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

📰 Microsoft Research

Learn about mimalloc, a new high-performance memory allocator for modern systems, and how to integrate it into your projects for improved performance

intermediate Published 13 May 2026
Action Steps
  1. Download the mimalloc source code from the Microsoft Research repository
  2. Build and integrate mimalloc into your project as a replacement for malloc and free
  3. Configure your project to use mimalloc's atomic operations for minimal contention
  4. Test your application's performance with mimalloc to measure improvements
  5. Apply mimalloc to other projects that require high-performance memory allocation
Who Needs to Know This

Software engineers and developers can benefit from using mimalloc to optimize memory allocation in their applications, leading to improved performance and scalability

Key Insight

💡 mimalloc provides bounded worst-case allocation times and low internal fragmentation, making it a suitable replacement for traditional malloc and free functions

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💡 Introducing mimalloc: a high-performance, scalable memory allocator for modern systems! 🚀

Key Takeaways

Learn about mimalloc, a new high-performance memory allocator for modern systems, and how to integrate it into your projects for improved performance

Full Article

mimalloc is an open-source, modern, scalable memory allocator that is a drop-in replacement for malloc and free. It is relatively small (~12K lines), with clear internal data structures, and is easy to build and integrate into other projects. It provides bounded worst-case allocation times (up to OS primitives), bounded space overhead, low internal fragmentation, and minimal contention by relying almost exclusively on atomic operations. The post mimalloc: A new, high-performance, scalable memory
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