This edition
Blastbeat: Replacing 10 Years of C++ with Rust and io_uring
November 03 2026 - 14:45 (45 min )
At Meta, every server runs a network observability agent sending 500K+ UDP probes per second to detect network faults in all networks: fabrics, AI training and backbone. The original C++ implementation served us well for a decade, but its synchronous architecture hit a wall: too much CPU, too many syscalls, with the codebase showing the signs of he works of more than 60 contributors.
LEVEL: Intermediate
We rewrote it in Rust. Results: 80% less CPU, 98% fewer syscalls, and a unified binary replacing two C++ processes. This component includes many advanced features, such as hardware timestamps and bitflip detection, while maintaining sub-100us RTT accuracy.
LEVEL: Intermediate
