yalloc is a memory allocator designed to provide affordable safety without sacrificing performance. It is a drop-in replacement for system allocators, ensuring compatibility with C11 while offering advanced features like double free detection, low overhead diagnostics, and multithreading support, all packaged in a compact and efficient solution.
yalloc is an innovative memory allocator designed to deliver an affordable level of safety in a compact package while being fully compatible with C11 standards. It serves as a drop-in replacement for system functions like malloc(), free(), and their related library counterparts.
Key Features
- Segregated Metadata: The allocator maintains metadata separate from user data, minimizing the risk of metadata corruption and enhancing cache and TLB efficiency.
- Memory Safety: yalloc effectively detects double and invalid frees, ensuring internal control structures are safeguarded. It includes configurable handling and reporting capabilities while supporting concurrent access from multiple threads.
- Multithreading Support: Utilizing non-blocking atomics, yalloc creates heaps on-demand to minimize contention among threads, making it suitable for high-performance multi-threaded applications.
- Configurable Statistics & Diagnostics: With low overhead, detailed statistics, tracing, and diagnostics can be activated to provide insight into memory allocation behaviors.
- Compact Code Size: The implementation spans roughly 8,000 lines of code that compile into about 60 KB, ensuring minimal complexity and external dependencies.
- Performance: yalloc ranks competitively in various benchmarks, demonstrating strong performance metrics in real-world applications.
Current Status
As an alpha release, yalloc shows no outstanding issues. Most benchmarks and tests yield satisfactory results on 64-bit Linux and MacOS systems, with integration into the musl C library for widespread compatibility.
Detailed Diagnostics and Troubleshooting
yalloc incorporates numerous features to aid troubleshooting:
- Statistics & Tracing: Allows developers to enable detailed memory statistics and runtime tracing with minimal overhead.
- Callsite Reporting: Incorporate file coordinates in memory allocation traces to facilitate debugging.
- Valgrind Support: Use Valgrind to analyze dynamic allocations and catch illegal memory accesses, enhancing the reliability of applications using yalloc.
Usage Patterns
yalloc excels in specific memory usage scenarios, particularly:
- Short-lived block allocations where memory is frequently allocated and freed.
- Similar-sized block allocations commonly required in data structures like graphs.
- High-frequency allocations and reuses within controlled environments.
Development Tools
The development of yalloc is supported by various tools:
- Valgrind: For dynamic analysis of memory usage and leaks.
- PVS-Studio: A static analysis tool for code quality enhancement.
- Coverity: For additional static code analysis.
In conclusion, yalloc presents a reliable and efficient solution for memory allocation needs, combining safety features with impressive performance metrics, ideal for developers seeking robust memory management in their applications.
