Issue #9687 has been updated by Koichi Sasada.
Status changed from Open to Closed
% Done changed from 0 to 100
Applied in changeset r45468.
- gc.c (gc_before_sweep): cap
malloc_limit' to gc_params.malloc_limit_max. It can grow and grow with such case:loop{“a” * (1024 ** 2)}’
[Bug #9687]
This issue is pointed by Tim R.on.
http://www.omniref.com/blog/blog/2014/03/27/ruby-garbage-collection-still-not-ready-for-production/
Bug #9687: Make a cap for malloc_limit adjustment
https://bugs.ruby-lang.org/issues/9687#change-45987
- Author: Koichi Sasada
- Status: Closed
- Priority: Normal
- Assignee: Koichi Sasada
- Category: core
- Target version: current: 2.2.0
- ruby -v: 2.2
- Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN
The blog post [Ruby Garbage Collection: Still Not Ready for Production]
(http://www.omniref.com/blog/blog/2014/03/27/ruby-garbage-collection-still-not-ready-for-production/)
pointed out that the following code consumes all of memory:
while true
"a" * (1024 ** 2)
end
This is because `malloc_limit’ grows and grows infinitely.
The following patch will solve this issue.
Index: gc.c
===================================================================
--- gc.c (revision 45433)
+++ gc.c (working copy)
@@ -2890,7 +2890,7 @@ gc_before_sweep(rb_objspace_t *objspace)
malloc_limit = (size_t)(inc *
gc_params.malloc_limit_growth_factor);
if (gc_params.malloc_limit_max > 0 && /* ignore max-check if 0 */
malloc_limit > gc_params.malloc_limit_max) {
- malloc_limit = inc;
+ malloc_limit = gc_params.malloc_limit_max;
}
}
else {
Maybe this patch should be applied for 2.1.x series.