查看某个进程运行时间的几种方法

1.首先查出某个进程的pid，然后使用ps命令

[root@hadoop1 ~]# jps
2640 Jps
2339 DataNode
2239 NameNode
[root@hadoop1 ~]# ps -p 2239 -o etime
    ELAPSED
      02:47

2.先输出所有进程的信息，然后查找某个进程

[root@hadoop1 ~]# ps -eo etime,cmd | grep NameNode
      10:23 /root/softs/jdk1.8.0_172/bin/java -Dproc_namenode -Xmx1000m -Djava.net.preferIPv4Stack=true -Dhadoop.log.dir=/root/softs/hadoop-2.7.3/logs -Dhadoop.log.file=hadoop.log -Dhadoop.home.dir=/root/softs/hadoop-2.7.3 -Dhadoop.id.str=root -Dhadoop.root.logger=INFO,console -Djava.library.path=/root/softs/hadoop-2.7.3/lib/native -Dhadoop.policy.file=hadoop-policy.xml -Djava.net.preferIPv4Stack=true -Djava.net.preferIPv4Stack=true -Djava.net.preferIPv4Stack=true -Dhadoop.log.dir=/root/softs/hadoop-2.7.3/logs -Dhadoop.log.file=hadoop-root-namenode-hadoop1.log -Dhadoop.home.dir=/root/softs/hadoop-2.7.3 -Dhadoop.id.str=root -Dhadoop.root.logger=INFO,RFA -Djava.library.path=/root/softs/hadoop-2.7.3/lib/native -Dhadoop.policy.file=hadoop-policy.xml -Djava.net.preferIPv4Stack=true -Dhadoop.security.logger=INFO,RFAS -Dhdfs.audit.logger=INFO,NullAppender -Dhadoop.security.logger=INFO,RFAS -Dhdfs.audit.logger=INFO,NullAppender -Dhadoop.security.logger=INFO,RFAS -Dhdfs.audit.logger=INFO,NullAppender -Dhadoop.security.logger=INFO,RFAS org.apache.hadoop.hdfs.server.namenode.NameNode