his unmerged area will soon filled with smallest cells whose size is
the same as a cons.
The default value is 0.3.
The larger values, like 0.4, which specifies 40% of free heap should be
unmerged, favors for consing but do harm to instantiating
bigger cells like float-vectors, edges, faces, etc.
</DD>
</DL>
<BR>
<BR>

<P>

<A NAME="21950"></A>
<B>sys:*gc-margin*</B> [variable]

<DL COMPACT>
<DT> 
<DD> 
is a memory management parameter.
<B>*gc-margin</B> determines the ratio of
free heap size versus the tota