What is the maximum amount of memory any single process on
Windows can address? Is this different than the maximum
virtual memory for the system? How would this affect a
system design?
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Answer Posted / kunal
Actually processes access virtual memory space, not physical
memory. Applications never access RAM directly but only
through the memory management interface of the processor.
All processes have a 4GB virtual address space. The upper
2GB is common to all processes and is used by the system.
The lower 2GB is private to each process and is inaccessible
to all others. This is completely independent of the size of
RAM or the page file. The system maps physical memory into
this virtual address space according to both need and
availability.
At any given time the data in virtual memory space might be
stored in RAM, on disk, or both. All of this is totally
transparent to all applications. Frequently accessed data
will be kept in RAM with the remainder left on disk.
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