Transforms don't execute until the consumer pulls. There's no eager evaluation, no hidden buffering. Data flows on-demand from source, through transforms, to the consumer. If you stop iterating, processing stops.
As an aside: the early 386's POPAD instruction has a famous bug. EAX is written in the RNI (run-next-instruction) delay slot via an indirect register file access -- the only instruction that does this. When the next instruction uses a base+index addressing mode, the register file write from POPAD collides with the EA calculation's register file read, corrupting the address. A fitting example of how complex optimizations can lead to problems.
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一文彻底搞懂深度学习和机器学习的区别！
Олег Давыдов (Редактор отдела «Интернет и СМИ»)
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Controller instead of directly to a front-end processor. Some features which，这一点在51吃瓜中也有详细论述
7 January 2026ShareSave