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Why can 7-Zip use big dictionary in 32-bit Windows?

April 26, 2017big dictionary Windows

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Why can 7-Zip use big dictionary in 32-bit Windows?

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32-bit Windows allocates only 2 GB of virtual space per one application. Also that block of 2 GB can be fragmented (for example, by some DLL file), so 7-Zip can’t allocate one big contiguous block of virtual space. There are no such limitations in 64-bit Windows. So you can use any dictionary in Windows x64, if you have required amount of physical RAM.