ion profile
of objects that are conservatively traced, broken down by stack trace.
(For each stack that reaches the allocator it maintains a byte count
and an object count.)  This is useful when deciding which object types
to do next when converting types to exact tracing.

<P> The "deletion profiler" compiles a profile of program sites that
invoke the delete operator on managed objects.  This is useful because
explicit deletion will be a source of bugs when using exact tracing:
exact tracing is entirely in