Prism User's Guide - CSAIL People - MIT

116 Prism User Guide
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If no program is loaded at the time, Prism loads the corresponding
executable program; if another program is loaded, Prism displays a dialog
box and asks if you want to load the program associated with the
performance data. If you don't, the usefulness of the performance data
will be limited, since Prism will incorrectly associate the data with the
procedures and source lines of the program that is loaded.
Alternatively, you can issue the perfload command from the command
window, specifying the name of the file in which the data was
saved.
Note these points in saving and loading performance data:
* The performance data is associated with a specific version of the program.
If you modify the program, Prism will not be able to load the version for
which the data was collected. (It prints a warning when it detects that its
performance data file is out of date.) Therefore, if you want to use this
feature to maintain a historical record of your attempts at improving a program's
performance, you should rename the program whenever you
change it, and save the earlier versions along with their performance data
files.
* You can display only one set of performance data at a time within Prism.
Therefore, if you want to compare data from different versions of a program
on-screen, you have to run multiple instances of Prism.
Version 1.2, March 1993
Copyright CD 1993 Thinking Machines Corporation
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