Is Apache Web Server Concurrent?


Angela Bailey

Is Apache Web Server Concurrent?

Apache Web Server is one of the most widely used web servers in the world. It is known for its reliability, scalability, and performance.

When it comes to handling multiple requests simultaneously, Apache excels by implementing a concurrent processing model.

Concurrency in Apache Web Server

Concurrency refers to the ability of a web server to handle multiple requests at the same time. In the case of Apache, it uses a process-based model called Multiprocessing Module (MPM) to achieve concurrency.

Multiprocessing Module (MPM)

Apache provides various MPMs that allow you to choose the best one based on your server’s requirements. The two most commonly used MPMs are:

  • Prefork MPM:
  • The Prefork MPM uses a non-threaded model where each request runs on its own process. This model is ideal for stability and isolation but may consume more memory due to process duplication.

  • Worker MPM:
  • The Worker MPM uses a hybrid approach with multiple child processes, each having multiple threads. This model allows for better resource utilization, as threads within a process share memory space.

    It offers improved performance and efficiency compared to Prefork MPM.

Configuring Concurrency in Apache

To configure concurrency settings in Apache, you need to modify the server’s configuration file (httpd.conf). Find the section related to your chosen MPM and adjust the following directives:

  • MaxRequestWorkers:
  • This directive specifies the maximum number of simultaneous client connections that Apache can handle. It determines the level of concurrency. Increase this value to allow more simultaneous connections, but be cautious as it can strain server resources.

    Example: MaxRequestWorkers 150

  • ServerLimit:
  • This directive sets the maximum number of child processes created by Apache. It works in conjunction with MaxRequestWorkers to determine the overall concurrency level.

    Example: ServerLimit 10

  • ThreadsPerChild:
  • This directive specifies the number of threads each child process can create. It affects the amount of memory used by each process.

    Example: ThreadsPerChild 25


Apache Web Server is indeed concurrent, thanks to its MPMs like Prefork and Worker. By utilizing these MPMs and configuring appropriate concurrency settings, you can ensure your server efficiently handles multiple requests simultaneously.

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