jemalloc ☆

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Description:
Implementation of malloc emphasizing fragmentation avoidance

Type: Formula | Tracked Since: Dec 28, 2025

Links: Homepage | formulae.brew.sh

Category: System utilities

Tags: memory-management c-library performance profiling malloc

Install: brew install jemalloc

About:
Jemalloc is a general-purpose malloc implementation that emphasizes fragmentation avoidance and scalable concurrency support. It is widely used in large-scale applications like Facebook and FreeBSD to manage memory efficiently under heavy multithreaded workloads. The library provides robust profiling and leak detection capabilities, making it a powerful tool for optimizing application performance and stability.

Key Features:

Scalable multi-threaded memory allocation
Advanced fragmentation avoidance strategies
Built-in memory profiling and leak detection
Tunable allocation behaviors via runtime options

Use Cases:

High-performance server applications requiring efficient memory management
Debugging memory leaks and fragmentation in production systems

Alternatives:

tcmalloc – Google's allocator, optimized for low contention; Jemalloc often excels in long-running, fragmented workloads.
mimalloc – Microsoft's compact allocator focusing on speed; Jemalloc offers more mature profiling and tuning options.

Version History

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