我可以知道超载的问题出在哪里吗？
top - 13:14:12 up 2 days, 20:07, 4 users, load average: 39.30, 38.39, 35.45
Tasks: 1637 total, 1 running, 1636 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.2%us, 0.3%sy, 0.0%ni, 99.4%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 8064172k total, 7670360k used, 393812k free, 241264k buffers
Swap: 4075516k total, 0k used, 4075516k free, 2856200k cached
memory 7875MiB System memory
processor Intel(R) Core(TM) i5-2400 CPU @ 3.10GHz
SO Ubuntu 12.04 LTS amd64
kernel 3.2.0-32-generic x86_64
//settings
vm.swappiness 0
我只安装了 zimbra 8.0.0 大约有 225 个邮箱帐户，平均有 40 个在线帐户。