Linux下查看某个进程占用的CPU、内存

1、用top命令指定固定的PID

top -p 10997

查询指定进程的PID

ps -ef | grep zookeeper

jim      10997  1959  0 12月14 pts/2  00:00:01 /usr/lib/jvm/java-8-oracle/bin/java -Dzookeeper.log.dir=. -Dzookeeper.root.logger=INFO,CONSOLE -cp /home/jim/opt/zookeeper-3.4.9/bin/../build/classes:/home/jim/opt/zookeeper-3.4.9/bin/../build/lib/*.jar:/home/jim/opt/zookeeper-3.4.9/bin/../lib/slf4j-log4j12-1.6.1.jar:/home/jim/opt/zookeeper-3.4.9/bin/../lib/slf4j-api-1.6.1.jar:/home/jim/opt/zookeeper-3.4.9/bin/../lib/netty-3.10.5.Final.jar:/home/jim/opt/zookeeper-3.4.9/bin/../lib/log4j-1.2.16.jar:/home/jim/opt/zookeeper-3.4.9/bin/../lib/jline-0.9.94.jar:/home/jim/opt/zookeeper-3.4.9/bin/../zookeeper-3.4.9.jar:/home/jim/opt/zookeeper-3.4.9/bin/../src/java/lib/*.jar:/home/jim/opt/zookeeper-3.4.9/bin/../conf: -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.local.only=false org.apache.zookeeper.server.quorum.QuorumPeerMain /home/jim/opt/zookeeper-3.4.9/bin/../conf/zoo.cfg

2、使用ps查询指定进程名或者PID的占用情况

ps -aux | grep zookeeper

ps -aux | grep 2181

jim      10997  0.0  0.1 11522940 65176 pts/2  Sl   12月14   0:01 /usr/lib/jvm/java-8-oracle/bin/java -Dzookeeper.log.dir=. -Dzookeeper.root.logger=INFO,CONSOLE -cp /home/jim/opt/zookeeper-3.4.9/bin/../build/classes:/home/jim/opt/zookeeper-3.4.9/bin/../build/lib/*.jar:/home/jim/opt/zookeeper-3.4.9/bin/../lib/slf4j-log4j12-1.6.1.jar:/home/jim/opt/zookeeper-3.4.9/bin/../lib/slf4j-api-1.6.1.jar:/home/jim/opt/zookeeper-3.4.9/bin/../lib/netty-3.10.5.Final.jar:/home/jim/opt/zookeeper-3.4.9/bin/../lib/log4j-1.2.16.jar:/home/jim/opt/zookeeper-3.4.9/bin/../lib/jline-0.9.94.jar:/home/jim/opt/zookeeper-3.4.9/bin/../zookeeper-3.4.9.jar:/home/jim/opt/zookeeper-3.4.9/bin/../src/java/lib/*.jar:/home/jim/opt/zookeeper-3.4.9/bin/../conf: -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.local.only=false org.apache.zookeeper.server.quorum.QuorumPeerMain /home/jim/opt/zookeeper-3.4.9/bin/../conf/zoo.cfg

10997为PID

0.0为CPU占用百分比（注意：如果有两个CPU，32核64线程，那么总占比是6400%）

0.1为内存占用百分比

3、查看更详细的内存占比

cat /proc/10997/status

Name:    java
State:    S (sleeping)
Tgid:    10997
Ngid:    0
Pid:    10997
PPid:    1959
TracerPid:    0
Uid:    1000    1000    1000    1000
Gid:    1000    1000    1000    1000
FDSize:    256
Groups:    4 24 27 30 46 113 128 130 132 134 1000 1002 
NStgid:    10997
NSpid:    10997
NSpgid:    10987
NSsid:    10914
VmPeak:    11522940 kB
VmSize:    11522940 kB
VmLck:           0 kB
VmPin:           0 kB
VmHWM:       65176 kB
VmRSS:       65176 kB
VmData:    11462972 kB
VmStk:         140 kB
VmExe:           4 kB
VmLib:       17064 kB
VmPTE:         460 kB
VmPMD:          28 kB
VmSwap:           0 kB
HugetlbPages:           0 kB
Threads:    25
SigQ:    0/128292
SigPnd:    0000000000000000
ShdPnd:    0000000000000000
SigBlk:    0000000000000000
SigIgn:    0000000000000003
SigCgt:    2000000181005ccc
CapInh:    0000000000000000
CapPrm:    0000000000000000
CapEff:    0000000000000000
CapBnd:    0000003fffffffff
CapAmb:    0000000000000000
Seccomp:    0
Cpus_allowed:    ff
Cpus_allowed_list:    0-7
Mems_allowed:    00000000,00000001
Mems_allowed_list:    0
voluntary_ctxt_switches:    86
nonvoluntary_ctxt_switches:    2

VmRSS为内存