Topic

mmap vs read

2 posts

mmap vs read Byte-Sum Scan: Localhost Lab

Hands-on mmap vs read vs chunked sequential byte-sum scan lab: real MB/s on a generated fixture (not page-touch), measured on Linux localhost for SREs.

1 Oct 20264 min read

mmap vs read (+ O_DIRECT): Localhost Sequential Scan Lab

Hands-on mmap vs buffered read lab: 256 MiB p50 11.5 vs 5.4 GB/s; O_DIRECT ~0.9 GB/s warm-cache bypass. Fake endpoint-only GB/s disclosed. No Docker.

30 Sept 20265 min read