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如何测量线程等待数据库连接时出现的延迟？

[英]How to measure latency which appears when threads are awaiting for db connection?

原文 2017-04-08 08:09:37 7 1 java/ multithreading/ database-connection/ connection-pooling

Say I have java application with 10 deamon threads. 说我有10个守护进程线程的Java应用程序。

Say I have connection pool (for example c3p0) with maximum 3 connections. 说我有最多3个连接的连接池（例如c3p0）。

Each of threads is working with database. 每个线程都在使用数据库。 It could happen (ofcourse it really happens) when one thread is waiting for a connection in BLOCKED state. 当一个线程正在等待处于BLOCKED状态的连接时，可能会发生（当然确实会发生）。

And I need to measure total thread latency, when each of them is in BLOCKED state awaiting for the connection. 当它们每个处于等待连接的阻塞状态时，我需要测量总线程延迟。

What is the best way to do that? 最好的方法是什么？

1 个解决方案

Extend Thread with your own implementation and Override the method "notify" so it is saving "system.currentTimeMilis" in some kind of cache- you can call a method with the miliseconds argument to take care of the notifyTimes for each thread. 使用您自己的实现来扩展Thread并覆盖方法“ notify”，以便将“ system.currentTimeMilis”保存在某种缓存中-您可以调用带有miliseconds参数的方法来照顾每个线程的notifyTimes。 Then in your extended thread overide the run/start method and get again the currentTimeMilis. 然后，在扩展线程中，覆盖run / start方法并再次获取currentTimeMilis。 Get the currentTime of the wait method too (again override and dont forget to call the super method in the overridings). 还要获取wait方法的currentTime（再次重写，并且不要忘记在重写中调用super方法）。 Play with these 3 types of times of your threads and you should be able to do your benchmarks. 玩这三种类型的线程，您应该可以进行基准测试。