Memory usage up 105% on mediatemple
===

Three hours ago the server memory usage blowed up to 105% from around 60%.I am using a dedicated MediaTemple server with 512mb RAM.Should I be worried?Why would something like this happen?

Any help would be greatly appreciated.


    Tasks:  38 total,   2 running,  36 sleeping,   0 stopped,   0 zombie
    Cpu(s):  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
    Mem:    946344k total,   550344k used,   396000k free,        0k buffers
    Swap:        0k total,        0k used,        0k free,        0k cached
    
      PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
        1 root      15   0 10364  740  620 S  0.0  0.1   0:38.54 init
     3212 root      18   0 96620 4068 3200 R  0.0  0.4   0:00.21 sshd
     3214 root      15   0 12080 1728 1316 S  0.0  0.2   0:00.05 bash
     3267 apache    15   0  412m  43m 4396 S  0.0  4.7   0:03.88 httpd
     3290 apache    15   0  412m  43m 4340 S  0.0  4.7   0:02.98 httpd
     3348 root      15   0  114m  52m 2112 S  0.0  5.6   0:48.94 spamd
     3349 popuser   15   0  114m  50m  972 S  0.0  5.5   0:00.06 spamd
     3455 sw-cp-se  18   0 60116 3216 1408 S  0.0  0.3   0:00.12 sw-cp-serverd
     3525 admin     18   0 81572 4604 2912 S  0.0  0.5   0:01.74 in.proftpd
     3585 apache    18   0  379m  15m 3356 S  0.0  1.7   0:00.01 httpd
     3589 root      15   0 12624 1224  956 R  0.0  0.1   0:00.00 top
     7397 root      15   0 21660  944  712 S  0.0  0.1   0:00.58 xinetd
     9500 named     16   0  301m 5284 1968 S  0.0  0.6   0:00.43 named
     9575 root      15  -4 12632  680  356 S  0.0  0.1   0:00.00 udevd
     9788 root      25   0 13184  608  472 S  0.0  0.1   0:00.00 couriertcpd
     9790 root      25   0  3672  380  312 S  0.0  0.0   0:00.00 courierlogger
     9798 root      25   0 13184  608  472 S  0.0  0.1   0:00.00 couriertcpd

