https://answer.freetools.me/tags/false-sharing/ Recent content in False Sharing on Answer Hugo -- 0.152.2 zh-cn Fri, 06 Mar 2026 07:21:29 +0800 https://answer.freetools.me/%E4%BC%AA%E5%85%B1%E4%BA%AB%E5%BD%93%E4%BD%A0%E7%9A%84%E5%A4%9A%E7%BA%BF%E7%A8%8B%E4%BB%A3%E7%A0%81%E6%85%A2%E4%BA%86100%E5%80%8D%E5%8D%B4%E6%89%BE%E4%B8%8D%E5%88%B0%E5%8E%9F%E5%9B%A0/ Fri, 06 Mar 2026 07:21:29 +0800 https://answer.freetools.me/%E4%BC%AA%E5%85%B1%E4%BA%AB%E5%BD%93%E4%BD%A0%E7%9A%84%E5%A4%9A%E7%BA%BF%E7%A8%8B%E4%BB%A3%E7%A0%81%E6%85%A2%E4%BA%86100%E5%80%8D%E5%8D%B4%E6%89%BE%E4%B8%8D%E5%88%B0%E5%8E%9F%E5%9B%A0/ 深入解析CPU缓存伪共享问题：从MESI缓存一致性协议的底层原理，到跨NUMA节点的性能灾难，再到Java @Contended、Go CacheLinePad、C++ alignas等各语言的解决方案。基于Herb Sutter经典文章、LMAX Disruptor最佳实践，以及真实的性能基准测试数据（性能损失可达100倍），揭示这个"隐形性能杀手"的技术本质。 https://answer.freetools.me/%E5%86%85%E5%AD%98%E5%AF%B9%E9%BD%90%E4%B8%BA%E4%BB%80%E4%B9%88%E4%BD%A0%E7%9A%84%E7%BB%93%E6%9E%84%E4%BD%93%E5%8F%AF%E8%83%BD%E6%AF%94%E9%A2%84%E6%9C%9F%E5%A4%A7%E4%B8%89%E5%80%8D/ Fri, 06 Mar 2026 01:51:44 +0800 https://answer.freetools.me/%E5%86%85%E5%AD%98%E5%AF%B9%E9%BD%90%E4%B8%BA%E4%BB%80%E4%B9%88%E4%BD%A0%E7%9A%84%E7%BB%93%E6%9E%84%E4%BD%93%E5%8F%AF%E8%83%BD%E6%AF%94%E9%A2%84%E6%9C%9F%E5%A4%A7%E4%B8%89%E5%80%8D/ 从硬件内存控制器的物理约束到编译器的填充策略，深入解析内存对齐的完整技术脉络。文章揭示了一个char+int+char+double的结构体为何占用24字节而非14字节，剖析x86的宽容与ARM/MIPS的严格对非对齐访问的不同处理方式，展示False Sharing如何让多线程程序慢100倍，并提供结构体重排序、packed属性、aligned_alloc等实用优化技术。