Who even uses jemalloc in 2026 anyway? (many major projects)

jemalloc, the alternative malloc implementation originally built for FreeBSD and long maintained by Meta, was archived in 2025 but has since been revived with Meta assuming control and releasing version 5.3.1. A survey of major projects shows most historic users — including Redis, Valkey, ClickHouse, TiKV, DuckDB, Firefox, Polars, FreeBSD, NetBSD, the Rust compiler, Cassandra, MariaDB, and Rails — still use jemalloc. A few projects like Apache Arrow switched to mimalloc, but several others switched to jemalloc after development had slowed. Competition from tcmalloc, mimalloc, and snmalloc continues to grow.