What surprised me was that this entire walk is fully hardware-driven -- no microcode involvement at all. The state machine reads the page directory entry, reads the page table entry, checks permissions, and writes back the Accessed and Dirty bits, all autonomously. Since it's hardware-driven, it runs in parallel with the microcode and needs its own memory bus arbitration -- the paging unit must share the bus with both data accesses from the microcode and prefetch requests from the instruction queue.
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The duration to apply the DOM changes dropped by 45% when we were able to remove JS glue code. DOM operations can already be expensive; WebAssembly users can’t afford to pay a 2x performance tax on top of that. And as this experiment shows, it is possible to remove the overhead.
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1977 年，塔可夫斯基在爱沙尼亚一个废弃的发电厂开启了《潜行者》的拍摄，这部影片借三个男人穿越“禁区”的神秘旅程，讲述了一个关于欲望和信仰的现代寓言，对信仰、希望和人性的探问贯穿影片。在日记中，塔可夫斯基记录着拍摄的艰辛，也记录着自己对这部作品的期待，他希望用镜头探讨人类的精神救赎。未承想，镜头里的荒凉和危险竟成了对现实的预言。影片的拍摄场地暴露在严重的环境污染下，最终让摄制组付出了惨痛的代价：主演阿纳托利・索洛尼岑、担任副导演的塔可夫斯基的妻子拉丽莎，还有塔可夫斯基本人，在拍摄结束后的几年里先后罹患癌症。病痛的阴影从此萦绕在他的日记里，成为他此后创作中无法回避的底色。