[arch-general] A question about Arch Sixty Four
wriggary at gmail.com
Mon May 24 21:13:45 EDT 2010
2010/5/24 Frédéric Perrin <frederic.perrin at resel.fr>:
> 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.
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
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:
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.
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