Buildline merges Cargo and Ninja build profiles into a single wall-clock timeline

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A developer has released Buildline, an open-source tool that combines profiling output from multiple build systems — including Cargo and Ninja — into a single unified timeline. The tool addresses a common CI pain point where each build tool only profiles its own activity, leaving inter-tool gaps like toolchain downloads and dependency resolution invisible. Buildline wraps individual tool invocations and correlates them through a shared session file, outputting results in Chrome Trace Event Format readable by Perfetto. No central orchestrator or process interception is required, and the trace file remains valid and inspectable after every individual invocation. The project's core insight is that the biggest bottleneck in multi-tool builds often lies in the handoff between tools, not within any single one.

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