top - 22:29:19 up 251 days, 8:03, 10 users, load average: 3.04, 3.03, 2.77
Tasks: 213 total, 4 running, 209 sleeping, 0 stopped, 0 zombie
Cpu(s): 36.9%us, 0.0%sy, 0.0%ni, 63.0%id, 0.1%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 10485760k total, 10414272k used, 71488k free, 18728k buffers
Swap: 1048568k total, 1048568k used, 0k free, 8712336k cached
free+buffers+cached为可用内存。