Virtual memory is conceptually simple but potentially devastating to performance. Every memory access must go through segmentation (add segment base, check limit) and then paging (look up the page table). Naively, paging alone requires two additional memory reads per access -- one for the page directory entry, one for the page table entry.
Transform backpressure gaps
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This is an especially important point when it comes to work communications, with many white collar workers now using chat platforms like Slack and Microsoft Teams rather than email to communicate.
我永远不会忘记第一次与乔布斯的谈话。当时苹果正在谷底挣扎，史蒂夫试图扭转局势。很多人怀疑公司能否存活。有人警告我，加入苹果的风险巨大。