Apache's MDM module

mpm:multipath processing modules  (Multi-Path Processing module) (1) Prefork: Multi-process model, each process responds to a request; a Master process: responsible for generating child processes and reclaiming child processes ; responsible for creating sockets; responsible for receiving requests and distributing them to a child process for processing;      n subprocess: Each subprocess processes a request;      Work model: Several idle processes are pre-generated and are ready to be used in response to user requests; maximum idle and minimum idle;      (2) Worker: Multi-process multithreaded model with one user request per thread;       a Master process: responsible for generating child processes, responsible for creating sockets, receiving requests, and distributing them to a child process for processing;      Multiple child processes: Each child process is responsible for generating multiple threads;      per thread: Responsible for responding to user requests;      concurrent response number:m*n             m: Number of child processes      N: The maximum number of threads that can be created per subprocess;     (3) Event: Events-driven model, multi-process model, each process responds to multiple requests;     a master process &NBSP;: Responsible for generating child processes; responsible for creating sockets; responsible for receiving requests and distributing them to a child process for processing;     child processes: Respond to multiple requests directly based on an event-driven mechanism;     httpd-2.2:  still uses model;     for testing Httpd-2.4:event can be used in a production environment; httpd-2.2 does not support compiling multiple MPM modules at the same time, so only the one selected to use can be compiled; the centos 6 RPM package specifically provides three application files for this purpose, httpd (PREFORK),  httpd.worker, httpd.event, respectively, to implement support for different MPM mechanisms; Verify which program file is being used now: ps  aux  | &NBSP;GREP&NBSP;HTTPD default for/USR/SBIN/HTTPD, which is Prefork's MPM module  ; view Module list for httpd programs: View statically compiled modules:# httpd   -l viewing statically compiled and dynamically compiled modules: # httpd  -m replacement using HTTPD program to support other MPM mechanisms; vim /etc/sysconfig/httpdhttpd=/ Usr/sbin/httpd. {Worker,event} Note: Restart the service process to take effect with MPM configuration:/etc/httpd/conf/httpd.confprefork configuration <IfModule prefork.c> startservers       8#  server just started is the number of idle processes started minspareservers     5#  minimum number of idle processes maxspareservers   20#  maximum number of idle processes serverlimit       256#  maximum number of processes to start maxclients       256#  The maximum number of processes initiated to respond to client requests. Maximum number of concurrent maxrequestsperchild  4000#  how many requests per process can be processed, up to 4,000 to destroy a process </ifmodule>worker configuration:< ifmodule worker.c>startservers         4#  How many idle processes are started when the server has just started Maxclients         300#  the maximum number of processes initiated to respond to client requests. Maximum number of concurrent minsparethreads     25#  minimum idle processes maxsparethreads      75#  maximum number of idle processes threadsperchild     25#  The maximum number of threads per process can be generated maxrequestsperchild The number of requests processed by the   0#  process is not limited </ifmodule>pv:page view: daily clicks, how many pages are clicked

Apache's MDM module