Linux下查看某个进程占用的CPU、内存

1.查看详细的内存占比

cat /proc/PID/status

eg：寻找hostapd的进程的pid，对当前的pid的进程所占用的内存进行详细查看。

root@ROUTER:~# ps | grep hostapd
 6715 root      1740 S    hostapd -B /etc/hostapd.conf.wlan0
29684 root      1328 S    grep hostapd
root@ROUTER:~# cat /proc/6715/status
Name:    hostapd
State:    S (sleeping)
Tgid:    6715
Ngid:    0
Pid:    6715
PPid:    1
TracerPid:    0
Uid:    0    0    0    0
Gid:    0    0    0    0
FDSize:    32
Groups:    0 
VmPeak:        1740 kB
VmSize:        1740 kB
VmLck:           0 kB
VmPin:           0 kB
VmHWM:         120 kB
VmRSS:         120 kB
VmData:          80 kB
VmStk:         136 kB
VmExe:         720 kB
VmLib:         672 kB
VmPTE:           8 kB
VmPMD:           0 kB
VmSwap:           0 kB
Threads:    1
SigQ:    0/949
SigPnd:    0000000000000000
ShdPnd:    0000000000000000
SigBlk:    0000000000000000
SigIgn:    0000000200001004
SigCgt:    0000000000004203
CapInh:    0000000000000000
CapPrm:    0000003fffffffff
CapEff:    0000003fffffffff
CapBnd:    0000003fffffffff
CapAmb:    0000000000000000
Cpus_allowed:    1
Cpus_allowed_list:    0
voluntary_ctxt_switches:    2598
nonvoluntary_ctxt_switches:    2634

2.

ps -aux命令可以直接查询出 内存比 和 CPU占比，为了验证这个命令查询出来的内存占比和CPU占比是不是准确，我们先从Ubuntu系统上验证一下当前占比是不是准确

ps -aux | grep zookeeper

ps -aux | grep 2181