kapynOpen Source

mimalloc: A new, high-performance, scalable memory allocator for the modern era

mimalloc is a new open-source memory allocator providing high performance and scalability. This drop-in replacement for malloc/free offers bounded allocation times, low fragmentation, and minimal contention, making it ideal for modern AI development workloads. Its small codebase and easy integration simplify adoption into existing projects.

Microsoft Research·May 13, 2026

Opening Kapyn…