When did OCaml start using mmap for heap allocation?

#1

I believe OCaml uses mmap to allocate memory but used to depend on malloc. At least OCaml 4.02 seems to have used malloc but I could not find in the Changes file when this change was introduced and would be curious. I had asked about GC details at A lesson from Ruby's GC? and learned about OCaml now using mmap, which shields it from assumptions made by malloc.

#2

3.08 had it already

It was implemented in 3.05 it seems.

#3

And it looks like it was enabled by default:

This puzzles me because I see a huge impact by using jemalloc instead of glibc malloc in a program compiled with OCaml 4.02.

1 Like