Virtual memory is something that can be indexed by CPU alone, a 32 bit architecture is capable of generating 2^32 locations(say byte addressable machine then 2^32 bytes=4GB). Surely we can use demand paging if process size is bigger than RAM, but what if the process size is bigger than virtual memory itself ? Surely, you can again use demand paging, but my question is, how can CPU locate any bytes greater than 2^32 ? Say program is written has size of 5GB, how does cpu index the bytes greater than 5GB ? It can only generate locations till 4GB.
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https://stackoverflow.com/questions/8373944/how-does-pae-physical-address-extension-enable-an-address-space-larger-than-4g – Sagar Dec 13 '20 at 20:07
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@Sagar Can you elaborate it please, its still unclear to me – SpawN Dec 21 '20 at 05:47