Review metric measurements

You can review the contents of a history file in a tool window. When you request a tool to display a history file, the onperf utility starts a playback process that reads the data from disk and sends the data to the tool for display.

The playback process is similar to the data-collector process mentioned under Save metric values to a file. However, instead of reading data from shared memory, the playback process reads measurements from a history file. Figure 1 shows the playback process.

Figure 1. Flow of data from a history file to an onperf tool window