如果核心A正在修改一个变量X,核心B正在读到该变量(X)。 在此情况下,一项切合一致议定书将更新核心B的切身,因为X经核心A修改,而这种切合将减缓核心B的执行。 然而,考虑到变数X在其海滩上居住,这种切合也会影响核心A的绩效。
是的。 有若干方法可以影响业绩。 人员使用的标准议定书是《多国企业(现代化、共享、无效)》的一些变量,有时是O(所有权人),而且经常是E(排他性)。 例如,核心A将在经过修改的(或排他性)状态中开始,而核心B的解读将迫使核心A转变为共同国家。 这一行动在海滩上循环,因为核心在任何特定时间只能开展这么多的行动。 这对核心A的影响非常大,尽管它不是关键的道路。 如果核心A再次书写,则影响更大。 由于海滩线位于共享的(或无效的)状态,它必须发出将自己升级到M或E的要求。 这项请求必须去B核心部分。 这项行动正处于关键的道路上,在海滩区升级之前,书面工作可以结束。 尽管如此,文字通常被缓冲,处理器一般不会因这一行动而受阻。
是的,在目前使用ME(O)SI一致性议定书的微层装置上,它将放慢对<代码>X的更新。 其原因是,Bs读到后将把含有<代码>X的切条线带入共同国家,然后再将其复制,然后用纸件将B复制件无效,以便进入排他性国家,然后再加以修改。
That all said, A s writes to X might not actually stall A s execution pipeline. This depends on the memory consistency model of the architecture and programming language, and whether the write is forced out as an atomic operation or a subsequent write fence.
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