171 processes after breakdown.

[tears]

My MySQL breakdown 30 mins ago,but there are 171 processes on my Server still.
Why?

10:14pm up 1:00, 2 users, load average: 0.08, 0.04, 0.01
171 processes: 168 sleeping, 2 running, 1 zombie, 0 stopped
CPU states: 0.5% user, 1.5% system, 0.0% nice, 97.8% idle
Mem: 127816K av, 94816K used, 33000K free, 59664K shrd, 3184K buff
Swap: 530136K av, 9768K used, 520368K free 41572K cached

PID USER PRI NI SIZE RSS SHARE STAT LIB %CPU %MEM TIME COMMAND
614 admin 4 0 612 576 316 R 0 1.5 0.4 0:47 top
2717 nobody 0 0 2140 1884 1580 S 0 0.1 1.4 0:00 httpd
1 root 0 0 108 52 36 S 0 0.0 0.0 0:05 init
2 root 0 0 0 0 0 SW 0 0.0 0.0 0:00 kflushd
3 root 0 0 0 0 0 SW 0 0.0 0.0 0:00 kupdate
4 root 0 0 0 0 0 SW 0 0.0 0.0 0:00 kpiod
5 root 0 0 0 0 0 SW 0 0.0 0.0 0:00 kswapd
6 root -20 -20 0 0 0 SW< 0 0.0 0.0 0:00 mdrecoveryd
308 root 0 0 212 160 124 S 0 0.0 0.1 0:00 syslogd
317 root 0 0 412 0 0 SW 0 0.0 0.0 0:00 klogd
331 root 0 0 176 112 68 S 0 0.0 0.0 0:00 crond
345 root 0 0 76 0 0 SW 0 0.0 0.0 0:00 inetd
389 root 0 0 496 268 204 S 0 0.0 0.2 0:00 sendmail
422 root 0 0 152 0 0 SW 0 0.0 0.0 0:00 safe_mysqld
435 root 5 5 8896 4780 1192 S N 0 0.0 3.7 0:00 mysqld
437 root 12 5 8896 4780 1192 S N 0 0.0 3.7 0:00 mysqld
438 root 5 5 8896 4780 1192 S N 0 0.0 3.7 0:00 mysqld