NGINX vs Apache – Everything You Need to Know in 2023

Apache provides a number of multiprocessing modules. These are also called MPMs and they determine how client requests are handled. This allows administrators to switch connection handling architectures simply, quickly and conveniently.

So what are these modules?

mpm prefork

This Apache module spawns a process with one thread to handle each request, and all children can accept one connection at a time. If the amount of requests is less than the amount of processes, this module can achieve very fast performance.

However, if the number of requests exceeds the number of processes, quality can be severely degraded. That said, this module is not always the right option.

Any process that uses this module will also have a large impact on RAM consumption, making effective scaling difficult to achieve. However, it is still a solid choice when used with additional components built without thread consideration. For example, since PHP is not thread safe, this module might be the best way to safely work with mod_php (Apache’s module for handling these specific files).

mpm_worker

Apache’s mpm_worker module is designed to spawn processes that can each manage numerous threads, each handling a single connection. Threads have proven to be more efficient than processes, so this MPM provides more scalability than the modules described above.

Since there are no more threads than processes, a new connection can occupy one of the available threads without waiting for another suitable process to come along.

mpm_event

Apache’s third module can be considered similar to the aforementioned mpm_worker module in most situations, but optimized to accommodate keep-alives. This means that when using the worker module, the connection will keep the thread active for the entire duration that the connection remains active, regardless of whether or not a request was made actively.

Apache’s connection handling architecture provides a great deal of flexibility in selecting different connection and request handling algorithms. The options offered are primarily a result of the continued evolution of servers and the increasing demand for concurrency as the Internet changes dramatically.

Source

Apache provides a number of multiprocessing modules. These are also called MPMs and they determine how client requests are handled. This allows administrators to switch connection handling architectures simply, quickly and conveniently.

So what are these modules?

mpm prefork

This Apache module spawns a process with one thread to handle each request, and all children can accept one connection at a time. If the amount of requests is less than the amount of processes, this module can achieve very fast performance.

However, if the number of requests exceeds the number of processes, quality can be severely degraded. That said, this module is not always the right option.

Any process that uses this module will also have a large impact on RAM consumption, making effective scaling difficult to achieve. However, it is still a solid choice when used with additional components built without thread consideration. For example, since PHP is not thread safe, this module might be the best way to safely work with mod_php (Apache’s module for handling these specific files).

mpm_worker

Apache’s mpm_worker module is designed to spawn processes that can each manage numerous threads, each handling a single connection. Threads have proven to be more efficient than processes, so this MPM provides more scalability than the modules described above.

Since there are no more threads than processes, a new connection can occupy one of the available threads without waiting for another suitable process to come along.

mpm_event

Apache’s third module can be considered similar to the aforementioned mpm_worker module in most situations, but optimized to accommodate keep-alives. This means that when using the worker module, the connection will keep the thread active for the entire duration that the connection remains active, regardless of whether or not a request was made actively.

Apache’s connection handling architecture provides a great deal of flexibility in selecting different connection and request handling algorithms. The options offered are primarily a result of the continued evolution of servers and the increasing demand for concurrency as the Internet changes dramatically.

Source

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