<div class="info ">
Heap compaction is triggered when the estimated amount
       of "wasted" memory is more than <code class="code">max_overhead</code> percent of the
       amount of live data.  If <code class="code">max_overhead</code> is set to 0, heap
       compaction is triggered at the end of each major GC cycle
       (this setting is intended for testing purposes only).
       If <code class="code">max_overhead &gt;= 1000000</code>, compaction is never triggered.
       If compaction is permanentl