A candidate release now also runs a pass once the live cycle-headered
count has grown by 4096 objects since the last pass. A dead graph is
usually reachable from one candidate (its root), so the candidate count
alone let a few hundred dead graphs pile up before a pass, which then
walked them after they had left the cache.
markGray records the objects it grays and counts the ones still
externally referenced after the trial decrements. When none is, every
gray object is garbage, so the pass whitens the recorded set and skips
scan. markGray also records each edge it skips into an older generation,
so a restricted pass pins those targets without tracing the white set a
second time.
Adds the cyclic-graphs runtime benchmark and corpus programs 5700 and
5701.
Chris Tate
ce2e567922