Le lundi 24 à 0:29, C Anthony Risinger a écrit : > On Mon, May 24, 2010 at 12:02 AM, Keith Hinton <keithint1234@xxxxxxxxx> wrote: >> I had a question about the sixty four bit port of Arch in general >> so figured this would be an okay place besides IRC to obtain any >> help I needed. I wanted to find out ruffly how much memory Arch >> sixty four will use for any program in general, regardless of >> GUI/console? > > i really don't think there is a way to answer this. i'm not an expert > on hardware, but 64bit applies to the CPU, nothing else. a larger > bottom level cache allows the CPU to view/consume more data/bits at > once, and to perform better on precision mathematics like heavy > floating point operations. i don't see it having much-to-any effect > on RAM usage, but again maybe i'm missing something and then someone > will surely correct me :-) On a 64 bit machine, in « char *p; », p will use 64 bits (8 bytes), instead of 4 bytes in a 32 bits machine [I'm talking about p, not about *p which doesn't look like it exists]. Gary Wright seems to be saying that the impact is negligible. Nicky726 seems to be saying that there is a difference of up to 80%. I am surprised by such a claim, but there seems to be anecdotes on Google of people seeing the same thing. As I don't have a 64 bits machine, I can't test for myself. -- Fred
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