mimalloc
A compact, high-performance general-purpose memory allocator with excellent performance and security features.
What is mimalloc?
mimalloc is a high-performance, general-purpose memory allocator designed as a drop-in replacement for standard malloc. It solves problems of fragmentation, contention, and unpredictable latency in multi-threaded applications by using innovative techniques like free list sharding and eager page purging.
System programmers, runtime developers, and engineers building low-latency services or languages (like Koka and Lean) who need a reliable, fast allocator with predictable behavior.
Developers choose mimalloc for its consistent performance across benchmarks, lower memory footprint compared to jemalloc and tcmalloc, security features, and simplicity—being only about 10k LOC while handling large-scale workloads.
Overview
mimalloc is a compact general purpose allocator with excellent performance.
Use Cases
Best For
- Replacing malloc in performance-critical C/C++ applications
- Reducing memory fragmentation in long-running server programs
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