Red Hat

[root@server-01 ~]# free -m
             total       used       free     shared    buffers     cached
Mem:          7873       7753        120          0          2        276
-/+ buffers/cache:       7474        399
Swap:        10063       4403       5660
[root@server-01 ~]# vmstat 1 2
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 3  0 4509316 120036   2644 283144   24   15    34    51   24    6  2  1 96  1  0
 4  0 4509296 119912   2644 283304   32    0    32     0 1686 6463  2  0 98  0  0
[root@server-01 ~]#
[root@server-01 ~]# ps aux | awk '{print $2, $4, $11}' | sort -k2r | head -n 10
PID %MEM COMMAND
1913 3.3 /usr/java/jdk1.6.0_31/bin/java
4232 3.3 /usr/java/jdk1.6.0_31/bin/java
2333 2.0 java
3397 1.8 /usr/java/jdk1.6.0_31/bin/java
1784 1.6 postgres:
4230 1.5 /usr/java/jdk1.6.0_31/bin/java
22477 1.3 /usr/java/jdk1.6.0_31/bin/java
3058 1.3 /usr/java/jdk1.6.0_31/bin/java
3995 1.3 /usr/java/jdk1.6.0_31/bin/java
[root@server-01 ~]# top
top - 11:33:32 up 3 days, 23:49,  2 users,  load average: 1.59, 0.51, 0.59
Tasks: 218 total,   1 running, 217 sleeping,   0 stopped,   0 zombie
Cpu(s):  4.5%us,  1.0%sy,  0.0%ni, 24.6%id, 69.7%wa,  0.0%hi,  0.2%si,  0.0%st
Mem:   8062732k total,  7956004k used,   106728k free,     1860k buffers
Swap: 10305528k total,  4508972k used,  5796556k free,   259976k cached