Sorry guys
I realized that the table have lost their format then I resend them and I hope
this will enhances the readability
Jobchain On Z14 with ZCOMP:
JOBNAME Step CPU SRB
Count Min. Min.
PSDRB101 142 26.56 0.58
PSDRB102 142 26.34 0.58
PSDRB103 142 25.7 0.56
PSDRB104 142 25.6 0.56
PSDRB105 142 25.63 0.58
PSDRB106 142 25.4 0.53
PSDRB107 142 25.81 0.54
PSDRB108 142 25.84 0.54
PSDRB109 141 25.35 0.53
PSDRB110 141 25.21 0.52
PSDRB111 141 25.58 0.55
PSDRB112 141 25.7 0.54
PSDRB113 141 25.66 0.6
PSDRB114 141 25.77 0.57
PSDRB115 141 25.96 0.57
PSDRB116 141 26.03 0.6
PSDRB117 141 26.36 0.6
PSDRB118 141 26.94 0.62
PSDRB119 141 26.72 0.62
PSDRB120 141 26.51 0.6
PSDRB121 141 26.8 0.59
PSDRB122 141 26.34 0.58
PSDRB123 141 25.87 0.54
PSDRB124 141 25.21 0.5
PSDRB125 141 25.64 0.55
PSDRB126 141 26.2 0.56
PSDRB127 141 26.41 0.6
PSDRB128 141 26.06 0.55
PSDRB129 141 26.63 0.59
PSDRB130 141 26.62 0.61
Totale 4238 780.45 17.06
Jobchain on Z15 with ZCOMP:
JOBNAME Step CPU SRB
Count Min. Min.
PSDRB101 143 54.64 2.29
PSDRB102 143 55.02 2.38
PSDRB103 143 54.21 2.24
PSDRB104 143 54.55 2.32
PSDRB105 143 54.97 2.34
PSDRB106 143 54.41 2.34
PSDRB107 143 53.98 2.26
PSDRB108 143 54.54 2.32
PSDRB109 143 54.81 2.39
PSDRB110 143 54.46 2.3
PSDRB111 142 53.6 2.29
PSDRB112 142 53.68 2.28
PSDRB113 142 52.73 2.28
PSDRB114 142 52.99 2.25
PSDRB115 142 54.31 2.35
PSDRB116 142 54.89 2.38
PSDRB117 142 54.97 2.43
PSDRB118 142 54.77 2.37
PSDRB119 142 55.12 2.44
PSDRB120 142 54.81 2.37
PSDRB121 142 53.84 2.33
PSDRB122 142 54.72 2.37
PSDRB123 142 55.38 2.41
PSDRB124 142 54.15 2.32
PSDRB125 142 54.83 2.34
PSDRB126 142 54.41 2.35
PSDRB127 142 54.5 2.27
PSDRB128 142 55.06 2.35
PSDRB129 142 54.3 2.28
PSDRB130 142 54.52 2.22
Total 4270 1633.17 69.86
As we can see :
1. We built dynamically 30 jobs per days with 141/142/143 steps each
one (1 step → 1 DASD dumped)
2. We had some more steps on the second run because the numbers of DASD
devices has increased meanwhile;
3. The CPU consumption is equivalent per job on each job chain (it
means that the content of the DASD didn’t influence the CPU utilization: do you
agree?)
4. In total on Z15 we used the CP for (1633.17 +69.86) minutes and on
Z14 for (780.45+17.06) minutes the difference is 905 minutes → more than 15h of
1 CP per day! This is an huge increase (especially if you pay the SW fee based
on the total CPU utilization)!
5. We relieved this behavior only for the DUMP with DFDSS by using
ZCOMP DISK to TAPE (not for the compression on DISK via dataclass for example)
6. We relieved on Z15 an elapsed time reduction and maybe also in the
compression ratio has been reduced but this is not the point I raised up . The
point is that on Z15 we experienced more CPU consumption and IBM said:
"The Integrated Accelerator for zEDC, available with IBM(r) z15(tm) ...,
reduces the cost of storing, transporting and processing data. It replaces the
zEDC Express adapter with on-chip compression, providing increased throughput
and capacity: for the z15, up to 8 times faster application elapsed time with
no additional CPU time compared to a z14 with zEDC Express for compression and
decompression (cfr
https://www.ibm.com/support/z-content-solutions/compression/)"
Unfortunately I do not have the Z14 anymore and I can’t do further tests.
Ciao
Renato
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: INFO IBM-MAIN
