Internet Information Services (IIS) 7.0 Resource Kit
by Olga M. Londer Mike Volordarsky Brett Hill, Bernard Cheah, Steve Schofield, Carlos Aguiar Mares, Kurt Meyer, and Microsoft IIS Team
Windows Server 2008 x64
In the old 32-bit operating system environment, the total virtual memory address space is 4 gigabytes (GB) and, by default, it is divided into 2 GB each for applications and the operating system kernel. Though 2 GB of available memory to application may be sufficient for small and simple applications, it definitely does not work well for large-scale and complex applications. In the context of IIS, an application may be recycled when the worker process hits the memory limit.
On the other hand, the 64-bit operating system has much greater address space compared to 32-bit, and it is able to address up to 16 terabytes (TB). Although not many applications may need more than 4 GB of memory addresses, an x64 operating system enables ...
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