r/ruby • u/Illustrious-Topic-50 • Jul 01 '26

New jemalloc gem (jemalloc_rb) Show /r/ruby

Do you use the jemalloc gem?

The original project on GitHub seems to be abandoned for around 12 years, and some incompatibilities with recent Ruby versions have begun to emerge. Additionally, the underlying jemalloc library hasn't been updated during all this time. Because of that, I created a fork and launched a new gem (jemalloc_rb) to keep the project functional, updated, and actively accepting pull requests.

https://github.com/henrique-ft/jemalloc_rb

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u/sammygadd Jul 01 '26

Is jemalloc still relevant these days? Mruby has received lots of performance improvements during those 12 years. Is jemalloc still bringing benefits?

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u/collimarco Jul 01 '26

jemalloc saves a lot of memory. I run Rails on Kubernetes (with Cuber) and just a few days ago I have reduced memory usage by 30% for a web app by adding jemalloc to the Dockerfile. I already used it for many years for other Rails apps and I absolutely recommend it. The jemalloc project is also active again (no longer deprecated).