在每一个实例下，我运行一个简单的程序，测定循环调用一个方法10,000,000次所需的运行时间，我调用了同步和非同步两个版本，并比较了结果。
In each case, I ran a simple program that measured the run time of a loop calling a method 10,000,000 times, calling both a synchronized and an unsynchronized version, and compared the results.
synchgc类型表示同步gc，它是从头到尾连续运行的gc循环；即，不与应用程序交错运行。
A synchgc type represents a synchronous gc, which is a gc cycle that ran uninterrupted from beginning to end; that is, interleaving with the application didn't happen. These can occur for two reasons.
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