What does it mean that there is an iIS concurrency in the web host description?

The number of IIS concurrent connections refers to the first request to the server, and then the CSS, JS, **, etc. in this web page, each request is counted as an IIS concurrent number, so IIS is theoretically divided into several program situations.

There are several situations: (take 50 people in 100m space as an example) The user single-clicks ** your files, and disconnects them normally after the end, these connections are calculated according to instants, that is, your 50 people** can accept 50 points at the same time**; The user opens your page, even if it stays on the page and does not make any requests to the server, then within 15 minutes after the user opens one side, it must be counted as one**, that is, your 50 people**15 minutes can accept different users to open 50 pages In the case of b above, the user continues to open the same **other pages, then**The number of people is calculated according to the 15 minutes after the last click (request) of the user, In this 15 minutes, no matter how much the user clicks (including the opening of a new window), it is still one person**. When you have an iframe in your page, you need to double the number of frames for each additional frame!

Because this is equivalent to the user requesting multiple pages to the server at the same time. When the user opens the page and then closes the browser normally, the number of users will be cleared immediately. Then understand what the number of people in the forum is.

Forum** simply counts the number of active users over a certain period of time. The time here can be set by the user himself (delete the time of inactive users), and the default of the dynamic network forum is a relatively accurate value of 40 minutes. According to the above explanation, it is obvious that the concept of the number of connections in the forum ** and IIS is different For example, your **20IIS, there is an error message that there are too many IIS connections, and at this time your forum only shows 10 people** (assuming the **time is set to 20 minutes), then the correct explanation should be:

There are 20 connections to visit your, of which 10 are normal access to the forum.

1. Traffic limit.

It is to directly limit network traffic, which is usually the most severe kind of traffic limit, and the traffic of 10 G roughly supports 50 people**. After the monthly traffic is exceeded, it cannot be accessed normally within a month**, and the solution is to upgrade the space or increase the traffic!

2. CPU limit.

CPU limit seems to have no limit IIS or network traffic, but because each program runs requires a certain CPU quota, it is also a disguised traffic limit, usually too much web page display ** is caused by the CPU limit is too small! Temporary normal operation can be obtained after a refresh or 15 seconds, and usually 1% of the CPU limit is equivalent to 20 IIS connections! This is important for the forum space, and once the CPU limit of the forum is too small, it will not function properly!

Three: IIS limitations.

IIS limit is the most used now, and it is also recognized by most users or hosts, and it is the only loose traffic limit, usually 20 IIS is equivalent to 1% CPU occupation!

For now. The best interpretive software to support running is definitely IIS.

The server version has unlimited IIS connections (this can be seen in the Performance tab). However, the performance of IIS concurrent connections depends on a number of aspects. Generally, the overall can be divided into two aspects: hardware and software (note that the XP version of IIS has a limit on the number of connections.)

It seems to be 10 of them).

First, the hardware should be good enough. The higher the CPU and memory configuration, the better (depending on other hardware, network card, motherboard, etc.).

Second, your **, when you make the page. Minimize pop-ups. Anti-hotlinking, try to use as few plug-ins, do not use frame pages, and of course, preventing multi-threading is also one of the important reasons.

What does the number of IIS connections mean by the number of concurrent connections?

b When a user opens your page, even if he stays on the page and does not make any requests to the server, then within 15 minutes after the user opens the side, it must be counted as a **, that is, your 50 people** can accept 50 pages opened by different users within 15 minutes.

c In the case of B above, the user continues to open other pages of the same **, then the number of ** is calculated according to the 15 minutes after the last click (making the request) of the user, and no matter how the user clicks (including the opening of a new window) in this 15 minutes, it is still one person**.

d When you have frames in your pages, you need to double the number of frames for each additional frame! Because this is equivalent to the user requesting multiple pages to the server at the same time.

It mainly depends on the configuration and bandwidth of the server, and IIS itself does not have an upper limit on the number of connections.

By default, the maximum concurrency is 5000