Refresh Rate |
Specifies how frequently Tivoli Performance Viewer collects
performance data for a server from the Performance Monitoring Infrastructure
(PMI) service provided by that server. The default is 30 seconds.
To collect performance data for the server more frequently, set the
refresh rate to a smaller number. To collect performance data less
frequently, set the refresh rate to a larger number. The allowed range
is 5 to 500 seconds.
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Buffer Size |
Specifies the number of entries to be stored for a server.
Data displayed in Tivoli Performance Viewer is stored in a short in-memory
buffer. After the buffer is full, each time a new entry is retrieved
the oldest entry is discarded. The default buffer size is 40 entries.
Supported values are 10, 20, 30, 40, 50, 60, 70, 80, 90 and 100. The
larger the buffer size, the more memory is consumed. Thus, specify
a buffer size that allows you capture enough monitoring data for analysis
without wasting memory storing unneeded data. |
View Data As |
Specifies how counter values are displayed. Viewing options
include the following:
- Raw Value
- Displays the absolute value. If the counter represents load data,
such as the average number of connections in a database pool, then
Tivoli Performance Viewer displays the current value followed by the
average. For example, 18 (avg:5).
- Change in Value
- Displays the change in the current value from the previous value.
- Rate of Change
- Displays the ratio change/(T1 - T2), where change is
the change in the current value from the previous value, T1 is
the time when the current value was retrieved, and T2 is the
time when the previous value was retrieved.
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The refresh rate and buffer size settings combine
to control how much temporal history you have for the application
server. The default values for Refresh Rate (30 seconds) and Buffer
Size (40 entries) provide you with a 20-minute history of the
application server's performance. Changing one of these parameters
affects the length of the temporal history.