主要指当测试多用户并发访问同一个应用、模块、数据时是否产生隐藏的并发问题，如内存泄漏、线程锁、资源争用问题，几乎所有的性能测试都会涉及并发测试。
创建足够任务来运行后续并发测试。
Create enough tasks to run the subsequent concurrency tests.
另一方面，软件测试人员的整个目标是观察这一产品并发现它的问题，从而改进它。
A software tester, on the other hand, their entire goal is to look at this product and find problems with it, to improve it.
多测试并发的线程数目，获得一个临界最优值。
Test the number of threads to find the best performance point.
应用推荐