Dev Tools · 1h ago
Why swapping std::deque for boost::circular_buffer spiked CPU usage 10x
A developer replaced std::deque with boost::circular_buffer in an audio player's FIFO buffer, expecting better performance. Instead, CPU usage jumped from 1-3% to 20-30% due to the circular buffer's overhead for byte-streaming. Microbenchmarks had misled the developer; real-world throughput was at least 2x worse.
Meridian48 take
The story is a cautionary tale that microbenchmarks can mask real-world performance pitfalls, especially when data structure assumptions don't match actual usage patterns.
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The circular_buffer trap: how a 'faster' data structure spiked my CPU from 2% to 25% →
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cpp-performancedata-structures