c++ - Lua garbage collection and C userdata -

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in game engine expose vector , color objects lua, using userdata.

now, every locally created vector , color within lua scripts, luas memory usage goes bit, doesn't fall until garbage collector runs.

the garbage collector causes small lagspike in game.

shouldn't vector , color objects deleted if used arguments? example like: myobject:setposition( vector( 123,456 ) )

they aren't right - memory usage of lua rises 1,5 mb each second, lag spike occurs , goes 50kb.

  • how can solve problem, solvable?

in lua, way object userdata can deleted garbage collector. can call garbage collector directly, b mitch wrote (use lua_gc(l, lua_cgstep, ...)), there no warranty temporary object freed.

the best way solve avoid creation of temporary objects. if need pass fixed parameters methods setposition, try modify api accepts numeric arguments, avoiding creation of temporary object, so:

myobject:setposition(123, 456)

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