digitalmars.D.bugs - [Issue 24006] New: Document locking behavior of the default GC
- d-bugmail puremagic.com (21/22) Jun 21 2023 https://issues.dlang.org/show_bug.cgi?id=24006
https://issues.dlang.org/show_bug.cgi?id=24006 Issue ID: 24006 Summary: Document locking behavior of the default GC Product: D Version: D2 Hardware: x86 OS: All Status: NEW Severity: enhancement Priority: P1 Component: dlang.org Assignee: nobody puremagic.com Reporter: andrej.mitrovich gmail.com As Steven mentions here: https://forum.dlang.org/post/u6tgl4$1v07$1 digitalmars.comThe D GC has a single global lock to allocate memory -- even memory that might be on a free list. So the threads are all bottlenecked on waiting their turn for the lock.This behavior isn't documented on https://dlang.org/spec/garbage.html But it is mentioned in passing on this page: https://dlang.org/articles/d-array-article.html#caching Specifically "Doing this means an O(lg(n)) lookup in the GC's memory pool for every append (not to mention acquiring the global GC lock)." --
Jun 21 2023