modulovalue

A blog by Modestas Valauskas.

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Systems & Performance 1 Software Engineering 1

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I built a 2x faster lexer, then discovered I/O was the real bottleneck

2026187 points92 comments Systems & Performance details

Archiving 104K files into tar.gz reduced I/O time by 43x and total processing time by 2.3x. The bottleneck was not disk speed, it was syscall overhead.