On 30 Jan 2008, at 08:35, Michael Schnell wrote:
Yes, that is understable, because for example pointers are twice as
big, which results in more memory accesses and less pointers in the
CPU caches and more cache misses.
Is this a software design decision (to allow for large projects
using > 4Gig Memory) or does the architecture not provide an
effective way of storing the low 32 bits of pointers in 4 byte
memory locations.
If you want 32 bit pointers, use a 32 bit program. Most 64 bit kernels
support running 32 bit binaries (although not all userlands also
support 32 bit binaries).
(I suppose that in "small" processes the process address space is
0...0xFFFFFFFF.)
That is not correct. Some OSes even mark the entire lower 4GiB as
invalid for 64 bit processes.
Jonas
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