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Now, OsmAnd performs another Dijkstra search, but this time on the much smaller "base graph." This graph consists only of the border points and the pre-calculated shortcut values between them.，这一点在谷歌浏览器【最新下载地址】中也有详细论述
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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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