で、
http://qb5.2ch.net/test/read.cgi/operate/1140540754/993
> 1 と 2048 だと、Apache がちゃんと増えないみたい。

ですが、

pid 32740 (httpd), uid 2001: exited on signal 11
pid 32741 (httpd), uid 2001: exited on signal 11
pid 32742 (httpd), uid 2001: exited on signal 11
pid 32743 (httpd), uid 2001: exited on signal 11
pid 32745 (httpd), uid 2001: exited on signal 11
pid 32746 (httpd), uid 2001: exited on signal 11
pid 32763 (httpd), uid 2001: exited on signal 11
...

となっていた模様。