Memory allocation

[David]

Not sure if `learn` is the right topic or not to post this..

I've been going through Bob Nystrom's "Crafting Interpreters" for 
a bit of fun and over the weekend put together a toy allocator in 
D - free and gc not yet done. It's single threaded and 
unsurprisingly faster than malloc for small objects up to 512 
bytes, and about the same for larger objects (simulated with a 
linear distribution of size requests).

But I'd like to be able to benchmark it to see how I'm doing.

A colleague suggested I ask here for resources and pointers - I 
was trying to find stats on malloc performance (internal and 
external fragmentation, long running reuse, distributions of size 
requests for testing and comparison, how to reason about 
trade-offs of cache missing, branch misprediction, meta data, 
etc).

So academic papers, books, blogs, experiences are all welcome, 
especially with regard to optimising for immutability / COW - 
would be welcome or even just some good ol' conversation.