Each child process run with more threads than ThreadsPerChild setting in Apache httpd worker MPM

Solution Unverified - Updated -

Issue

When I monitored a number of thread for each child process in Apache httpd worker MPM with

ps -efL | grep <Apache_Child_PID>

or

ps aux -L | grep <Apache_Child_PID>

It shows more number of threads than ThreadsPerChild setting. What are the extra threads?

Environment

  • Apache httpd 2.2, 2.4
  • worker MPM

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