Apache working mode

Apache 2.2 Compile and install the default is the Prefork mode of operation, if you want to use a different mode of operation with--with-mpm=worker to specify

(1) prefork MPM: Use multiple sub-processes, each child process only one thread to process an HTTP connection, high efficiency, but the memory consumption is relatively large
(2) Worker MPM: Using multiple sub-processes, each child process has multiple threads, can handle a large number of requests, the disadvantage is that if a thread crashes, the entire process will die along with any of its threads
(3) Event MPM: This mode of operation is mainly used for keep-alive Long connection problems, There will be a dedicated thread to manage these keep-alive types of threads

Apache working mode