5 ms·

the Huygens algorithm is also worth a look https://www.usenix.org/system/files/conference/nsdi18/nsdi18-geng.pdf https://www.usenix.org/system/files/conference

• danzheng 9mo ago
  A very clever part of the HUYGENS algorithm is that it doesn’t just sync clocks pair-wise, it leverages a natural network effect where a group of pair-wise synchronized clocks becomes transitively synchronized, helping reduce errors further without requiring specialized hardware. That’s one of the key reasons it can achieve ~100 nanoseconds of software-based sync on commodity networks. The authors’ work forms the basis of what the team at Clockwork.io is building, enabling accurate one-way delay measurements (rather than just RTT/2) that improve latency visibility and telemetry across CPU and GPU infrastructure