For pages, as we just saw, the walker sets A/D bits entirely in hardware. The microcode sequencer never even knows it happened.
With these changes bandwidth use dropped to around 4.5 KB/sec 3. Much improved, but we can still do better.
，这一点在im钱包官方下载中也有详细论述
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We know where it broke, but we can’t see why. Was it a race condition? Did a database read return stale data that has since been overwritten? To find the cause, we have to mentally reconstruct the state of the world as it existed milliseconds before the crash. Welcome to debugging hell.