其他分享
首页 > 其他分享> > 【性能优化】小伙伴问我性能指标监控怎么做，这次我安排上了！！

【性能优化】小伙伴问我性能指标监控怎么做，这次我安排上了！！

作者：互联网

写在前面

在【冰河技术】微信公众号的《【高并发】面试官：性能优化有哪些衡量指标？需要注意什么？》一文中，介绍了性能优化的衡量指标和期间需要注意的事项，属于理论篇的内容。这不，在文章下方就有小伙伴问我：监控怎么做？我理解了他的意思后，今天就安排上了。

小伙伴的疑问

小伙伴：监控怎么做？

我：你指的是？

小伙伴：性能指标。

我：后面会专门写这些文章。

在这里插入图片描述

使用JMX监控Tomcat

关于监控的文章，先写些什么呢？想来想去，我们先来写一篇使用JMX监控Tomcat的实战文章吧。好了，我们直接进入主题。

激活Tomcat的JMX远程配置

要通过JMX远程监控Tomcat，首先需要激活Tomcat的JMX远程配置。

① 修改脚本

先修改Tomcat的启动脚本，windows下为bin/catalina.bat（linux下为catalina.sh），添加以下内容，8999是jmxremote使用的端口号，第二个false表示不需要鉴权：

set JMX_REMOTE_CONFIG=-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=8999 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false
set CATALINA_OPTS=%CATALINA_OPTS% %JMX_REMOTE_CONFIG%

要注意以上语句的位置不能太后面，可以加在【if “%OS%” == “Windows_NT” setlocal】一句后的大段的注释后面。

参考官方说明：

② 鉴权

上面的配置是不需要鉴权的，如果需要鉴权则添加的内容为：

set JMX_REMOTE_CONFIG=-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=8999 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=true -Dcom.sun.management.jmxremote.password.file=../conf/jmxremote.password -Dcom.sun.management.jmxremote.access.file=../conf/jmxremote.access
set CATALINA_OPTS=%CATALINA_OPTS% %JMX_REMOTE_CONFIG%

③ 复制并修改授权文件

$JAVA_HOME/jre/lib/management下有jmxremote.access和jmxremote.password的模板文件，将两个文件复制到$CATALINA_BASE/conf目录下

◆ 修改$CATALINA_BASE/conf/jmxremote.access 添加内容

monitorRole readonly
controlRole readwrite

◆ 修改$CATALINA_BASE/conf/jmxremote.password 添加内容：

monitorRole binghe
controlRole binghe

注意： 如果进行了以上步骤导致Tomcat启动不了，那么很可能是密码文件的权限问题

需要修改jmxremote.password文件的访问权限，只有运行Tomcat的用户才能拥有访问权限 ：

Windows的NTFS文件系统下，选中文件，点右键 -->“属性”–>“安全”–> 点“高级”–> 点“更改权限”–> 去掉“从父项继承…”–> 弹出窗口中选“删除”，这样就删除了所有访问权限。再选“添加”–> “高级”–> “立即查找”，选中你的用户（或用户组，如果选用户不行那就选用户组），例administrator，点“确定"，“确定"。来到权限项目窗口，勾选“完全控制”，点“确定”，OK了。

官方的提示

The password file should be read-only and only accessible by the operating system user Tomcat is running as.

④验证配置

重新启动Tomcat，在Windows命令行输入“netstat -a”查看配置的端口号是否已打开，如果打开，说明上面的配置成功了。

⑤ 使用jconsole测试JMX

运行$JAVA_HOME/bin目录下的jconsole.exe，打开J2SE监视和管理控制台，然后建立连接，如果是本地的Tomcat则直接选择然后点击连接，如果是远程的，则进入远程选项卡，填写地址、端口号、用户名、口令即可连接。。Mbean属性页中给出了相应的数据，Catalina中是tomcat的，java.lang是jvm的。对于加粗的黑体属性值，需双击一下才可看内容。

代码获取监控指标

String jmxURL = "service:jmx:rmi:///jndi/rmi://192.168.10.93:8999/jmxrmi";
JMXServiceURL serviceURL = new JMXServiceURL(jmxURL);
 
Map map = new HashMap();
// 用户名密码，在jmxremote.password文件中查看
String[] credentials = new String[] { "monitorRole", "tomcat" };
map.put("jmx.remote.credentials", credentials);
JMXConnector connector = JMXConnectorFactory.connect(serviceURL, map);
MBeanServerConnection mbsc = connector.getMBeanServerConnection();
 
