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Coding & systems
Memory Optimization
Allocators, layout, cache behaviour
Overview
About memory optimization questions in quant interviews
Custom allocators, object pools, data layout, and the memory-model questions low-latency desks use to test whether you understand what the hardware actually does.
How to study this topic
A path that works
- 1
Start with the easy set
Warm up with the 8 easy memory optimization questions. Quick wins build pattern recognition before complexity ramps.
- 2
Drill the medium tier next
13 medium questions sit in the sweet spot where most interview questions cluster. Time yourself, then redo any you missed two days later.
- 3
Stress-test on hard problems
15 hard questions simulate the on-site round. Skip looking at solutions for at least 20 minutes, then write up your approach.
The library
All 36 memory optimization questions
easyPlacement New in BuffereasyStack-Allocated Fixed ArrayeasyLegacy Resource ManagementeasyFree-List Memory PooleasyFixed Capacity Stack StringeasyBinary Header CasteasyStruct Layout InspectoreasyShared Pointer BasicsmediumPMR Pool AllocatormediumMemory-Mapped File AllocatormediumLinear Memory ArenamediumCache-Line Aligned Market Data StructmediumImplementing Move SemanticsmediumWeak Pointer CachemediumHuge Page AllocatormediumLow Latency Memory WarmupmediumAligned Memory Allocator for AVX-512mediumCache-Aligned Atomic CountersmediumRAII Scope Exit Cleanup GuardmediumNUMA-Node-Pinned Buffer Allocation (Portable Simulation)mediumCustom STL AllocatorhardLow-Latency Tagged UnionhardStatic Polymorphism with CRTPhardSmall Vector OptimizationhardGC-Free Object Graph via Region AllocatorhardFixed-Size Slab Allocator (PMR)hardReference-Counted Object PoolhardType-Erased SBO Callable (std::function Replacement)hardChained PMR ResourceshardFlyweight Symbol PoolhardZero-Copy FlatBuffer Order Parsing via reinterpret_casthardIntrusive Smart PointerhardSmall String Optimization (SSO)hardThread-Local Arena Allocator (jemalloc Arena Pattern)hardVirtual Address Space Warmup (Portable Pre-fault Simulation)very hardCompacting Memory Allocator
View all 36 memory optimization questionsRelated topics