When will malloc use sbrk?

[Clarence Dold]

in article <2127 at bruce.OZ>, mmcg at bruce.OZ (Mike McGaughey) says:

-> I also need malloc(3) - because things
-> like curses and stdio use it.  However, it would be nice to be able to
-> check whether malloc will need to use sbrk() before calling malloc -
-> that way, I can give malloc large, aligned chunks of memory, to reduce
-> fragmentation.

-> (1) Is there any simple way to do this?  Is it possible, for example,

It might be as simple as compiling with -lmalloc, which is an optional
malloc library that does sbrk of large, contiguous memory space.
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