// 端口最好是动态取得
ObjectName threadObjName = new ObjectName("Catalina:type=ThreadPool,name=http-8080");
MBeanInfo mbInfo = mbsc.getMBeanInfo(threadObjName);
 
// tomcat的线程数对应的属性值
String attrName = "currentThreadCount";
MBeanAttributeInfo[] mbAttributes = mbInfo.getAttributes();
System.out.println("currentThreadCount:" + mbsc.getAttribute(threadObjName, attrName));

import java.lang.management.MemoryUsage;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Formatter;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
 
import javax.management.MBeanAttributeInfo;
import javax.management.MBeanInfo;
import javax.management.MBeanServerConnection;
import javax.management.ObjectInstance;
import javax.management.ObjectName;
import javax.management.openmbean.CompositeDataSupport;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
import javax.management.remote.JMXServiceURL;
/**
 * @author binghe
 * @description JMX监控Tomcat代码实战
 */
public class JMXTest {
	public static void main(String[] args) {
		try {
			String jmxURL = "service:jmx:rmi:///jndi/rmi://127.0.0.1:8999/jmxrmi";
			JMXServiceURL serviceURL = new JMXServiceURL(jmxURL);
			Map map = new HashMap();
			String[] credentials = new String[] { "monitorRole", "tomcat" };
			map.put("jmx.remote.credentials", credentials);
			JMXConnector connector = JMXConnectorFactory.connect(serviceURL,map);
			MBeanServerConnection mbsc = connector.getMBeanServerConnection();
			// 端口最好是动态取得
			ObjectName threadObjName = new ObjectName("Catalina:type=ThreadPool,name=http-8080");
			MBeanInfo mbInfo = mbsc.getMBeanInfo(threadObjName);
			String attrName = "currentThreadCount";// tomcat的线程数对应的属性值
			MBeanAttributeInfo[] mbAttributes = mbInfo.getAttributes();
			System.out.println("currentThreadCount:" + mbsc.getAttribute(threadObjName, attrName));
 
			// heap
			for (int j = 0; j < mbsc.getDomains().length; j++) {
				System.out.println("###########" + mbsc.getDomains()[j]);
			}
			Set MBeanset = mbsc.queryMBeans(null, null);
			System.out.println("MBeanset.size() : " + MBeanset.size());
			Iterator MBeansetIterator = MBeanset.iterator();
			while (MBeansetIterator.hasNext()) {
				ObjectInstance objectInstance = (ObjectInstance) MBeansetIterator.next();
				ObjectName objectName = objectInstance.getObjectName();
				String canonicalName = objectName.getCanonicalName();
				System.out.println("canonicalName : " + canonicalName);
				if (canonicalName.equals("Catalina:host=localhost,type=Cluster")) {
					// Get details of cluster MBeans
					System.out.println("Cluster MBeans Details:");
					System.out.println("=========================================");
					// getMBeansDetails(canonicalName);
					String canonicalKeyPropList = objectName.getCanonicalKeyPropertyListString();
				}
			}
			// ------------------------- system ----------------------
			ObjectName runtimeObjName = new ObjectName("java.lang:type=Runtime");
			System.out.println("厂商:"+ (String) mbsc.getAttribute(runtimeObjName, "VmVendor"));
			System.out.println("程序:"+ (String) mbsc.getAttribute(runtimeObjName, "VmName"));
			System.out.println("版本:"+ (String) mbsc.getAttribute(runtimeObjName, "VmVersion"));
			Date starttime = new Date((Long) mbsc.getAttribute(runtimeObjName,"StartTime"));
			SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
			System.out.println("启动时间:" + df.format(starttime));
 
			Long timespan = (Long) mbsc.getAttribute(runtimeObjName, "Uptime");
			System.out.println("连续工作时间:" + JMXTest.formatTimeSpan(timespan));
			// ------------------------ JVM -------------------------
			// 堆使用率
			ObjectName heapObjName = new ObjectName("java.lang:type=Memory");
			MemoryUsage heapMemoryUsage = MemoryUsage.from((CompositeDataSupport) mbsc.getAttribute(heapObjName,"HeapMemoryUsage"));
			long maxMemory = heapMemoryUsage.getMax();// 堆最大
			long commitMemory = heapMemoryUsage.getCommitted();// 堆当前分配
			long usedMemory = heapMemoryUsage.getUsed();
			System.out.println("heap:" + (double) usedMemory * 100 / commitMemory + "%");// 堆使用率
 
