o  Bottleneck

     Specific areas of an application where the
     performance needs to be improved.

  o  Chart

     The pictorial representations of the data that are
     presented during PCA analysis.

  o  Correlation Table

     A chart that shows the relationship between several
     kinds of data.

  o  Counting

     Collection information about each andevery
     occurrence of some event.

  o  CPU Bound

     Description of a process in which the time spent
     executing code on a processor is greater than the
     time spent performing I/O operations.

  o  Data Item

     Pieces of information that are gathered by the PCA
     Collector and presented by the PCA Analyzer.

  o  Elapsed Time

     Time as measured by a clock or a watch. Elapsed time
     accumulates regardless of the state of the process
     being timed.

  o  Granularity

     The amount of detail presented in a chart. An
     example for increasing granularity is charting a
     set of modules, then the routines in a particular
     module, then the source lines in particular routine.

  o  Histogram

     A chart that graphically presents the frequency of
     data.

  o  I/O Bound

     An I/O bound process is one in which the time spent
     is performing I/O operations is far greater than the
     time spent executing code.

  o  Line

     A generic term for an individual line of source code

  o  Module

     A generic term for a collection of routines. See
     Routine.

  o  Process Time

     Time during which a process is actually running.
     Another name for this is CPU process being
     timestime. Process time increments only when the
     timed is actually running on a CPU. No time is
     accumulated when the process is not running.

  o  Program Element

     A generic term for a component of an application,
     such as a module, routine, line, or statement.

  o  Routine

     A generic term for a function, procedure, routine,
     or subroutine, depending on the programming language
     you are using. See Module.

  o  Query

     A question or inquiry made by the user. For example,
     "How many times were all of the routines in this
     application called?"

  o  Sampling

     The collection os a subset of possible events that
     allow statistical prediction of the outcome of
     collecting information about the entire set.

  o  Sampling Rate

     The time between sampling timer ticks.

  o  Selection

     An item that the user has indicated interest in,
     generally by clicking on the item.

  o  Sort Order

     The order in which a chart is sorted; for
     example, from the largest to the smallest value,
     alphabetically, or not at all.

  o  Table

     A chart that presents values expresses by means
     other than percentages.

  o  Viewpoint

     The perspective from which you observe data. For
     example, if you have collected information about
     the system services used by your application, you
     can look at this system services information from
     the perspective of either where system services were
     used or what those system services are.

  o  Zoom In

     To change a chart to be of a finer granularity.

  o  Zoom Out

     To change a chart to be of broader granularity.