内存映射文件可以有多大？

什么限制了内存映射文件的大小？我知道它不能大于未分配地址空间的最大连续块，并且应该有足够的可用磁盘空间。但还有其他限制吗？

You're being too conservative: A memory-mapped file can be larger than the address space. The view of the memory-mapped file is limited by OS memory constraints, but that's only the part of the file you're looking at at one time. (And I guess technically you could map multiple views of discontinuous parts of the file at once, so aside from overhead and page length constraints, it's only the total # of bytes you're looking at that poses a limit. You could look at bytes [0 to 1024] and bytes [2⁴⁰ to 2⁴⁰ + 1024] with two separate views.)

在 MS Windows 中，查看文件映射视图 http://msdn.microsoft.com/en-us/library/aa366761(VS.85).aspx功能。它实际上采用 64 位文件偏移量和 32 位长度。