			MemoryUsage nonheapMemoryUsage = MemoryUsage.from((CompositeDataSupport) mbsc.getAttribute(heapObjName,"NonHeapMemoryUsage"));
			long noncommitMemory = nonheapMemoryUsage.getCommitted();
			long nonusedMemory = heapMemoryUsage.getUsed();
			System.out.println("nonheap:" + (double) nonusedMemory * 100 / noncommitMemory + "%");
 
			ObjectName permObjName = new ObjectName("java.lang:type=MemoryPool,name=Perm Gen");
			MemoryUsage permGenUsage = MemoryUsage.from((CompositeDataSupport) mbsc.getAttribute(permObjName, "Usage"));
			long committed = permGenUsage.getCommitted();// 持久堆大小
			long used = heapMemoryUsage.getUsed();//
			System.out.println("perm gen:" + (double) used * 100 / committed + "%");// 持久堆使用率
 
			// -------------------- Session ---------------
			ObjectName managerObjName = new ObjectName("Catalina:type=Manager,*");
			Set<ObjectName> s = mbsc.queryNames(managerObjName, null);
			for (ObjectName obj : s) {
				System.out.println("应用名:" + obj.getKeyProperty("path"));
				ObjectName objname = new ObjectName(obj.getCanonicalName());
				System.out.println("最大会话数:" + mbsc.getAttribute(objname, "maxActiveSessions"));
				System.out.println("会话数:" + mbsc.getAttribute(objname, "activeSessions"));
				System.out.println("活动会话数:" + mbsc.getAttribute(objname, "sessionCounter"));
			}
 
			// ----------------- Thread Pool ----------------
			ObjectName threadpoolObjName = new ObjectName("Catalina:type=ThreadPool,*");
			Set<ObjectName> s2 = mbsc.queryNames(threadpoolObjName, null);
			for (ObjectName obj : s2) {
				System.out.println("端口名:" + obj.getKeyProperty("name"));
				ObjectName objname = new ObjectName(obj.getCanonicalName());
				System.out.println("最大线程数:" + mbsc.getAttribute(objname, "maxThreads"));
				System.out.println("当前线程数:" + mbsc.getAttribute(objname, "currentThreadCount"));
				System.out.println("繁忙线程数:" + mbsc.getAttribute(objname, "currentThreadsBusy"));
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
 
	public static String formatTimeSpan(long span) {
		long minseconds = span % 1000;
 
		span = span / 1000;
		long seconds = span % 60;
 
		span = span / 60;
		long mins = span % 60;
 
		span = span / 60;
		long hours = span % 24;
 
		span = span / 24;
		long days = span;
		return (new Formatter()).format("%1$d天 %2$02d:%3$02d:%4$02d.%5$03d", days, hours, mins, seconds, minseconds).toString();
	}
}

Tomcat9 JVM参数调优

修改配置

#要添加在tomcat 的bin 下catalina.sh 里添加
JAVA_OPTS="-Xms1024m -Xmx2048m -Xss2048K -XX:PermSize=128m -XX:MaxPermSize=256m"

参数说明

Tomcat 相关参数优化

连接数，线程数，缓存，修改server.xml

打开被注释的默认连接池配置。

默认配置如下所示：

<!--  
<Executor name="tomcatThreadPool" namePrefix="catalina-exec-"  
maxThreads="150" minSpareThreads="4"/>  
-->

修改实例：

<Executor name="tomcatThreadPool" namePrefix="catalina-exec-"  
         maxThreads="150" 
         minSpareThreads="100"   
         prestartminSpareThreads="true" 
         maxQueueSize="100"/>

参数说明：

修改后的配置如下所示：

<Connector port="8080" protocol="HTTP/1.1"
        connectionTimeout="20000"  
        redirectPort="8443"   
        executor="tomcatThreadPool"  
        enableLookups="false"   
        maxIdleTime="60000"
        acceptCount="100"   
        maxPostSize="10485760" 
        acceptorThreadCount="2"    
        disableUploadTimeout="true"   
        URIEncoding="utf-8"
        keepAliveTimeout ="6000"  
        maxKeppAliveRequests="500"   
      />

参数说明：

好了，今天就到这儿吧，我是冰河，咱们下期见！！

 

标签：management,ObjectName,小伙伴,System,mbsc,监控,println,性能指标,out
来源： https://blog.51cto.com/binghe001/2928960