.11:
01.45.41 JOB02442 ---- FRIDAY, 13 JUL 2012 ----
01.45.41 JOB02442 ICH70001I CTMPUSR LAST ACCESS AT 01:45:41 ON FRIDAY, JULY
13, 2012
01.45.41 JOB02442 $HASP373 PR#2500 STARTED - INIT 31 - CLASS T - SYS SYSP
01.45.41 JOB02442 IEF403I PR#2500 - STARTED - TIME=01.45.41
01.45.45 JOB02442 - -----TIMINGS
(MINS.)------ -----PAGING COUNTS----
01.45.45 JOB02442 -STEPNAME PROCSTEP RC EXCP CONN TCB SRB
CLOCK SERV WORKLOAD PAGE SWAP VIO SWAPS
01.45.45 JOB02442 -NONCAT2 CONTROLR 00 599 470 .00 .00
.0 127 BATPRD 0 0 0 0
01.45.47 JOB02442 -PR#2500 STEP00 00 47 38 .00 .00
.0 BATPRD 0 0 0 0
01.45.55 JOB02442 -PR#2500 SORT01 00 1558 619 .00 .00
.1 6845 BATPRD 0 0 0 0
01.46.01 JOB02442 -PR#2500 SORT02 00 2885 1058 .00 .00
.1 12080 BATPRD 0 0 0 0
01.46.09 JOB02442 -PR#2500 SORT03 00 496 186 .00 .00
.1 218 BATPRD 0 0 0 0
01.46.29 JOB02442 -PR#2500 SORT04 00 1518 614 .02 .00
.3 621 BATPRD 0 0 0 0
01.50.18 JOB02442 -PR#2500 SORT05 00 18893 7856 .30 .00
3.8 8114 BATPRD 0 0 0 0
02.18.29 JOB02442 -PR#2500 STEP05 00 1066K 370K .68 .08
28.1 150650 BATPRD 0 0 0 0
02.18.29 JOB02442 IEF404I PR#2500 - ENDED - TIME=02.18.29
02.18.29 JOB02442 -PR#2500 ENDED. NAME- TOTAL TCB CPU
TIME= 1.03 TOTAL ELAPSED TIME= 32.7
Sorry for the lack of formatting here.
TIA,
-Jim
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