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- Date: Fri, 24 Jul 1992 14:28:22 BST
- Reply-To: "Mike Froggatt" <MJF@IBM-B.RUTHERFORD.AC.UK>
- Sender: "SAS(r) Discussion" <SAS-L@UGA.BITNET>
- From: "Mike Froggatt" <MJF@IBM-B.RUTHERFORD.AC.UK>
- Subject: Using SAS for CPE - related question
- Lines: 37
-
- Apologies to the list as this is not directly a SAS question but
- we use SAS for Computer Performance evaluation (I have tried CPELIST-L
- with no response, SAS-L is always a useful source of information)
- and the question is
- related to statistical techniques so here goes:
-
- o-o-o-o-o-o-o-o-o-o-o-o
-
- I am concerned about our current techniques for presenting
- statistics on batch job turnround information for our mainframe
- services. Currently we take a fairly simple approach and quote
- things like:
-
- average time spent waiting in queues by job class
- average expansion factors (that is, runtime/cpu)
- 80th percentiles for queue, run times
- (ie 80% of total CPU was done by jobs having an expansion factor <=6)
-
- The advantage of such numbers are that they are easy to quote and understand
- to our management and users.
-
- The disadvantage is that they can also be very misleading, averages
- are simple but do not give indications to variability in the underlying
- data. A suggestion made is to parameterise the data and follow trends
- based on these statistics.
-
- My question is: can anyone pass on useful techiques that they use to
- report on their job turnround or give pointers to references on the topic.
-
- For the record, our performance data for our mainframe services
- is in SAS under VM/CMS
-
- Any suggestions greatly appreciated.
-
- Mike Froggatt, Marketing Services Group
- Rutherford Appleton Laboratory
- Didcot, Oxford, England
-