mod_prefork

root     13728  0.0  2.4 226956 12592 ?        Ss   09:06   0:00 /usr/sbin/apache2 -k start
www-data 13731  0.0  5.4 236784 28552 ?        S    09:06   0:00  \_ /usr/sbin/apache2 -k start
www-data 13732  0.0  2.0 228496 10740 ?        S    09:06   0:00  \_ /usr/sbin/apache2 -k start
www-data 13733  0.0 11.3 258912 59700 ?        S    09:06   0:00  \_ /usr/sbin/apache2 -k start
www-data 13734  0.0  1.7 227700  9112 ?        S    09:06   0:00  \_ /usr/sbin/apache2 -k start
www-data 13771  0.0  1.7 227672  9072 ?        S    09:37   0:00  \_ /usr/sbin/apache2 -k start
www-data 13782  0.0  1.7 227564  9012 ?        S    09:39   0:00  \_ /usr/sbin/apache2 -k start
www-data 13823  0.0  1.7 227672  8972 ?        S    09:43   0:00  \_ /usr/sbin/apache2 -k start
www-data 13896  0.0  1.4 226956  7788 ?        S    10:07   0:00  \_ /usr/sbin/apache2 -k start
www-data 13897  0.0  1.4 226956  7788 ?        S    10:07   0:00  \_ /usr/sbin/apache2 -k start
www-data 13898  0.0  1.4 226956  7788 ?        S    10:07   0:00  \_ /usr/sbin/apache2 -k start


----------------------------
mod_worker + fcgi

root     15996  0.0  3.6 122512 19076 ?        Ss   10:27   0:00 /usr/sbin/apache2 -k start
www-data 15997  0.0  0.5 107976  2796 ?        S    10:27   0:00  \_ /usr/sbin/apache2 -k start
www-data 15998  0.0  0.5 120692  2976 ?        S    10:27   0:00  \_ /usr/sbin/apache2 -k start
www-data 15999  0.0  1.4 347992  7560 ?        Sl   10:27   0:00  \_ /usr/sbin/apache2 -k start