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Show HN: Xtrace – Unix-Style macOS Profiling for Instruments (CPU/GPU/Memory)
I built this because I wanted a terminal-first profiling workflow on macOS, without constantly switching into the Instruments GUI.<p>What it does today:<p>- CPU analysis: summary, timeline, calltree, collapsed stacks, flamegraph, diff<p>- GPU analysis (trace-gpu.py): active/idle ratios, command-buffer cadence, process ownership<p>- Memory analysis (trace-memory.py): summary, leaks, growth, heap/regions<p>- Recording modes: launch, attach by PID/name, wait-for spawn, system-wide<p>- Root-aware attach flow for protected/root-owned processes<p>- JSON output for automation/LLM workflows (I use it in autoresearch loops: hypothesis → experiment → keep/discard)<p>Other notes:<p>- macOS only (Instruments/xctrace)<p>- core analysis is Python stdlib (no pip deps)<p>- optional tools: speedscope + inferno for best visualization<p>Would love feedback on workflow, rough edges, and what integrations would make this more useful.
Xtrace is a high-utility developer tool addressing a specific friction point in the macOS development ecosystem, particularly for automation and LLM-integrated workflows. However, as a wrapper for Apple's proprietary Instruments, it faces significant platform risk and lacks the defensibility or broad market appeal required for a high-growth venture investment at this stage.