2010/5/24 Frédéric Perrin <frederic.perrin@xxxxxxxx>: > 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 Well, heres something vaguely empirical. Just downloaded the two latest netinstall medias and threw them on a usb stick. I ran precisely four commands after logging in as root on each netinstall arch: 1) mkdir /mnt/tmp 2) mount /dev/sda3 /mnt/tmp #my home partition 3) uname -a >> /mnt/tmp/gary/memcomp 4) free -m >> /mnt/tmp/gary/memcomp results to be seen here: http://aur.pastebin.com/YwTJA6cR short story: ~29 MB more used on x86_64... or about 30 percent. But when installing a whole system, many more variables come into play. It might have just been my dumb luck that ram usage ended up within 1-2 mb of eachother. Gary
