即使一个程序只包括一个在单一处理器上运行的单线程，一个同步的方法调用仍要比非同步的方法调用慢。
Even when a program contains only a single thread running on a single processor, a synchronized method call is still slower than an unsynchronized method call.
基于新的执行注释，用户能清楚地规定其网络处理器中的回调函数应该以单线程的模式执行还是多线程的模式执行。
Based on the new execution annotations the user can define if the call back methods of his network handler should be executed in single threaded mode or multithreaded mode.
多年来，处理器制造厂商在不断提高时钟速度和指令级并行性，因此单线程代码不需要修改就可在新的处理器上更快运行。
For years, processor makers consistently delivered increases in clock rates and instruction-level parallelism, so that single-threaded code executed faster on newer processors with no modification.
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