Dev Tools · 2h ago
C TCP server benchmarks show epoll slashes latency from 1.5s to microseconds
A developer rebuilt a TCP echo server seven times, from blocking accept() to epoll, measuring latency at each step. The simplest version stalled a second client for 1.51 seconds while the first connection idled. The epoll-based version eliminated that stall, serving all clients concurrently.
Meridian48 take
The benchmarks confirm textbook I/O model trade-offs with real numbers, but the 1.5-second stall is an extreme case—real servers rarely hold idle connections that long.
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From one blocking accept() to epoll: a C TCP server up the I/O ladder, measured →
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c-tcp-serverio-models