ring the number of stacks and how they're sorted </h2>

<P> The stacks are dumped from the <tt>GC::~GC</tt> method in GC.cpp;
there are calls to <tt>dumpTopBacktraces</tt> for the two profilers.
Those calls pass parameters for the number of stacks to dump and how
to sort them (by byte volume or object count).  Passing the number of
stacks as zero means to dump them all.  It's probably meaningless to
dump deletion traces by byte volume.


<h2> Things to watch out for </h2>

<P> There's one profiler per GC.  