JOB CPU TIME VS MIPS VS EXECUTION TIME

5 pts.
Tags:
cpu speed
IBM Z9
z/OS 1.9
Hi,

This is almost the same question, but asked in a different way..

I have a JOB that always uses say 100 CPU seconds & running by itself will run for say 10min (clock).

All things being equal, if I run the same JOB on a mainframe with twice as many MIPS, would the execution (clock) time be half as long (ie 5 min)??



Software/Hardware used:
Z/OS 1.9 (IBM Z9)
ASKED: January 25, 2012  5:42 AM
UPDATED: February 7, 2012  2:53 PM

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  • TomLiotta
    All things being equal,... All things being equal other than ptocessor speed being twice as fast, I would start by expecting it to finish in maybe 9 minutes and 10 seconds, probably less. Since the CPU time accounts for at least 100 seconds of the 10 minutes (600 seconds) that it takes to run, there are still 500 seconds to account for. Those seconds are probably from disk accesses, network delays, and perhaps many other things. "All things being equal", those additional things haven't changed. Tom
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