Short for Intel
's Physical Addressing Extensions, a scheme developed for 32 bit
Intel x86 CPU
s such as the Xeon
to permit addressing of more than 4 Gigabytes of memory.
Practically speaking, PAE permits a system with (say) 32GB of physical memory to make up to 3GB available to user level processes. Using more memory than this requires special programming to handle the awkward 36-bit addressing modes; IBM
for example, has ported DB2
to use a large amount of memory.
s are reminiscent of the painful period when we last bumped up against memory limits. Remember Himem
Such worries will hopefully disappear soon, given the advent of 64 bit
computers (e.g., the Mac G5
), which do not suffer such restrictions.