On 02/01/2015 06:05 PM, Alexandre Torres Porres wrote: >> >> Seems Pd runs faster if compiled to 64 bits in a 64 bit OS than if it were >> compiled as 32, which does makes sense. That's all? >> > > "*no : pd compiled for 64 bit system will not run on 32 bit sytem, and it > will not load 32 bit externals.*" > > sure, but it still runs faster if compiled to 64 bits in a 64 bit OS, right? >
why? if you run a 32bit binary on a 64bit OS, there might be some overhead involved (bit then i really don't know much about the performance of multi-arch systems) if you run a 32bit binary on a 32bit OS on a 64bit CPU (x86_64, which is compatible with 32bit CPUs), then it might be slightly slower than compared to a full 64bit system. the real advantages are: - memory access! a 32bit application/OS uses 32bit pointers to access memory. this limits the accessible memory to 4GB (your OS might be able to manage more using PAE; but the application itself will have a maximum of 4GB.) a 64bit application uses 64bit pointers to access memory. thats much more as you are likely to ever see in your lifetime (but then: 2640k are enough" anybody?) - modern OSs are 64bit (even the not-so-modern w32[sic!] has started to become a 64bit system). it seems silly to run 32bit applications on such systems (and a waste of ressources, as you need to install a 32bit version the entire runtime-environment) also check out: http://en.wikipedia.org/wiki/64-bit_computing fgrsam IOhannes
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