MPM

• MPM starts the server process and maps incoming requests onto an execution primitive
• MPM model configured at build time with ./configure –-with-mpm
• Prefork MPM
  • Very robust
  • Least scalable
  • Same as Apache 1 on Unix
  • Good for sites with third-party nontrusted modules
• worker MPM
  • Multi-threaded multi-process pthread server
  • Initial version of a hybrid model for Unix
  • Preforks a specified nr. of processes. Each of these processes creates a specific nr. of threads to serve the requests
  • Nr. of threads per process is static
• perchild MPM
  • Creates a specific nr. of processes
  • Each process creates a pool of threads to handle requests
  • The size of the pool grows and shrinks to accommodate the requests
  • The most scalable MPM for Unix
• mpm_winnt
  • single control process which launches a single child process which in turn creates threads to handle requests
• mpm_netware
• mpm_os2
• mpm_beos