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This Apache 2.2 configuration

<IfModule mpm_worker_module>
    StartServers          1
    ServerLimit           1
    MaxClients           60
    MinSpareThreads      25
    MaxSpareThreads      60
    ThreadsPerChild      60


    1 89112 root           /Library/Apache2Front/bin/httpd -k start
89112 89115 _www           /Library/Apache2Front/bin/httpd -k start
89112 89117 _www           /Library/Apache2Front/bin/httpd -k start

1 process (root) and 2 processes (www)

Why 2 processes?

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I can't reproduce this. On OS X with MPM it only has one 'server' process: _www 18807 0.0 0.0 2438108 604 ?? S 1:03AM 0:00.00 /usr/sbin/httpd -D FOREGROUND -D WEBSHARING_ON root 18805 0.0 0.1 2438108 4352 ?? Ss 1:03AM 0:00.20 /usr/sbin/httpd -D FOREGROUND -D WEBSHARING_ON –  polynomial Aug 18 '11 at 8:07
Thanks for testing it. –  sive Aug 20 '11 at 10:11

1 Answer 1

Solved! By setting in httpd.conf LogLevel debug

Killing one of the www processes sh-3.2# ps ax | grep httpd 390 ?? Ss 0:00.11 /Library/Apache2Front/bin/httpd -k restart 391 ?? S 0:00.00 /Library/Apache2Front/bin/httpd -k restart 392 ?? S 0:00.00 /Library/Apache2Front/bin/httpd -k restart 439 s002 R+ 0:00.00 grep httpd sh-3.2# kill 391

[Sat Aug 20 12:09:03 2011] [error] cgid daemon process died, restarting

And from the Apache 2.0 manual On certain unix operating systems, forking a process from a multi-threaded server is a very expensive operation because the new process will replicate all the threads of the parent process. In order to avoid incurring this expense on each CGI invocation, mod_cgid creates an external daemon that is responsible for forking child processes to run CGI scripts.

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