1.
http://blog.csdn.net/caihaijiang/article/details/6084325 jps、jinfo、jstat、jstack、jmap、jconsole等命令
问题：查看耗时cpu进程中线程方法1
1.jps 查看进程pid
2.top -Hp 进程pid
输出找出time列时间最长的线程id
3.printf "%x\n" 线程pid号 （转换成16进制输出） > 十六进制id
[sk@x-online001 ~]$ printf "%x\n" 7387
1cdb
[ymsk@x--001 ~]$ jstack pid |grep 1cdb
Attaching to remote server pid, please wait...
Error attaching to remote server: java.rmi.UnknownHostException: Unknown host: pid; nested exception is:
java.net.UnknownHostException: pid
4.jstack pid |grep 十六进制id
jstack 7064 > jstack1113 查找十六进制出现地方既是异常问题点
查看线程cpu高方法二：
29746 jps 进程
pidstat -p 29746 -t 1 5 查看占用cpu比较高的线程id号2628
jstack 29746 > jstack03.txt 将线程dump信息写入文件jstack03.txt, 然后将2628十六进制的线程数：97C 为79C为查询条件，到jstack03.txt文件中查找到nid= 97C的线程，该线程即为消耗CPU多的线程
cpu 比较高
top - 19:58:32 up 97 days, 3:07, 1 user, load average: 1.00, 1.02, 0.93
Tasks: 89 total, 1 running, 88 sleeping, 0 stopped, 0 zombie
Cpu(s): 99.3%us, 0.7%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 2054216k total, 1978800k used, 75416k free, 81644k buffers
Swap: 0k total, 0k used, 0k free, 1076048k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
20466 ymsk 20 0 2152m 575m 7744 S 99.2 28.7 226:14.68 java