History: UserPagepdf

I got memory leak with tikiwiki, why?

last pid: 14715; load averages: 0.00, 0.00, 0.00 up 1+21:23:28 09:50:06
172 processes: 1 running, 171 sleeping
CPU states: 0.4% user, 0.0% nice, 0.0% system, 0.0% interrupt, 99.6% idle
Mem: 662M Active, 288M Inact, 32M Wired, 22M Cache, 8345K Buf, 2236K Free
Swap: 1498M Total, 650M Used, 848M Free, 43% Inuse

PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU COMMAND
6095 root 2 0 1748K 480K select 2:55 0.00% 0.00% top
412 root 2 0 12808K 2496K poll 1:38 0.00% 0.00% mysqld
419 root 2 0 1684K 388K select 0:23 0.00% 0.00% sshd2
8005 nobody 2 0 17444K 752K accept 0:11 0.00% 0.00% httpd
8003 nobody 2 0 17448K 720K accept 0:10 0.00% 0.00% httpd
8001 nobody 2 0 17444K 740K accept 0:10 0.00% 0.00% httpd
6457 root 2 0 3248K 1400K select 0:09 0.00% 0.00% httpd
7999 nobody 2 0 17456K 15992K accept 0:09 0.00% 0.00% httpd
7996 nobody 2 0 17448K 14840K accept 0:09 0.00% 0.00% httpd
6495 nobody 2 0 17496K 0K accept 0:09 0.00% 0.00% httpd
6485 nobody 2 0 17364K 0K accept 0:09 0.00% 0.00% httpd
6483 nobody 2 0 17372K 0K accept 0:08 0.00% 0.00% httpd
8006 nobody 2 0 17448K 15984K accept 0:08 0.00% 0.00% httpd
7993 nobody 2 0 17448K 768K accept 0:08 0.00% 0.00% httpd
7992 nobody 2 0 17388K 712K accept 0:07 0.00% 0.00% httpd
6514 nobody 2 0 17700K 0K accept 0:07 0.00% 0.00% httpd
6486 nobody 2 0 17368K 0K accept 0:06 0.00% 0.00% httpd
7995 nobody 2 0 17448K 792K accept 0:06 0.00% 0.00% httpd
6804 nobody 2 0 17384K 736K accept 0:06 0.00% 0.00% httpd
8004 nobody 2 0 17204K 15904K accept 0:06 0.00% 0.00% httpd
8002 nobody 2 0 17492K 14856K accept 0:06 0.00% 0.00% httpd
6521 nobody 2 0 17352K 0K accept 0:05 0.00% 0.00% httpd
6467 nobody 2 0 16012K 0K accept 0:05 0.00% 0.00% httpd
6500 nobody 2 0 17236K 0K accept 0:05 0.00% 0.00% httpd
6520 nobody 2 0 17288K 0K accept 0:05 0.00% 0.00% httpd
6490 nobody 2 0 17488K 0K accept 0:05 0.00% 0.00% httpd
12298 nobody 2 0 17092K 15776K accept 0:05 0.00% 0.00% httpd
351 root 10 0 812K 208K nanslp 0:05 0.00% 0.00% svscan
6517 nobody 2 0 17332K 0K accept 0:05 0.00% 0.00% httpd
7998 nobody 2 0 17100K 15800K accept 0:05 0.00% 0.00% httpd
6524 nobody 2 0 15852K 0K accept 0:04 0.00% 0.00% httpd
6494 nobody 2 0 17064K 0K accept 0:04 0.00% 0.00% httpd
6525 nobody 2 0 17520K 0K accept 0:04 0.00% 0.00% httpd
6807 nobody 2 0 17384K 736K accept 0:04 0.00% 0.00% httpd
6498 nobody 2 0 17248K 0K accept 0:04 0.00% 0.00% httpd
6507 nobody 2 0 17164K 0K accept 0:04 0.00% 0.00% httpd
12297 nobody 2 0 17344K 740K accept 0:04 0.00% 0.00% httpd
6534 nobody 2 0 16512K 660K accept 0:04 0.00% 0.00% httpd
6459 nobody 2 0 17368K 0K accept 0:04 0.00% 0.00% httpd
12300 nobody 2 0 15860K 14508K accept 0:04 0.00% 0.00% httpd
6489 nobody 2 0 15832K 0K accept 0:03 0.00% 0.00% httpd
6523 nobody 2 0 16952K 0K accept 0:03 0.00% 0.00% httpd
7997 nobody 2 0 15700K 14356K accept 0:03 0.00% 0.00% httpd
6482 nobody 2 0 17804K 0K accept 0:03 0.00% 0.00% httpd