Shulou(Shulou.com)06/02 Report--

CGI (Common Gateway Interface) is a standard protocol that supports communication between an application and a Web browser. CGI first appeared in 1993, and all versions of IIS provide support for CGI. When CGI is run on IIS, there are some problems with the way CGI handles requests. For each new request processed by a CGI application, IIS must create a new process, wait for the process to finish executing, and then close it. IIS can process requests quickly, but the overhead of starting and stopping processes can be a performance bottleneck, which is a problem with how CGI handles requests when running on IIS. IIS introduced FastCGI. FastCGI can partially solve the above performance bottlenecks.

FastCGI (C:\Windows\System32\inetsrv\iisfcgi.dll) is a new version of CGI that satisfies most of the original CGI specifications. FastCGI, however, does not shut down a process when the request has been processed, but rather keeps the process running and processing other requests. FastCGI is single-threaded like CGI, but when FastCGI is used, the server can handle more requests than CGI because the process is still open. In IIS 7.0, FastCGI is implemented using built-in APIs and implemented as a native module.

Why use FastCGI? This is because there are still a large number of PHP applications that are widely used. Although these applications often use CGI or ISAPI versions of PHP, FastCGI can further improve the performance of these applications.

Because FastCGI is a single-threaded application, multiple threads must be started to handle multiple requests. These processes can be grouped into a process pool and grouped into different process groups so that these process groups can be managed in a unified manner. Properties of a process group can be managed, for example, the number of processes in a process group and the number of requests a process can process before recycling are properties of a process group and can be managed. A process group can contain multiple processes, FastCGI can also run multiple process groups at the same time, and each process group can have its own settings.

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