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oop in compressed oops stands for ordinary object pointer. These object pointers (as we saw in previous section) are the same size as the native pointers of the machine. So oops size is 32 bits or 64 bits on a 32bit and 64bit machine respectively. With compressed oops we have 32 bits ...
从下图中,我们可以看到的是,在一个正常的64位虚拟机中klass的长度是8字节,但是启动compressed oops后,它就变成了4字节了。 Representation of an Integer object in different VMs 2.2. compressed oops的实现 oop其实代表的是普通对象指针(ordinary object pointer)。这些对象指针和机器的本地指针的长度是一样长的,...