jmeter PerfMon Metrics Collector相关疑问

1.ERROR: java.io.IOException: Agent is unreachable via TCP

没有连接到severAgent（jmeter和severAgent都用管理员权限打开），重启一个severAgent就能连上了

2.jmx，exec，tail

监控jmx需要在启动程序或者java虚拟机时加上 下面参数 且 要选择图中第一行中的要监控的属性 因为没有默认监控属性 不指定agent会报参数错误之类

-Dcom.sun.management.jmxremote 

java -Dcom.sun.management.jmxremote.port=4711 -Dcom.sun.management.jmxremote.authenticate=false \
  -Dcom.sun.management.jmxremote.local.only=false -Dcom.sun.management.jmxremote.ssl=false <other options>

java -Dcom.sun.management.jmxremote -jar Notepad.jar

JMX Metrics

Since version 0.5.2 Server Agent has ability to monitor some JMXvalues inside Java Virtual Machine. To enable JMX monitoring you must start Javawith some special properties enabled, like described here.Here's simplest (and not so secure) options to start Java with JMX enabled:

java -Dcom.sun.management.jmxremote.port=4711 -Dcom.sun.management.jmxremote.authenticate=false \
  -Dcom.sun.management.jmxremote.local.only=false -Dcom.sun.management.jmxremote.ssl=false <other options>

By default the Server Agent will try to connect to JMX server at localhost with port 4711.If you started JMX server at different host/port or using authentication with username/password,please, use following additional parameters:

• url=<hostname>\:<port>
• user=<username>
• password=<password>

相关资料：https://github.com/undera/perfmon-agent/blob/master/README.md#supported-metrics

https://docs.oracle.com/javase/6/docs/technotes/guides/management/agent.html