如何查看进程实际的内存占用情况详解

top命令可以查看进程内存的使用，但是不够详细。还有一些命令可以进行更加详细的查看。

[root@localhost ~]# cat /proc/5606/status
Name:   switch4
State:  S (sleeping)
Tgid:   5606
Pid:    5606
PPid:   1
TracerPid:      0
Uid:    0       0       0       0
Gid:    0       0       0       0
Utrace: 0
FDSize: 32
Groups: 0 1 2 3 4 6 10
VmPeak:    85328 kB
VmSize:    84308 kB——进程占用的虚拟内存大小。
VmLck:         0 kB
VmHWM:     46368 kB
VmRSS:     46360 kB——占用的物理内存。
VmData:    76512 kB——data段内存大小（BSS，data）
VmStk:        88 kB——栈大小。
VmExe:       312 kB——代码段大小。
VmLib:      6868 kB——库大小
VmPTE:       148 kB
VmSwap:        0 kB
Threads:        4
SigQ:   1/31237
SigPnd: 0000000000000000
ShdPnd: 0000000000000000
SigBlk: 0000000000000000
SigIgn: 0000000000000005
SigCgt: 0000000180005202
CapInh: 0000000000000000
CapPrm: ffffffffffffffff
CapEff: ffffffffffffffff
CapBnd: ffffffffffffffff
Cpus_allowed:   ff
Cpus_allowed_list:      0-7
Mems_allowed:   1
Mems_allowed_list:      0
voluntary_ctxt_switches:        116683469
nonvoluntary_ctxt_switches:     301173

[root@localhost ~]# cat /proc/5627/smaps
00110000-00112000 r-xp 00000000 08:02 652817     /home/mic_lib_2012-04-21-03-16-32/libdb.so
Size:                  8 kB
Rss:                   8 kB
Pss:                   1 kB
Shared_Clean:          8 kB
Shared_Dirty:          0 kB
Private_Clean:         0 kB
Private_Dirty:         0 kB
Referenced:            8 kB
Swap:                  0 kB
KernelPageSize:        4 kB
MMUPageSize:           4 kB
00112000-00113000 rw-p 00001000 08:02 652817     /home/mic_lib_2012-04-21-03-16-32/libdb.so
Size:                  4 kB
Rss:                   4 kB
Pss:                   4 kB
Shared_Clean:          0 kB
Shared_Dirty:          0 kB
Private_Clean:         0 kB
Private_Dirty:         4 kB
Referenced:            4 kB
Swap:                  0 kB
KernelPageSize:        4 kB
MMUPageSize:           4 kB
08048000-080a2000 r-xp 00000000 08:02 1044485    /home/execute_2012-04-21-03-16-32/mrfc
Size:                360 kB——虚拟内存
Rss:                 156 kB——物理内存
Pss:                 156 kB
Shared_Clean:          0 kB——共享部分，动态链接库
Shared_Dirty:          0 kB
Private_Clean:       156 kB——私有部分。
Private_Dirty:         0 kB
Referenced:          156 kB
Swap:                  0 kB
KernelPageSize:        4 kB
MMUPageSize:           4 kB
09f43000-09f87000 rw-p 00000000 00:00 0          [heap]——堆的内存
Size:                272 kB
Rss:                 184 kB
Pss:                 184 kB
Shared_Clean:          0 kB
Shared_Dirty:          0 kB
Private_Clean:         0 kB
Private_Dirty:       184 kB
Referenced:          184 kB
Swap:                  0 kB
KernelPageSize:        4 kB
MMUPageSize:           4 kB
b6cfc000-b6cfd000 ---p 00000000 00:00 0
Size:                  4 kB
Rss:                   0 kB
Pss:                   0 kB
Shared_Clean:          0 kB
Shared_Dirty:          0 kB
Private_Clean:         0 kB
Private_Dirty:         0 kB
Referenced:            0 kB
Swap:                  0 kB
KernelPageSize:        4 kB
MMUPageSize:           4 kB
b6cfd000-b7703000 rw-p 00000000 00:00 0
Size:              10264 kB
Rss:                  28 kB
Pss:                  28 kB
Shared_Clean:          0 kB
Shared_Dirty:          0 kB
Private_Clean:         0 kB
Private_Dirty:        28 kB
Referenced:           28 kB
Swap:                  0 kB
KernelPageSize:        4 kB
MMUPageSize:           4 kB
b7714000-b7716000 rw-p 00000000 00:00 0
Size:                  8 kB
Rss:                   8 kB
Pss:                   8 kB
Shared_Clean:          0 kB
Shared_Dirty:          0 kB
Private_Clean:         0 kB
Private_Dirty:         8 kB
Referenced:            8 kB
Swap:                  0 kB
KernelPageSize:        4 kB
MMUPageSize:           4 kB
bfed4000-bfee9000 rw-p 00000000 00:00 0          [stack]——栈的内存。
Size:                 88 kB
Rss:                  44 kB
Pss:                  44 kB
Shared_Clean:          0 kB
Shared_Dirty:          0 kB
Private_Clean:         0 kB
Private_Dirty:        44 kB
Referenced:           44 kB
Swap:                  0 kB
KernelPageSize:        4 kB
MMUPageSize:           4 kB