mmap

Technical Guide

mmap Cost Us Half the Disk — Part 10: 1.9x Behind klogg Until We Split Display (mmap) From Full Reads (pread)

We were getting 57% of the disk. An external USB SSD gives 927 MB/s under dd. Read the same 50 GB file from th…
2026.09.27
Technical Guide
Technical

ripgrep Is 2.9x Faster With no-mmap — Measured Against the Default mmap Read on One 51 GB File, on Three OSes

Searching a 51 GB file with ripgrep, adding --no-mmap can make it faster. On Windows, by up to 2.89×. On macOS…
2026.09.19
Technical