The Global Stack holds Prolog structures, lists, strings and long numbers.
So the user's selection of data structures is largely responsible
for the growth of this stack (cf. 
).
In coroutining mode, delayed goals also consume space on the Global Stack.
It also stores source variable names for terms which
were read in with the flag variable_names being on.
When this feature is not needed, it should be turned off
so that space on the global stack is saved.
The global stack grows while a program creates data structures.
It is popped only on failure. ECLiPSe
therefore provides a garbage collector
for the Global Stack which is called when a certain amount
of new space has been consumed. See section for how this process
can be controlled.
Note again that unnecessary nondeterminism reduces the amount of garbage
that can be reclaimed and should therefore be avoided.