RuntimeMXBean getName 耗时长_managementfactory.getruntimemxbean().getname()

作者：繁依Fanyi0 | 2024-04-06 13:38:46

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managementfactory.getruntimemxbean().getname()

程序在启动时发现耗时很长，通过jstack 进程号发现卡在获取进程名上，用了30秒

RuntimeMXBean runtimeMXBean = ManagementFactory.getRuntimeMXBean();

runtimeMXBean.getName();

getName用了30秒

于是写了一个测试类放在服务器上执行，并在此jstack 进程号获取堆栈信息


public class Test {
 
	public static void main(String[] args) {
		System.out.print("start"); 
		RuntimeMXBean runtimeMXBean = ManagementFactory.getRuntimeMXBean();
		System.out.print("name:"+runtimeMXBean.getName());
 
	}
 
}

发现卡在at java.net.Inet6AddressImpl.lookupAllHostAddr 这句

"main" #1 prio=5 os_prio=0 tid=0x00002b2450009800 nid=0x1a2c9 runnable [0x00002b244ca75000]
java.lang.Thread.State: RUNNABLE
at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:929)
at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1324)
at java.net.InetAddress.getLocalHost(InetAddress.java:1501)
- locked <0x0000000580163720> (a java.lang.Object)
at sun.management.VMManagementImpl.getVmId(VMManagementImpl.java:140)
at sun.management.RuntimeImpl.getName(RuntimeImpl.java:59)
at test.Test.main(Test.java:11)

猜想是和网络主机设置有关

最后发现 cat /etc/hosts 中设置的ip对应的主机名和 /etc/sysconfig/network 中设置的主机名不一致导致的，修改为一致就可以了

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