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jvm调优工具Arthas阿尔萨斯

官方文档
https://arthas.aliyun.com/doc/

下载

curl -O https://arthas.aliyun.com/arthas-boot.jar

启动

java -jar arthas-boot.jar

FullGC_Problem01是我们刚启动的java进程

import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
public class FullGC_Problem01 { 

private static class CardInfo { 

BigDecimal price = new BigDecimal(0.0);
String name = "张三";
int age = 5;
Date birthdate = new Date();
public void m() { 
}
}
private static ScheduledThreadPoolExecutor executor = new ScheduledThreadPoolExecutor(50,
new ThreadPoolExecutor.DiscardOldestPolicy());
public static void main(String[] args) throws Exception { 

executor.setMaximumPoolSize(50);
for (;;) { 

modelFit();
Thread.sleep(100);
}
}
private static void modelFit() { 

List<CardInfo> taskList = getAllCardInfo();
taskList.forEach(info -> { 

// do something
executor.scheduleWithFixedDelay(() -> { 

// do sth with info
info.m();
}, 2, 3, TimeUnit.SECONDS);
});
}
private static List<CardInfo> getAllCardInfo() { 

List<CardInfo> taskList = new ArrayList<>();
for (int i = 0; i < 100; i++) { 

CardInfo ci = new CardInfo();
taskList.add(ci);
}
return taskList;
}
}

监控

输入1回车，将arthas挂上去

开始对FullGC_Problem1进程进行监控

dashboard

它会不断刷新

线程信息、内存信息、运行时环境

查看是否有线程死锁

thread -b

追踪方法的执行链路

trace FullGC_Problem01 modelFit