• “Archaeologists Say They’ve Identified Traces of a 2,000-Year-Old Love Note Still Etched Into a Wall in Ancient Pompeii.” (Smithsonian).
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When a goroutine makes a system call — reading a file, accepting a network connection, anything that enters the kernel — the entire OS thread blocks. Before entering the kernel, the goroutine calls entersyscall(), which saves its context and changes its status to _Gsyscall. But here’s an important detail: the M doesn’t give up its P. It keeps it. Why? Because most system calls are fast — a few microseconds — and the goroutine will come back and keep running on the same P as if nothing happened. No locks, no coordination, no overhead.
而苹果的自研步伐还在加速，iPhone Air比iPhone 16e多加了一颗自研N1，能省的大概率不只是10美元，而且相较iPhone 16e比标准版便宜200美元的定价，iPhone Air比iPhone 17标准版反而贵了200美元。这一高一低，单机利润的增长空间相当可观。