On Thu, 16 Aug 2012, Paolo Carlini wrote: > Hi, > > On 08/16/2012 03:39 PM, Richard Guenther wrote: > > This decreases the integer-share-limit to make sure the TREE_VEC we > > allocate for the small cached integers has a reasonable size for > > our GC memory allocator. > Out of curiosity (just in case you hav two spare minutes) do you have any idea > why this is so? I mean, naively one would think that allowing for any 8 bit > constant would be a nice idea; puzzlingly, however the comment in the code > says just "experimentation". I'm wondering if tweaking a bit the memory > allocator itself could allow for the full 8 bit range without a big memory > waste...
The GC memory allocator works on "pages", there are not pages of arbitrary size but only power-of-two sizes. It's hard to improve the allocator here. Richard.
