The short version
A general-purpose allocator with profiling, memory controls, and per-thread counters.
From the HackerLinks archive
Jemalloc
A general-purpose allocator with profiling, memory controls, and per-thread counters.
At a glance:
First seen:2026-09-19
Last seen:2026-09-19
Times seen:1
Website:github.com
Why it caught our attention
Users reported lower Rails memory use and useful per-thread workload budgeting.
Where it surfaced on Hacker News
2026-09-19
“Jemalloc is great for Ruby on Rails apps, and drastically reduces memory usage for the same workloads.”
collimarco · recommendation · production use
Direct HN comment
“I use Jemalloc on a project because it has per-thread allocation counters.”
atombender · recommendation · first hand use
Direct HN comment
Jemalloc 5.4.0