With microthreads, it is possible to run tens of thousands of parallel processes on a moderately capable modern PC, and to switch between contexts hundreds of thousands of times every second.
有了微线程，我们就可能在目前中等性能的 PC 机上运行数以万计的并行进程，还可以每秒钟几十万次地在上下文之间切换。
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However once it leaves the city, the vehicle is able to switch to a dedicated concrete track which runs parallel to the motorway and accelerate to a cruising speed of around 150mph.
In particular, having a read-barrier allows you to switch to a simpler GC algorithm - and a simple algorithm can be more easily made parallel, scalable, concurrent and robust.