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