第一次执行com.alibaba.csp.sentinel.SphU#entry(java.lang

第一次执行com.alibaba.csp.sentinel.SphU#entry(java.lang.String)会觉得很慢

MetricTimerListener在初始化的过程中会创建一个MetricWriter对象，该类的对象里面会调用getPid()并且最终调用InetAddress.getLocalHost()，目前我这边通过调用com.alibaba.csp.sentinel.slots.block.flow.FlowRuleManager#getRules()来预先初始化MetricTimerListener，有没有更好的办法？

下面是调用栈：

"main" #1 prio=5 os_prio=31 tid=0x00007fe10080b000 nid=0x2803 runnable [0x0000700007965000] java.lang.Thread.State: RUNNABLE at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method) at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:928) at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1323) at java.net.InetAddress.getLocalHost(InetAddress.java:1500) - locked <0x000000076ba7bea0> (a java.lang.Object) at sun.management.VMManagementImpl.getVmId(VMManagementImpl.java:140) at sun.management.RuntimeImpl.getName(RuntimeImpl.java:59) at com.alibaba.csp.sentinel.util.PidUtil.getPid(PidUtil.java:26) at com.alibaba.csp.sentinel.node.metric.MetricWriter.(MetricWriter.java:80) at com.alibaba.csp.sentinel.node.metric.MetricTimerListener.(MetricTimerListener.java:33) at com.alibaba.csp.sentinel.slots.block.flow.FlowRuleManager.(FlowRuleManager.java:64) at com.alibaba.csp.sentinel.slots.block.flow.FlowSlot.entry(FlowSlot.java:117) at com.alibaba.csp.sentinel.slots.block.flow.FlowSlot.entry(FlowSlot.java:111) at com.alibaba.csp.sentinel.slotchain.AbstractLinkedProcessorSlot.transformEntry(AbstractLinkedProcessorSlot.java:40) at com.alibaba.csp.sentinel.slotchain.AbstractLinkedProcessorSlot.fireEntry(AbstractLinkedProcessorSlot.java:32) at com.alibaba.csp.sentinel.slots.block.authority.AuthoritySlot.entry(AuthoritySlot.java:39) at com.alibaba.csp.sentinel.slots.block.authority.AuthoritySlot.entry(AuthoritySlot.java:33) at com.alibaba.csp.sentinel.slotchain.AbstractLinkedProcessorSlot.transformEntry(AbstractLinkedProcessorSlot.java:40) at com.alibaba.csp.sentinel.slotchain.AbstractLinkedProcessorSlot.fireEntry(AbstractLinkedProcessorSlot.java:32) at com.alibaba.csp.sentinel.slots.system.SystemSlot.entry(SystemSlot.java:36) at com.alibaba.csp.sentinel.slots.system.SystemSlot.entry(SystemSlot.java:30) at com.alibaba.csp.sentinel.slotchain.AbstractLinkedProcessorSlot.transformEntry(AbstractLinkedProcessorSlot.java:40) at com.alibaba.csp.sentinel.slotchain.AbstractLinkedProcessorSlot.fireEntry(AbstractLinkedProcessorSlot.java:32) at com.alibaba.csp.sentinel.slots.statistic.StatisticSlot.entry(StatisticSlot.java:54) at com.alibaba.csp.sentinel.slots.statistic.StatisticSlot.entry(StatisticSlot.java:48) at com.alibaba.csp.sentinel.slotchain.AbstractLinkedProcessorSlot.transformEntry(AbstractLinkedProcessorSlot.java:40) at com.alibaba.csp.sentinel.slotchain.AbstractLinkedProcessorSlot.fireEntry(AbstractLinkedProcessorSlot.java:32) at com.alibaba.csp.sentinel.slots.logger.LogSlot.entry(LogSlot.java:35) at com.alibaba.csp.sentinel.slots.logger.LogSlot.entry(LogSlot.java:29) at com.alibaba.csp.sentinel.slotchain.AbstractLinkedProcessorSlot.transformEntry(AbstractLinkedProcessorSlot.java:40) at com.alibaba.csp.sentinel.slotchain.AbstractLinkedProcessorSlot.fireEntry(AbstractLinkedProcessorSlot.java:32) at com.alibaba.csp.sentinel.slots.clusterbuilder.ClusterBuilderSlot.entry(ClusterBuilderSlot.java:103) at com.alibaba.csp.sentinel.slots.clusterbuilder.ClusterBuilderSlot.entry(ClusterBuilderSlot.java:48) at com.alibaba.csp.sentinel.slotchain.AbstractLinkedProcessorSlot.transformEntry(AbstractLinkedProcessorSlot.java:40) at com.alibaba.csp.sentinel.slotchain.AbstractLinkedProcessorSlot.fireEntry(AbstractLinkedProcessorSlot.java:32) at com.alibaba.csp.sentinel.slots.nodeselector.NodeSelectorSlot.entry(NodeSelectorSlot.java:171) at com.alibaba.csp.sentinel.slotchain.AbstractLinkedProcessorSlot.transformEntry(AbstractLinkedProcessorSlot.java:40) at com.alibaba.csp.sentinel.slotchain.AbstractLinkedProcessorSlot.fireEntry(AbstractLinkedProcessorSlot.java:32) at com.alibaba.csp.sentinel.slotchain.DefaultProcessorSlotChain$1.entry(DefaultProcessorSlotChain.java:31) at com.alibaba.csp.sentinel.slotchain.AbstractLinkedProcessorSlot.transformEntry(AbstractLinkedProcessorSlot.java:40) at com.alibaba.csp.sentinel.slotchain.DefaultProcessorSlotChain.entry(DefaultProcessorSlotChain.java:75) at com.alibaba.csp.sentinel.CtSph.entry(CtSph.java:157) at com.alibaba.csp.sentinel.CtSph.entry(CtSph.java:300) at com.alibaba.csp.sentinel.SphU.entry(SphU.java:86) at retry.RetryDemo.testSphU(RetryDemo.java:71) at retry.RetryDemo.main(RetryDemo.java:53)

原提问者GitHub用户junplus