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【并发编程047】缓存锁定性能优于总线锁定, 为什么不淘汰总线锁定?
2022-04-22 12:16:00 【檀越剑指大厂】
缓存锁定性能优于总线锁定, 为什么不淘汰总线锁定?
有两种情况下处理器不会使用缓存锁定。
第一种情况是: 当操作的数据不能被缓存在处理器内部 (比如外部磁盘数据) , 或操作的数据跨 多个缓存行 (cache line) 时, 则处理器会调用总线锁定。
第二种情况是: 有些处理器不支持缓存锁定 。对于Intel 486和Pentium处理器, 就算锁定的 内存 区域在处理器的缓存行中也会调用总线锁定。
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本文为[檀越剑指大厂]所创,转载请带上原文链接,感谢
https://qinyingjie.blog.csdn.net/article/details/124337901
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