计算机科学 ›› 2022, Vol. 49 ›› Issue (10): 52-58.doi: 10.11896/jsjkx.210800091
李明亮, 庞建民, 岳峰
LI Ming-liang, PANG Jian-min, YUE Feng
摘要： 在并行程序中,互斥锁通常被用来避免访问共享资源时发生冲突。申威26010处理器是“神威·太湖之光”超级计算机采用的异构众核处理器,众核之间并无硬件互斥锁机制。其开发人员基于原子操作实现了一种软件互斥锁,但是该软件锁在激烈锁竞争情况下会产生大量的锁操作开销,影响了并行程序的性能。针对这一问题,提出了一种分布式传递锁机制HDT-LOCK。首先,提出并实现了基于众核上便签存储器和主存的混合分布锁来避免访存拥塞;其次,设计了基于寄存器通信和单指令多数据指令(Single-instruction Multiple-data Instruction)的锁传递机制,以进一步提高HDT-LOCK机制的吞吐量。实验结果表明,与原锁机制相比,所提HDT-LOCK机制避免了访存拥塞,并且可扩展性更佳。此外,锁传递机制使HDT-LOCK的吞吐量提升最高可达5.6倍。
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| [1] | 陶小涵, 庞建民, 高伟, 王琦, 姚金阳. 基于SW26010处理器的FT程序的性能优化 Performance Optimization of FT Program Based on SW26010 Processor 计算机科学, 2019, 46(4): 321-328. https://doi.org/10.11896/j.issn.1002-137X.2019.04.050 |
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