// Signal how many bytes we wrote
Trump eyes Venezuela visit – but obstacles to his oil plan remain
，这一点在heLLoword翻译官方下载中也有详细论述
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The solver takes the LLB graph and executes it. Each vertex in the DAG is content-addressed, so if you’ve already built a particular step with the same inputs, BuildKit skips it entirely. This is why BuildKit is fast: it doesn’t just cache layers linearly like the old Docker builder. It caches at the operation level across the entire graph, and it can execute independent branches in parallel.