v3 vs v2

[Jura-Z]

Hey! Thanks for the great allocator, we're testing v3 and it is MUCH more better than v2.

Wondering where can I read more about the difference? Any risks in using v3 in production?

Thank you!

[skreborn]

The README says this about the dev3 branch (emphasis mine):

development branch for mimalloc v3-beta. This branch is downstream of dev. This version simplifies the lock-free ownership of previous versions, has no thread-local segments any more. This improves sharing of memory between threads, and on certain large workloads may use less memory with less fragmentation.

With that said, I'd love to know what needs to be done to get v3 over the finish line and declare it production ready.

[daanx]

I would say v3 is production ready as it is already running at large scale on some big services -- I will soon remove the beta tag. However, there are still some benchmarks (in Lean) where v3 performance is bit worse than v2 (~10 to 20%) and I would like to still address this. Generally though with the reduced memory usage, v3.1.5+ is nowadays preferable.