Achieving precise coordinated cluster time in a cluster environment
Achieving precise coordinated cluster time in a cluster environment
复制标题
在集群环境中实现精确协调的集群时间
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
Li Zhang
中科院分区：
文献类型：
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作者：
S. Froehlich;M. Hack;Xiaoqiao Meng;Li Zhang
提出了一种计时机制，用于在计算机集群之间提供微秒级的一致时间。提出的机制是基于一种新的时钟导向算法，该算法使用分段线性映射以平滑的方式将本地时钟与外部参考时钟对齐。我们提出了两种算法的实现：一种是基于脉冲每秒（PPS），另一种是基于低延迟定时消息交换。通过该机制得到的时间称为协调簇时间（CCT）。它具有定义良好的接口，因此应用程序可以使用它，开销很小。此外，该接口完全处理闰秒问题。我们在IBM BladeCenters上实现了CCT，并将其与NTP进行了比较。实验结果表明，该机构达到了1微秒的精度。
A time-keeping mechanism is proposed for providing microsecond-level consistent time across a cluster of computers. The proposed mechanism is based on a new clock steering algorithm that uses piecewise linear mapping to align a local clock to an external reference clock in a smooth manner. We present two realizations of the algorithm: one is based on pulse-per-second (PPS) and the other is based on low-latency timing message exchange. The time derived by the proposed mechanism is called CCT (coordinated cluster time). It has a well-defined interface such that it can be used by applications with little overhead. Moreover, the interface deals completely with leap second issues. We implemented CCT on IBM BladeCenters and compared it to NTP. Experimental results demonstrate that the proposed mechanism achieves one microsecond precision.