From: Eric Wong <normalperson@...>
Date: 2014-01-04T09:14:30+00:00
Subject: [ruby-core:59549] Re: [ruby-trunk - Feature #9362][Assigned] Minimize cache misshit to gain optimal speed

Potential for future improvement:

st_table and st_table_entry are both 48 bytes on 64-bit.  That means
those allocations may use 64-byte object slots and avoid going through
normal malloc.  AFAIK, glibc malloc (and probably other allocators) can
have around 2 words internal overhead, even, so we can avoid that
overhead by using Ruby object slots for those.