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GNU 32 bit or 64 bit question

Posted By: Frank Berger
Date: Sunday, 27 December 2009, at 11:45 a.m.

In Response To: GNU 32 bit or 64 bit question (Michael Petch)

Well after all it is not simple to predict.

With 64-bit you have obviously larger registers and you have *more* registers with 64-bit. Especially x86 has a very small set of registers compared to other modern CPUs. That's one coin of the medal. The other is that the adresses now have 64-bit too, that means it increases the load on the memory system which is nowadays a bottleneck. So unless you need more than 2-4 GB RAM, where 64-bit is needed, you have to measure how the speed of a 64-bit version compares to an 32-bit version and it might change from OS to OS too.

ciao Frank

Messages In This Thread

• GNU 32 bit or 64 bit question
  neilkaz -- Saturday, 26 December 2009, at 3:22 a.m.
  • GNU 32 bit or 64 bit question
    Michael Petch -- Sunday, 27 December 2009, at 12:51 a.m.
    • GNU 32 bit or 64 bit question
      neilkaz -- Sunday, 27 December 2009, at 1:04 a.m.
      • GNU 32 bit or 64 bit question
        Michael Petch -- Sunday, 27 December 2009, at 1:12 a.m.
        • GNU 32 bit or 64 bit question
          Frank Berger -- Sunday, 27 December 2009, at 11:45 a.m.
  • GNU 32 bit or 64 bit question
    samir -- Sunday, 27 December 2009, at 1:58 p.m.