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Convert sampled call-stack profiler data into a flame tree and find the slowest function.

A practical build screen: turn a stream of sampled call stacks into a flame tree, then report self-time vs total-time per function. The trap is conflating the two times. Here is how to aggregate the tree and rank the hot functions.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

A practical build screen: turn a stream of sampled call stacks into a flame tree, then report self-time vs total-time per function. The trap is conflating the two times. Here is how to aggregate the tree and rank the hot functions.

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