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- Subject: Re: Garbage Collection bottleneck
- From: Joshua Jensen <jjensen@...>
- Date: Wed, 21 Jun 2006 12:19:01 -0600
Brian Weed wrote:
We are using Lua 5.02 in our game engine, and although we had no
problems on previous projects, the garbage collection now seems to be
a bottleneck (noticable pause in the main loop when the GC executes).
You could look into luarc, a reference counted version of Lua. It
doesn't have the 5.0.3 fixes in it, but I do believe it is current to
5.0.2 (although a failing memory never helps). Its webpage is at
http://luaplus.org/tiki-index.php?page=luarc. You want the build out of
The problem stems from my creation of some temporary global variables
inside each tick of the main loop.
Although it seems that the incremental GC of Lua v5.1 would probably
solve this problem, upgrading is a last resort...I am looking for
solutions that don't involve upgrading.
The reference counting seems stable and there is really no performance
comparison between the standard mark-sweep collector (which still exists
in luarc to handle table cycles) and the reference counting's ability to
destroy objects immediately. The reference counting Lua has shipped a
number of Xbox and Xbox 360 console titles, although they've only
shipped through LuaPlus (which is where the reference counting was
born). I believe all LuaPlus reference counting changes are merged into