Timing calculations

Monitors attempt to divide the time taken to complete a poll into different timed stages. For example, this could include the time taken to obtain a host's IP address, or the time taken to successfully connect to a host.

Figure 1 shows an example of the times measured by the HTTP monitor.

Figure 1. HTTP timing calculation example 

The $totalTime is always slightly longer than the sum of the other times, because it includes the overhead incurred by the monitor's activities such as processing received data and performing system calls. $totalTime is measured in seconds.