native-app-performance

Included with Lifetime

$97 forever

Native macOS/iOS app performance profiling via xctrace/Time Profiler and CLI-only analysis of Instruments traces. Use when asked to profile, attach, record, or analyze Instruments .trace files, find hotspots, or optimize native app performance without opening Instruments UI.

Designscripts

What this skill does


# Native App Performance (CLI-only)

Goal: record Time Profiler via `xctrace`, extract samples, symbolicate, and propose hotspots without opening Instruments.

## Quick start (CLI)

1) Record Time Profiler (attach):

```bash
# Start app yourself, then attach
xcrun xctrace record --template 'Time Profiler' --time-limit 90s --output /tmp/App.trace --attach <pid>
```

2) Record Time Profiler (launch):

```bash
xcrun xctrace record --template 'Time Profiler' --time-limit 90s --output /tmp/App.trace --launch -- /path/App.app/Contents/MacOS/App
```

3) Extract time samples:

```bash
scripts/extract_time_samples.py --trace /tmp/App.trace --output /tmp/time-sample.xml
```

4) Get load address for symbolication:

```bash
# While app is running
vmmap <pid> | rg -m1 "__TEXT" -n
```

5) Symbolicate + rank hotspots:

```bash
scripts/top_hotspots.py --samples /tmp/time-sample.xml \
  --binary /path/App.app/Contents/MacOS/App \
  --load-address 0x100000000 --top 30
```

## Workflow notes

- Always confirm you’re profiling the correct binary (local build vs /Applications). Prefer direct binary path for `--launch`.
- Ensure you trigger the slow path during capture (menu open/close, refresh, etc.).
- If stacks are empty, capture longer or avoid idle sections.
- `xcrun xctrace help record` and `xcrun xctrace help export` show correct flags.

## Included scripts

- `scripts/record_time_profiler.sh`: record via attach or launch.
- `scripts/extract_time_samples.py`: export time-sample XML from a trace.
- `scripts/top_hotspots.py`: symbolicate and rank top app frames.

## Gotchas

- ASLR means you must use the runtime `__TEXT` load address from `vmmap`.
- If using a new build, update the `--binary` path; symbols must match the trace.
- CLI-only flow: no need to open Instruments if stacks are symbolicated via `atos`.

Files: 5

Size: 8.8 KB

Complexity: 33/100

Category: Design

Source: https://github.com/leoyeai/openclaw-master-skills/tree/main/skills/native-app-performance

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