Therefore, you might want to test your application under load, and examine the performance counters to determine whether your application benefits from the larger address space. However, the file cache, paged pool, and nonpaged pool are smaller, which can adversely affect applications with heavy networking or I/O.
The 4-gigabyte tuning (4GT or 4GT RAM Tuning) feature, enabled with the BCDEdit /set increaseuserva command, increases the virtual address space that is available to the application up to 3 GB, and reduces the amount available to the system to between 1 and 2 GB.įor applications that are memory-intensive, such as database management systems (DBMS), the use of a larger virtual address space can provide considerable performance and scalability benefits. The virtual address space is divided so that 2 GB is available to the application and the other 2 GB is available only to the system. On 32-bit editions of Windows, applications have 4 gigabyte (GB) of virtual address space available.
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