Topic

page cache

2 posts

posix_fadvise SEQUENTIAL vs RANDOM: Read Hint Lab

Hands-on posix_fadvise SEQUENTIAL vs RANDOM vs NORMAL lab on localhost: cold and warm 256MiB reads after drop_caches with real measured p50 MB/s and RPS.

1 Oct 20266 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