Prism User's Guide - CSAIL People - MIT

Chapter 6. Obtaining Performnance Data 115
Chapter 6._- Obin Pr- D
6.6.3 Anomalous Performance Data
It is possible that your performance data will simply appear incorrect. For example,
you may get percentages in the thousands or millions.
This problem can occur if you try to use timers that Prism has allocated for its
own use. If you use more than five timers in your program, be sure to set the
environment variable CMPROF N USIRTIEs to the number that you use; see
Section 6.2.1.
6.7 Saving and Loading Performance Data Files
You can save performance data you have collected for a program in a file; you
can later load this file into Prism and re-display the data. This lets you look at
the progression of performance analyses as you work on your program. It is also
useful if you do your original data collection outside of Prism or in commandsonly
Prism, and later want to look at your data in the graphical version.
Follow this procedure:
1. Collect the data as you normally do (that is, turn collection on and run
the program to completion).
2. Choose Save Data from the Performance Menu. (Alternatively, you
can choose Display Data from the Performance menu to display the
Performance Data window, then choose Save Data from the File menu
in this window.)
A dialog box appears; in it, specify the name of the file in which you
want to save the data. If you don't supply a complete pathname, the filename
is interpreted relative to the directory from which you started
Prism. The data is then saved in this file.
Alternatively, you can issue the perfsave command from the command
window, specifying the name of the file in which the data is to be
saved.
3. When you want to look at the data again, choose Load Data from the
Performance menu (or from the File menu in the Performance Data
window). A file-selection dialog box is displayed, from which you
choose the file in which you saved the data. The data is then reloaded.
Version 1.2 March 1993
Copyright © 1993 Tinking Machines Corporation