Enables one of two alternate memory
allocators. Only one can be enabled at a time. MEMSYS5 is essentially the same
as MEMSYS3, only it uses a
power-of-two, first-fit algorithm. MEMSYS3 tends to be more frugal with memory,
while MEMSYS5 is better at
preventing fragmentation. Determining which module is best for
your specific needs is largely an issue of testing and
measuring.