Interesting stuff. These guys made some of the same conclusions around management that we made when implementing per-thread caching for libumem[1] (in particular, around summing all per-thread caches and managing that number). It would be interesting to benchmark these two allocators; we do some dynamic code generation that allows for cache sizes tuned without sacrificing performance.

[1] http://dtrace.org/blogs/rm/2012/07/16/per-thread-caching-in-...