From d9d3993d1dbb2de11e15dd243df8be81681c46e5 Mon Sep 17 00:00:00 2001 From: Tim Peters Date: Sat, 2 Nov 2019 12:06:31 -0500 Subject: Years overdue, explain why unreachable objects are moved. (GH-17030) --- Modules/gcmodule.c | 39 ++++++++++++++++++++++++++++++++++++++- 1 file changed, 38 insertions(+), 1 deletion(-) diff --git a/Modules/gcmodule.c b/Modules/gcmodule.c index 1307aa3..b258a0f 100644 --- a/Modules/gcmodule.c +++ b/Modules/gcmodule.c @@ -1087,7 +1087,8 @@ deduce_unreachable(PyGC_Head *base, PyGC_Head *unreachable) { * everything else (in base) to unreachable. * NOTE: This used to move the reachable objects into a reachable * set instead. But most things usually turn out to be reachable, - * so it's more efficient to move the unreachable things. + * so it's more efficient to move the unreachable things. See note + ^ [REACHABLE OR UNREACHABLE?} at the file end. */ gc_list_init(unreachable); move_unreachable(base, unreachable); // gc_prev is pointer again @@ -2183,3 +2184,39 @@ PyObject_GC_Del(void *op) } PyObject_FREE(g); } + +/* ------------------------------------------------------------------------ +Notes + +[REACHABLE OR UNREACHABLE?} + +It "sounds slick" to move the unreachable objects, until you think about +it - the reason it pays isn't actually obvious. + +Suppose we create objects A, B, C in that order. They appear in the young +generation in the same order. If B points to A, and C to B, and C is +reachable from outside, then the adjusted refcounts will be 0, 0, and 1 +respectively. + +When move_unreachable finds A, A is moved to the unreachable list. The +same for B when it's first encountered. Then C is traversed, B is moved +_back_ to the reachable list. B is eventually traversed, and then A is +moved back to the reachable list. + +So instead of not moving at all, the reachable objects B and A are moved +twice each. Why is this a win? A straightforward algorithm to move the +reachable objects instead would move A, B, and C once each. + +The key is that this dance leaves the objects in order C, B, A - it's +reversed from the original order. On all _subsequent_ scans, none of +them will move. Since most objects aren't in cycles, this can save an +unbounded number of moves across an unbounded number of later collections. +It can cost more only the first time the chain is scanned. + +Drawback: move_unreachable is also used to find out what's still trash +after finalizers may resurrect objects. In _that_ case most unreachable +objects will remain unreachable, so it would be more efficient to move +the reachable objects instead. But this is a one-time cost, probably not +worth complicating the code to speed just a little. +------------------------------------------------------------------------ */ + -- cgit v0.12 700065fff'>bug_1700065fff Tk is a free and open-source, cross-platform widget toolkit that provides a library of basic elements of GUI widgets for building a graphical user interface (GUI) in many programming languages.
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