Professional terms for evaluating website performance, professional terms for evaluating performance

Professional terms for evaluating website performance, professional terms for evaluating performance

[Preface]
For O & M personnel, it is important to deploy servers and make them play their best roles. So if you want to evaluate the server quality, you need to know the terminology is not ~
This article is about the terminology used to evaluate the website performance. It is also useful for the server architecture.

1, PV
PV (Page View) refers to the access volume, that is, Page browsing. The specific measurement of PV is to send a Request to the network server from the browser. After the network server receives the Request, it will send a webpage corresponding to the Request to the browser, this generates a PV. As long as the request is sent to the browser, no matter whether the page is fully opened or not, it will be counted as one PV. PV is the number of pages accessed by the website.
For example, when you access a webpage, a request is sent to the server, which is counted as one PV. However, the network speed is slow and the webpage has never been opened, then you press F5 to refresh it. This refresh is also counted as one PV.

2, UV
UV (Unique Visitor) is an independent access. That is, a computer client accessing the website is regarded as a visitor. If it is measured in days, the program will count the number of computer clients in the period from. However, it should be noted that the same client is counted only once. There may be multiple different people using the same computer client to access the same web page, but it is also recorded as a UV. Another thing to note is that in the rice age, everyone seems to be using different IP addresses. In fact, our IP addresses are the same on the Internet. At this time, the statistics are counted as UV.

3. Number of concurrent connections
Through the two introductions above, we have some feelings that the two indicators above have a great error in evaluating the website performance. Therefore, you can evaluate the number of concurrent connections.
When a Web page is browsed, the server establishes a connection with the browser. Each connection indicates a concurrency. If the current webpage page contains many images and the images are not displayed one by one, the server will generate many connections to send text and images at the same time to improve browsing speed. Therefore, the more images on the web page, the more Concurrent Connections (Concurrent TCP Connections) on the server.
Therefore, concurrent connections are generally used as a parameter to measure the performance of a single Web machine.

4. QPS
The QPS (Query Per Second) definition also knows, that is, the amount of traffic that can be processed by a specific Query server within the specified time.
For a system, the QPS value is a very important parameter. It not only reflects the Web response speed, cache, and database content, but also reflects the Comprehensive processing capability of the system.