Please contact Red Hat to check on costs. Retrieved July 8, Retrieved July 5, Like this: Like Loading Loading Comments Sorry, your blog cannot share posts by email. While they can stand on their own, they assume that you read them in order. Pushing the Limits of Windows: Physical Memory.
Pushing the Limits of Windows: Virtual Memory. Pushing the Limits of Windows: Processes and Threads. Pushing the Limits of Windows: Handles. One of the most fundamental resources on a computer is physical memory. Windows' memory manager is responsible with populating memory with the code and data of active processes, device drivers, and the operating system itself.
Because most systems access more code and data than can fit in physical memory as they run, physical memory is in essence a window into the code and data used over time. The amount of memory can therefore affect performance, because when data or code a process or the operating system needs is not present, the memory manager must bring it in from disk.
Besides affecting performance, the amount of physical memory impacts other resource limits. For example, the amount of non-paged pool, operating system buffers backed by physical memory, is obviously constrained by physical memory. Physical memory also contributes to the system virtual memory limit, which is the sum of roughly the size of physical memory plus the maximum configured size of any paging files.
Physical memory also can indirectly limit the maximum number of processes, which I'll talk about in a future post on process and thread limits. Windows support for physical memory is dictated by hardware limitations, licensing, operating system data structures, and driver compatibility. You can see physical memory support licensing differentiation across the server SKUs for all versions of Windows. Any X64 Windows or X86 Server release can.
The limit that these versions impose is the highest permitted physical RAM address, not the size of the IO space. For example, drivers could map the "lost" memory regions located above 4 GB and expose this memory as a RAM disk.
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