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The Good, the Bad, and the Leaky: jemalloc, bumpalo, and mimalloc in meilisearch

The author investigates memory leak reports in Meilisearch by analyzing three different memory allocators: jemalloc, bumpalo, and mimalloc. Through detailed testing with millions of small documents, they identify specific scenarios where memory usage patterns differ significantly between allocators. The investigation reveals that what appears as memory leaks may actually be normal allocator behavior rather than actual memory management issues.

Background

Memory allocators are critical components that manage dynamic memory allocation in applications. Different allocators have varying strategies for memory management, which can significantly impact performance and memory usage patterns in database systems like Meilisearch.

Source
Lobsters
Published
Mar 20, 2026 at 09:47 PM
Score
6.0 / 10