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What happens when a program needs more memory than what was initially allocated to it?

From this lecture from Simon Fraser University, what I understand is that each process gets a virtual address space allocated to it by the operating system. Here is a hypothetical question based on ...
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virtual address space and physical RAM

On Ubuntu, when I look at meminfo, I notice that the virtual address space total is much greater than the physical ram total: /proc $ cat meminfo MemTotal: 6113156 kB ... VmallocTotal: ...
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How to determine the size of the virtual address space that Windows is using for usermode applications?

Is there some command or preferences dialog somewhere that will tell me the size of the virtual address space that Windows has set aside for usermode applications?
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Possible negative side effects of increasing the virtual address space for applications?

Here is my system's configuration: Windows 8 Developer Preview (32-bit) 2 GB RAM Nvidia GeForce 8400 M (w/ 256 MB RAM) In order to run a memory-intensive application, I needed to increase the ...