java服务cpu飙到100%如何快速定位

#!/bin/bash

if [ $# -ne 1 ]; then
    echo "Usage: $0 <java-pid>"
    exit 1
fi

pid=$1

# 创建临时文件存储top信息
top_file=$(mktemp)
trap 'rm -f $top_file' EXIT

# 获取进程信息并排序，找出CPU使用率最高的线程
top -b -n 1 -Hp $pid > $top_file

# 获取CPU占用最高的线程信息
thread_info=$(grep java $top_file | sort -k9rn | head -1)
thread_pid=$(echo $thread_info | awk '{print $1}')
cpu_usage=$(echo $thread_info | awk '{print $9}')
thread_hex=$(printf "%x\n" $thread_pid)

echo "==== CPU Usage Information ===="
echo "Thread PID: $thread_pid"
echo "Thread PID (Hex): 0x$thread_hex"
echo "CPU Usage: $cpu_usage%"
echo ""

echo "==== Stack Trace Information ===="
# 检查jstack命令是否存在
if ! command -v jstack &> /dev/null; then
    echo "Error: jstack command not found"
    exit p
fi

# 获取对应线程的堆栈信息
jstack $pid | grep -A 30 "nid=0x$thread_hex"