通过proc/procid/status查看进程内存

piky@piky-WRT-WX9:~/src/test$ cat /proc/3118/status 
Name:	a.out
Umask:	0002
State:	S (sleeping)
Tgid:	3118
Ngid:	0
Pid:	3118
PPid:	1832
TracerPid:	0
Uid:	1000	1000	1000	1000
Gid:	1000	1000	1000	1000
FDSize:	256
Groups:	4 24 27 30 46 107 122 131 132 1000 
NStgid:	3118
NSpid:	3118
NSpgid:	3118
NSsid:	1832
VmPeak:	   33160 kB    //峰值内存        
VmSize:	   33160 kB    //进程虚拟地址空间大小
VmLck:	       0 kB
VmPin:	       0 kB
VmHWM:	   31900 kB     //正在使用的物理内存大小
VmRSS:	   31900 kB
RssAnon:	   30652 kB
RssFile:	    1248 kB
RssShmem:	       0 kB
VmData:	   29976 kB     //进程数据段大小
VmStk:	    1016 kB     //用户态栈大小
VmExe:	       4 kB     // 代码段大小
VmLib:	    1616 kB     // 库映射到虚拟内存空间的大小
VmPTE:	     104 kB     // 进程页表大小
VmSwap:	       0 kB
HugetlbPages:	       0 kB
CoreDumping:	0
THP_enabled:	1
Threads:	1
SigQ:	0/30527
SigPnd:	0000000000000000
ShdPnd:	0000000000000000
SigBlk:	0000000000000000
SigIgn:	0000000000000000
SigCgt:	0000000000000000
CapInh:	0000000000000000
CapPrm:	0000000000000000
CapEff:	0000000000000000
CapBnd:	000001ffffffffff
CapAmb:	0000000000000000
NoNewPrivs:	0
Seccomp:	0
Seccomp_filters:	0
Speculation_Store_Bypass:	thread vulnerable
SpeculationIndirectBranch:	conditional enabled
Cpus_allowed:	ff
Cpus_allowed_list:	0-7
Mems_allowed:	00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000001
Mems_allowed_list:	0
voluntary_ctxt_switches:	775
nonvoluntary_ctxt_switches:	1

通过smaps查看内存

piky@piky-WRT-WX9:~/src/test$ cat /proc/3118/smaps | grep '^Pss:' | awk '{sum += $2} END {print sum}'
30879

通过ps查看

piky@piky-WRT-WX9:~/src/test$ ps -aux | grep a.out
piky        3118  0.0  0.4  33160 31900 pts/0    S+   20:01   0:00 ./a.out-----进程内存

查看整机内存

piky@piky-WRT-WX9:~/src/test$ cat /proc/meminfo 
MemTotal:        7882088 kB  
MemFree:         4413984 kB
MemAvailable:    6254932 kB
Buffers:           62028 kB
Cached:          2279764 kB
SwapCached:            0 kB
Active:          1007364 kB
Inactive:        1897292 kB
Active(anon):       2100 kB
Inactive(anon):   877468 kB
Active(file):    1005264 kB
Inactive(file):  1019824 kB
Unevictable:      289624 kB
Mlocked:              64 kB
SwapTotal:      15999996 kB
SwapFree:       15999996 kB
Dirty:                 8 kB
Writeback:             0 kB
AnonPages:        852580 kB
Mapped:           407612 kB
Shmem:            316708 kB
KReclaimable:      82808 kB
Slab:             168188 kB
SReclaimable:      82808 kB
SUnreclaim:        85380 kB
KernelStack:        9184 kB
PageTables:        21644 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:    19941040 kB
Committed_AS:    4914756 kB
VmallocTotal:   34359738367 kB
VmallocUsed:       34800 kB
VmallocChunk:          0 kB
Percpu:             6784 kB
HardwareCorrupted:     0 kB
AnonHugePages:         0 kB
ShmemHugePages:        0 kB
ShmemPmdMapped:        0 kB
FileHugePages:         0 kB
FilePmdMapped:         0 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
Hugetlb:               0 kB
DirectMap4k:      215740 kB
DirectMap2M:     5822464 kB
DirectMap1G:     3145728 kB