同步(对象) { } 问题
我遇到了一个性能问题，880 个线程同时执行 synchronized() { method() } ，这导致了一个主要的性能问题。
synchronized() 处等待的线程是否可能存在某种限制？哪里可以得到限额？
另一个问题是什么最好放入 synchronized( ? ) 中。因为我有不同的类访问该变量，所以我不能放置synchronized(this)。
I have ran into a perfomance problem where 880 threads are doing synchronized() { method() } in the same time and this has lead to a major perfomance problem.
Is it possible that there is some limit of threads waiting at synchronized()? Where can I get the limit?
Another question is what is best to put into synchronized( ? ). Because I have different classes accessing that variable, so I can not put synchronized(this).
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无法使用同步来限制任何内容，对于高级并发构造，您需要查看 http://java.sun.com/j2se/1.5.0/docs/api/java/util/concurrent/package-summary.html。
关于您在synchronized(?)中放入的内容，这意味着您锁定的内容，这取决于您想要实现的锁定行为。如果您有一个可以从所有不同类访问的全局变量（例如 public static Object LOCK = new Object();），并且您对其进行同步，那么所有类都将锁定该全局变量。
请查看有关同步的 Java 教程。
There is no way to limit anything with synchronized, for advanced concurrency constructs you need to have a look at http://java.sun.com/j2se/1.5.0/docs/api/java/util/concurrent/package-summary.html.
Regarding what you put inside synchronized(?), which means on what you lock on, it depends on the locking behavior you want to achieve. If you have a global (for example public static Object LOCK = new Object();) which is accessible from all different classes, and you synchronize on that, then all classes will be locking on that one.
Have a look at the java tutorial on synchronization.