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To: DECSYSTEM-20 Sites
From: Dan Murphy
Subj: FRIDAY - Performance Analysis Tool
Date: 30 August 1978
FRIDAY is a performance analysis program similar to WATCH
but providing more detailed job-specific information. We
expect that it will help us to better understand and analyze
customer job loads so as to tune the system for most
satisfactory performance. The program is being included on
the Release 3A tapes as an unsupported and undocumented
program. We would like to have any interested sites
field-test the program and to forward the output to us so
that we may evaluate the effectiveness of the data.
We do not expect customer sites to try to analyze the output
at this time; hence we are not providing a comprehensive
expanation of the report. Such a document would be quite
large and may become obsolete as we evolve the program. We
do expect to provide such documentation as part of the
complete analysis package at the completion of this project.
FRIDAY is identical to WATCH in its operation except that
the job under which it runs must be an enabled WHEEL. This
is required because FRIDAY uses the SNOOP JSYS to gather
The following is a typical startup dialog:
FRIDAY 3A(1), /H for help.
Output to file: FRIDAY.LOG.1 !New file!
Print monitor statistics? Y
Print job summary ? Y
Time period (MM:SS): 1
WATCH IN OPERATION --
There will be a pause of several seconds (longer under load)
after the time period is entered and before the following
message is printed. Note that (as with WATCH) the
information is appended to the specified output file. Type
^C and RESET to terminate running of the program.
During the field test of this product, we would like you to
do the following:
1. Run FRIDAY during periods that you consider normal loads
with normal response times. Use a 1 minute period,
and record data for 15-30 minutes.
2. Run FRIDAY during periods when performance is
unsatisfactory, again with 1 minute intervals for
3. Print the log files and forward the output to us with any
pertinent comments. Note that FRIDAY generates
132-column wide output.
Mail the results to:
Digital Equipment Corporation
MR 1-2 / E37
200 Forest Street
Marlborough, Massachusetts 01752
Thank you for your cooperation.