你假笨



你假笨

因为GC或者内存dump,都必须对内存做一个遍历,因此必须先暂停这些Java线程,防止在遍历内存里的对象的时候进行内存分配,但是每个线程分配内存其实都是优先走tlab(每个线程独有的一块在eden里的小内存块)的,为了能快速遍历对象,而不存在不连续的内存,于是JVM会对tlab做一个填充,填充的正好是int数组对象(从上面代码得知),将剩下的没被分配的tlab内存给填满了,因此在系统运行过程中其实可能伴随着很多无用的对象产生,哈哈,看到这里你是不是豁然开朗?


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