查看JAVA占用CPU高的线程日志

# . 查看主进程占用cpu高
top
#     java

# . 按照线程占用cpu由高到低进行排查：
ps -mp  -o THREAD,tid,time | sort -rn |head -

# USER     %CPU PRI SCNT WCHAN  USER SYSTEM   TID     TIME
# root      1.6   -    - -         -      -     - ::
# root      0.1      - futex_    -      -   ::
# root      0.1      - futex_    -      -   ::
# root      0.1      - futex_    -      -   ::
# root      0.0      - skb_re    -      -   ::

# . 将线程号转化为16进制：
printf "%x\n"
6e7

# . 通过主进程搜索所有的线程执行的内容
#    注意点:
#        项目运行的用户
#        使用的jdk版本下的jstack去查看
flag="0x"
sudo -u root /opt/jdk1..0_191/bin/jstack  |grep ${flag}6e7 -A 

### 将整个流程写成脚本，查找tomcat占用CPU高的线程日志
pid=$(ps -ef|grep tomcat|grep -v grep|awk '{print $2}'|head -)
flag="0x"
jstack="/opt/jdk1.8.0_191/bin/jstack"
for tpid in `ps -mp ${pid} -o THREAD,tid,time | sort -rn |head -|awk '$8 ~ /[0-9]+/ {print $8}'`
do
    tpid_16hex=$(printf "%x\n" ${tpid})
    echo "------------------------------------- tpid:[ ${tpid} ] -----------------------------------------------------"
    sudo -u root ${jstack} ${pid} |grep ${flag}${tpid_16hex} -A
done