Issue #8092 has been updated by authorNari (Narihiro Nakamura).


Thank you for bug report.

But, the following test case is failure.

I think ko1-san is the implementer of GC.stat.
ko1-san, what do you think?

=== start ===
$ git diff test
diff --git a/test/ruby/test_gc.rb b/test/ruby/test_gc.rb
index bed58f3..8cb036a 100644
--- a/test/ruby/test_gc.rb
+++ b/test/ruby/test_gc.rb
@@ -64,6 +64,15 @@ class TestGc < Test::Unit::TestCase
     assert_equal(arg, res)
     assert_equal(false, res.empty?)
     assert_kind_of(Integer, res[:count])
+
+    stat, count = {}, {}
+    GC.start
+    GC.stat(stat)
+    ObjectSpace.count_objects(count)
+    puts ""
+    p stat
+    p count
+    assert_equal(stat[:heap_live_num], count[:TOTAL]-count[:FREE])
   end
 
   def test_singleton_method

$ % make test-all TESTS='ruby/test_defined.rb ruby/test_integer.rb ruby/test_objectspace.rb ruby/test_sprintf_comb.rb ruby/test_argf.rb ruby/test_fiber.rb ruby/test_gc.rb'
....
# Running tests:

[ 91/131] TestGc#test_stat
{:count=>351, :heap_used=>684, :heap_length=>1139, :heap_increment=>399, :heap_live_num=>46061, :heap_free_num=>152639, :heap_final_num=>0, :total_allocated_object=>402509, :total_freed_object=>356448}
{:TOTAL=>198553, :FREE=>152639, :T_OBJECT=>31312, :T_CLASS=>655, :T_MODULE=>56, :T_FLOAT=>10, :T_STRING=>8425, :T_REGEXP=>146, :T_ARRAY=>1966, :T_HASH=>49, :T_STRUCT=>10, :T_BIGNUM=>25, :T_FILE=>10, :T_DATA=>2225, :T_MATCH=>22, :T_COMPLEX=>1, :T_NODE=>934, :T_ICLASS=>68}
 = 0.01 s
  1) Failure:
test_stat(TestGc) [/home/nari/source/ruby/ruby-git/test/ruby/test_gc.rb:75]:
<46061> expected but was
<45914>.

Finished tests in 6.628281s, 19.7638 tests/s, 657.9383 assertions/s.
131 tests, 4361 assertions, 1 failures, 0 errors, 0 skips

ruby -v: ruby 2.1.0dev (2013-03-14 trunk 38552) [x86_64-linux]
make: *** [yes-test-all] Error 1
=== end ===

----------------------------------------
Bug #8092: [patch] gc: improve accuracy of objspace_live_num() and allocated/freed counters
https://bugs.ruby-lang.org/issues/8092#change-37690

Author: tmm1 (Aman Gupta)
Status: Open
Priority: Normal
Assignee: authorNari (Narihiro Nakamura)
Category: core
Target version: 
ruby -v: ruby 2.1.0dev (2013-03-14 trunk 39748) [x86_64-darwin12.2.1]


Test with large rails app:

  ruby -e'
    require "./config/environment"

    stat, count = {}, {}
    GC.start
    GC.stat(stat)
    ObjectSpace.count_objects(count)

    printf "%d == %d\n", stat[:heap_live_num], count[:TOTAL]-count[:FREE]
  '

Without patch:

    632974 == 628506

With patch:

    628506 == 628506

diff --git a/gc.c b/gc.c
index bd95073..48f9470 100644
--- a/gc.c
+++ b/gc.c
@@ -1432,10 +1432,8 @@ finalize_list(rb_objspace_t *objspace, RVALUE *p)
 	run_final(objspace, (VALUE)p);
 	if (!FL_TEST(p, FL_SINGLETON)) { /* not freeing page */
             add_slot_local_freelist(objspace, p);
-            if (!is_lazy_sweeping(objspace)) {
-		objspace->total_freed_object_num++;
-		objspace->heap.free_num++;
-            }
+            objspace->total_freed_object_num++;
+            objspace->heap.free_num++;
 	}
 	else {
 	    struct heaps_slot *slot = (struct heaps_slot *)(VALUE)RDATA(p)->dmark;
@@ -1939,9 +1937,9 @@ slot_sweep(rb_objspace_t *objspace, struct heaps_slot *sweep_slot)
         else {
             sweep_slot->free_next = NULL;
         }
-	objspace->total_freed_object_num += freed_num;
 	objspace->heap.free_num += freed_num + empty_num;
     }
+    objspace->total_freed_object_num += freed_num;
     objspace->heap.final_num += final_num;
 
     if (deferred_final_list && !finalizing) {
@@ -2965,11 +2963,11 @@ rb_gc_force_recycle(VALUE p)
     rb_objspace_t *objspace = &rb_objspace;
     struct heaps_slot *slot;
 
+    objspace->total_freed_object_num++;
     if (MARKED_IN_BITMAP(GET_HEAP_BITMAP(p), p)) {
         add_slot_local_freelist(objspace, (RVALUE *)p);
     }
     else {
-	objspace->total_freed_object_num++;
 	objspace->heap.free_num++;
         slot = add_slot_local_freelist(objspace, (RVALUE *)p);
         if (slot->free_next == NULL) {



-- 
http://bugs.ruby-lang.org/