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Easy · low_latency · Quant Developer interview question · compiler-barrier, memory-fence, low-latency, c++, volatile, chrono, timing, lock-free
Compiler optimizers can aggressively reorder memory operations, which poses significant challenges for precise latency measurements and the correctness of lock-free algorithms. Compiler barriers, such as asm volatile("" ::: "memory"), are essential tools that prevent the compiler from reordering instructions across the barrier, ensuring memory visibility and ordering. This technique is critical in quantitative finance for accurately benchmarking low-latency trading strategies and guaranteeing th