Providing Runtime Clock Synchronization With Minimal Node-to-Node Time Deviation on XT4s and XT5s
Terry Jones, Gregory A. Koenig · OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) · 2011
We present a new high precision clock synchronization algorithm designed for large XT4 and XT5 leadership-class machines. The algorithm, which is designed to support OS noise reduction through co-scheduling, is suitable for usage cases requiring low overhead and minimal time deviation between nodes. Unlike most high-precision algorithms which reach their precision in a post-mortem analysis after the application has completed, the new ORNL developed algorithm rapidly provides precise results during runtime. Previous to our work, the leading high-precision clock synchronization algorithms that made results available during runtime relied on probabilistic schemes that are not guaranteed to result in an answer.