[squid-users] question in cache mem in squid 3

hi ,
i have a question
i have a server with 48 G of rams ,
in squid.conf file ive served mem for squid to be only 1 G

but my question is why is my total memory is get full after sometime ??

result is below from my server :
====================================================
root_at_drvirus:~# free -m
             total used free shared buffers cached
Mem: 48296 47853 442 0 1893 38302
-/+ buffers/cache: 7658 40638
Swap: 0 0 0
root_at_drvirus:~# cat /etc/squid3/squid.conf | grep cache_mem
cache_mem 1000 MB
==========================================================

as we see , the free memory is just 442 M and ive just configured memory 1 g
for squid , and also i only use my system for squid , so i dont tink that
other processess other than squid is eating my memory !!

here is output of the command top :
top

/top - 14:35:06 up 2 days, 22:58, 2 users, load average: 3.04, 2.25, 1.90
Tasks: 190 total, 1 running, 188 sleeping, 0 stopped, 1 zombie
Cpu(s): 5.2%us, 9.7%sy, 0.0%ni, 77.4%id, 4.3%wa, 0.0%hi, 3.4%si,
0.0%st
Mem: 49455732k total, 49092852k used, 362880k free, 1898256k buffers
Swap: 0k total, 0k used, 0k free, 39341964k cached

  PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
 2936 proxy 20 0 4950m 4.8g 2244 D 81 10.1 3025:47 squid3
15837 proxy 20 0 305m 171m 2532 S 78 0.4 43:02.94 python
 2417 mysql 20 0 449m 61m 2724 S 7 0.1 208:01.06 mysqld
27535 proxy 20 0 148m 14m 2336 S 6 0.0 30:21.52 python
27536 proxy 20 0 147m 14m 2336 S 3 0.0 22:03.57 python
27542 proxy 20 0 147m 13m 2336 S 2 0.0 9:32.79 python
27539 proxy 20 0 147m 14m 2336 S 1 0.0 15:19.15 python
27549 proxy 20 0 148m 14m 2336 S 1 0.0 6:03.95 python
   15 root 20 0 0 0 0 S 1 0.0 35:56.55 ksoftirqd/2
   23 root 20 0 0 0 0 S 1 0.0 35:43.95 ksoftirqd/4
   31 root 20 0 0 0 0 S 1 0.0 35:04.29 ksoftirqd/6
   39 root 20 0 0 0 0 S 1 0.0 32:19.42 ksoftirqd/8
   55 root 20 0 0 0 0 S 1 0.0 32:55.90 ksoftirqd/12
   63 root 20 0 0 0 0 S 1 0.0 32:21.44 ksoftirqd/14
16225 proxy 20 0 3952 272 208 S 1 0.0 1:02.64 tail
27598 proxy 20 0 147m 13m 2344 S 1 0.0 3:35.83 python
    3 root 20 0 0 0 0 S 1 0.0 19:24.87 ksoftirqd/0
   47 root 20 0 0 0 0 S 1 0.0 34:32.83 ksoftirqd/10
 2862 root 20 0 0 0 0 S 1 0.0 2:39.92 flush-8:0
27601 proxy 20 0 147m 16m 2336 S 1 0.0 2:19.74 python
28405 www-data 20 0 1208m 3912 1072 S 1 0.0 0:01.67 apache2
   10 root 20 0 0 0 0 S 0 0.0 10:42.76 ksoftirqd/1
   19 root 20 0 0 0 0 S 0 0.0 10:58.87 ksoftirqd/3
   27 root 20 0 0 0 0 S 0 0.0 11:02.36 ksoftirqd/5
   35 root 20 0 0 0 0 S 0 0.0 11:21.07 ksoftirqd/7
   51 root 20 0 0 0 0 S 0 0.0 10:35.43 ksoftirqd/11
   59 root 20 0 0 0 0 S 0 0.0 5:56.19 ksoftirqd/13
   67 root 20 0 0 0 0 S 0 0.0 5:03.22 ksoftirqd/15
  542 root 20 0 0 0 0 S 0 0.0 13:25.53 kswapd0
  543 root 20 0 0 0 0 S 0 0.0 8:02.43 kswapd1
 2866 root 20 0 0 0 0 S 0 0.0 6:52.55 flush-8:48
 2867 root 20 0 0 0 0 S 0 0.0 8:07.08 flush-8:80
 8141 www-data 20 0 1145m 4092 1136 S 0 0.0 0:03.23 apache2
 9990 root 20 0 0 0 0 S 0 0.0 2:38.96 kworker/0:2
20502 www-data 20 0 1145m 5172 1152 S 0 0.0 0:10.88 apache2
27604 proxy 20 0 147m 13m 2336 S 0 0.0 1:27.98 python
30424 www-data 20 0 1145m 5124 1344 S 0 0.0 0:10.37 apache2
    1 root 20 0 8404 760 624 S 0 0.0 0:03.01 init
    2 root 20 0 0 0 0 S 0 0.0 0:00.00 kthreadd
    5 root 20 0 0 0 0 S 0 0.0 0:04.12 kworker/u:0 /

wish to clarify

regards

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