2.1.1 Measurement of Internet services
PFM - Agent for Service Response measures an Internet service's response performance by acquiring data, such as the response times after transmission of requests and the data transfer throughputs. The function that measures an Internet service's response performance is called a probe. PFM - Agent for Service Response can measure an Internet service's response times down to thousandths of a second (3 decimal places).
The following figure provides an overview of measurement of an Internet service by PFM - Agent for Service Response.
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![[Figure]](GRAPHICS/ZUV01002.GIF)
At startup, PFM - Agent for Service Response's Probe Daemon reads the three files listed below. Measurement results for each measurement condition are output to a report file and then collected by Agent Collector at a specified interval.
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Probe action condition definition file (esp.conf)
This file defines startup options, such as the maximum number of measurement conditions for a PFM - Agent for Service Response probe and the maximum size of a report file. For details, see 8.2 Probe action condition definition file (esp.conf).
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Measurement condition registration file (esptask.xml)
This file defines the measurement conditions, such as a target's service type, host name, and measurement interval. You define the measurement conditions in PFM - Web Console (or you can define conditions by editing the measurement condition registration file directly). For details about defining conditions in PFM - Web Console, see 4.7 Defining measurement conditions in PFM - Web Console. For details about measurement condition registration file, see 8.3 Measurement condition registration file (esptask.xml).
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Password file (esp.pdb)
This file registers and manages the passwords needed to log on to a target Internet service. For details, see 4.3.1 Registering passwords.