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Get Started Free →Profile macOS processes (CPU hot spots, hangs, "what is X doing?"). Wraps sample/spindump/xctrace and prints a compact text summary or speedscope/flamegraph data.
| Test case | Without → With | Effect | Δ tokens | Δ turns |
|---|---|---|---|---|
| case-01 | ✗→✓ | ▲ Improved | -43% | 0% |
| case-02 | ✗→✓ | ▲ Improved | -56% | 0% |
| case-03 | ✗→✓ | ▲ Improved | 32% | 0% |
| case-04 | ✗→✓ | ▲ Improved | -62% | 0% |
| case-05 | ✗→✓ | ▲ Improved | -43% | 0% |
Default invocation prints a bounded text summary to stdout — paste it back.
bash# What is process X doing? (one process, wall-clock, 5s) macprof sample <pid|name> 5 -o - # Where is CPU time going system-wide? (true on-CPU, needs Xcode CL tools) macprof xctrace 5 -o - macprof xctrace 5 --attach <pid|name> -o - # What is everything blocked on? (wall-clock, all procs, needs sudo) macprof spindump 5 -o - --keep-idle # Files for the user to open interactively macprof xctrace 10 -o cpu.speedscope.json # → drop on https://speedscope.app macprof spindump 10 # → cwd: .folded + .speedscope.json
Pick sampler by question:
| question | command | | --------------------------------- | --------------- | | process hung / spinning, why? | sample <name> | | what's burning CPU right now? | xctrace | | system slow, who's blocking whom? | spindump |
Flags: -o - stdout summary · -o x.json speedscope · -o x.folded flamegraph · --keep-idle include blocked threads · --keep-raw keep raw report.
Pair with heap <pid> (object counts) and lsof -p <pid> (open files/dirs) when memory, not CPU, is the symptom.
Other measured skills in the registry, with their headline benchmark lift.