6. Metrics to Measure Web Service Performance

In this section, we introduce a set of metrics and the ways to compute them in order to measure a web service efficiency. These metrics can be categorized as:

• metrics approximating the end-to-end response time observed by the client for a web page download. Additionally, we provide a means to calculate the breakdown between server processing and networking portions of overall response time.
• metrics evaluating the caching efficiency for a given web page by computing the server file hit ratio and server byte hit ratio for the web page.
• metrics relating the end-to-end performance of aborted web pages to the QoS.