Tag: design-os

All the articles with the tag "design-os".

• System Design - How Memory-Mapped Files (mmap) Work

  26 Jul, 2026

  How memory-mapped files (mmap) work: virtual memory mapping, page faults, kernel page cache interaction, copy-on-write semantics, and why databases love and hate them.

• System Design - How Copy-on-Write (COW) Works

  20 Jun, 2026

  How Copy-on-Write works across operating systems, databases, and filesystems: the core mechanism behind fork(), Redis snapshots, LMDB reads, B-tree databases, and modern filesystems like Btrfs and ZFS.