memmory issue on backup / after

[seba22]

Code:

# free
             total       used       free     shared    buffers     cached
Mem:       1861612    1785584      76028          0     168776    1395908
-/+ buffers/cache:     220900    1640712
Swap:       755012          0     755012
webserver:~#

I see, the problem is in some process !
Not memmory !

Code:

17858 vu2009    25   0 20328 2676  776 R   96  0.1 369:17.28 php5-cgi

Its took 96 % CPU !!!
And this is problem...
PHP5-CGI... what the hell it is..
I'm try to stop apache
/etc/init.d/apache2 stop
/etc/init.d/apache2 start

Not solved...
I'm don't use any script what can take so much CPU...

I can't reboot webserver everyday... :/
Users will kill me...