Xcode 仪器。虚拟内存是什么意思？ iPhone OS 没有虚拟机？

Question

我一直盯着仪器中的内存监视器，我正在抓我的。为什么显示虚拟内存？ iPhone OS 没有虚拟内存。这是什么意思？

我担心的是，我的 iPad 应用程序收到内存警告，但应用程序的实际内存从未超过 70MB，虚拟内存从未超过 180MB？

有人可以启发我吗？

干杯，
道格

Answer 1

( Virtual memory 并不(仅仅)意味着将硬盘用作内存，而是一种将应用程序中使用的地址转换为真实物理内存位置的技术。)

来自 New Feature in iPhone OS 3.1 with Snow Leopard: VM Tracker :

The VM Tracker instrument is designed to report on a target process' virtual memory space, showing all of the regions mapped into the address space along with information and statistics relevant to the mapping type. For example, a region that is a memory-mapped file via an mmap call will show as a "mapped file" region and display the path for the file it references. Instruments shows size statistics for each region as well: virtual, resident, and dirty.