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.
这是一个小数目，这是任何人的猜测，如果它构成临界质量。
This is a small number and it is anyone's guess if it constitutes a critical mass.
当温度降低到TC以下时，磁极化子的数目和体积达到一个临界值，磁极化子之间产生铁磁交换作用。
While the temperature is lowered to TC the number and volume reach a crisis value, ferromagnetism of exchanging effect is occurred.
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