线上服务 CPU 100%？一键定位 so easy！

source <(curl -fsSL https://raw.githubusercontent.com/oldratlee/useful-scripts/master/test-cases/self-installer.sh)

import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;


public class RegexLoad {
    public static void main(String[] args) {
        String[] patternMatch = {"([\\w\\s]+)+([+\\-/*])+([\\w\\s]+)",
                "([\\w\\s]+)+([+\\-/*])+([\\w\\s]+)+([+\\-/*])+([\\w\\s]+)"};
        List<String> patternList = new ArrayList<String>();

        patternList.add("Avg Volume Units product A + Volume Units product A");
        patternList.add("Avg Volume Units /  Volume Units product A");
        patternList.add("Avg retailer On Hand / Volume Units Plan / Store Count");
        patternList.add("Avg Hand Volume Units Plan Store Count");
        patternList.add("1 - Avg merchant Volume Units");
        patternList.add("Total retailer shipment Count");

        for (String s :patternList ){

            for(int i=0;i<patternMatch.length;i++){
                Pattern pattern = Pattern.compile(patternMatch[i]);

                Matcher matcher = pattern.matcher(s);
                System.out.println(s);
                if (matcher.matches()) {

                    System.out.println("Passed");
                }else
                    System.out.println("Failed;");
            }

        }
    }
}

work@dev_zz_Master 10.48.186.32 23:45:50 ~/demo >
bash show-busy-java-threads.sh
[1] Busy(96.2%) thread(8577/0x2181) stack of java process(8576) under user(work):
"main" prio=10 tid=0x00007f0c64006800 nid=0x2181 runnable [0x00007f0c6a64a000]
   java.lang.Thread.State: RUNNABLE
        at java.util.regex.Pattern$GroupHead.match(Pattern.java:4168)
        at java.util.regex.Pattern$Loop.match(Pattern.java:4295)
        ...
        at java.util.regex.Matcher.match(Matcher.java:1127)
        at java.util.regex.Matcher.matches(Matcher.java:502)
        at RegexLoad.main(RegexLoad.java:27)

[2] Busy(1.5%) thread(8591/0x218f) stack of java process(8576) under user(work):
"C2 CompilerThread1" daemon prio=10 tid=0x00007f0c64095800 nid=0x218f waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

[3] Busy(0.8%) thread(8590/0x218e) stack of java process(8576) under user(work):
"C2 CompilerThread0" daemon prio=10 tid=0x00007f0c64093000 nid=0x218e waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

[4] Busy(0.2%) thread(8593/0x2191) stack of java process(8576) under user(work):
"VM Periodic Task Thread" prio=10 tid=0x00007f0c640a2800 nid=0x2191 waiting on condition 

[5] Busy(0.1%) thread(25159/0x6247) stack of java process(25137) under user(work):
"VM Periodic Task Thread" prio=10 tid=0x00007f13340b4000 nid=0x6247 waiting on condition 
work@dev_zz_Master 10.48.186.32 23:46:04 ~/demo >

import java.util.*;
public class SimpleDeadLock extends Thread {
    public static Object l1 = new Object();
    public static Object l2 = new Object();
    private int index;
    public static void main(String[] a) {
        Thread t1 = new Thread1();
        Thread t2 = new Thread2();
        t1.start();
        t2.start();
    }
    private static class Thread1 extends Thread {
        public void run() {
            synchronized (l1) {
                System.out.println("Thread 1: Holding lock 1...");
                try { Thread.sleep(10); }
                catch (InterruptedException e) {}
                System.out.println("Thread 1: Waiting for lock 2...");
                synchronized (l2) {
                    System.out.println("Thread 2: Holding lock 1 & 2...");
                }
            }
        }
    }
    private static class Thread2 extends Thread {
        public void run() {
            synchronized (l2) {
                System.out.println("Thread 2: Holding lock 2...");
                try { Thread.sleep(10); }
                catch (InterruptedException e) {}
                System.out.println("Thread 2: Waiting for lock 1...");
                synchronized (l1) {
                    System.out.println("Thread 2: Holding lock 2 & 1...");
                }
            }
        }
    }
}

# 在war模块目录下执行，生成war文件
$ mvn install
...
# 解压war文件，war文件中包含了应用的依赖的Jar文件
$ unzip target/*.war -d target/war
...
# 检查重复类
$ show-duplicate-java-classes -c target/war/WEB-INF/classes target/war/WEB-INF/lib
...

find-in-jars 'log4j\.properties'
find-in-jars 'log4j\.xml$' -d /path/to/find/directory
find-in-jars log4j\\.xml
find-in-jars 'log4j\.properties|log4j\.xml'

$ ./find-in-jars 'Service.class$'
./WEB-INF/libs/spring-2.5.6.SEC03.jar!org/springframework/stereotype/Service.class
./rpc-benchmark-0.0.1-SNAPSHOT.jar!com/taobao/rpc/benchmark/service/HelloService.class

========线程相关=======
1 : 查看占用cpu最高的线程情况
2 : 打印所有线程
3 : 打印线程数
4 : 按线程状态统计线程数
========GC相关=======
5 : 垃圾收集统计（包含原因）可以指定间隔时间及执行次数，默认1秒, 10次
6 : 显示堆中各代的空间可以指定间隔时间及执行次数，默认1秒，5次
7 : 垃圾收集统计。可以指定间隔时间及执行次数，默认1秒, 10次
8 : 打印perm区内存情况*会使程序暂停响应*
9 : 查看directbuffer情况
========堆对象相关=======
10 : dump heap到文件*会使程序暂停响应*默认保存到`pwd`/dump.bin,可指定其它路径
11 : 触发full gc。*会使程序暂停响应*
12 : 打印jvm heap统计*会使程序暂停响应*
13 : 打印jvm heap中top20的对象。*会使程序暂停响应*参数：1:按实例数量排序,2:按内存占用排序，默认为1
14 : 触发full gc后打印jvm heap中top20的对象。*会使程序暂停响应*参数：1:按实例数量排序,2:按内存占用排序，默认为1
15 : 输出所有类装载器在perm里产生的对象。可以指定间隔时间及执行次数
========其它=======
16 : 打印finalzer队列情况
17 : 显示classloader统计
18 : 显示jit编译统计
19 : 死锁检测
20 : 等待X秒，默认为1
q : exit