About this question

GC-Free Object Graph via Region Allocator

Hard · memory_optimization · Quant Developer interview question · region-allocator, arena, gc-free, memory_optimization, bump-pointer, object-graph

High-frequency trading systems generate dense, short-lived object graphs for each transaction, where standard heap allocation leads to performance bottlenecks like lock contention and cache misses. Region (or arena) allocation mitigates this by allocating all objects for a single cycle from a contiguous memory slab, which is then freed in a single O(1) operation. This technique eliminates per-object deallocation overhead and avoids garbage collection pauses, ensuring predictable, low-latency exe