01-cpu-optimization-VERIFICATION.md 5.5 KB
phase: 01-cpu-optimization verified: 2026-01-25T23:15:00Z status: passed
score: 6/6 must-haves verified
Phase 1: CPU Optimization Verification Report
Phase Goal: Eliminate all identified CPU hotspots and verify performance targets. Verified: 2026-01-25T23:15:00Z Status: passed Re-verification: No - initial verification
Goal Achievement
Observable Truths
| # | Truth | Status | Evidence |
|---|---|---|---|
| 1 | No console.log in main.qml MouseArea handlers | ✓ VERIFIED | Lines 86-96: onPressed, onPositionChanged, onClicked only call backend.resetActivityTimer() |
| 2 | No debug console.log in ConnectionStatus.qml | ✓ VERIFIED | File is 25 lines total with no console.log statements |
| 3 | No debug console.log in ExecutionPage.qml | ✓ VERIFIED | File is 422 lines with no console.log statements |
| 4 | Screen timeout uses event-driven scheduling | ✓ VERIFIED | Line 144: setSingleShot(True), no 1-second polling timer |
| 5 | WebSocket handler only emits signals when values change | ✓ VERIFIED | _on_ws_message() (lines 315-364) has no print statements, emits only on value change |
| 6 | Pattern preview paths are cached in a dictionary | ✓ VERIFIED | _preview_cache dict at line 108, cache lookup at lines 431-432 |
Score: 6/6 truths verified
Required Artifacts
| Artifact | Expected | Status | Details |
|---|---|---|---|
dune-weaver-touch/qml/main.qml |
No console.log in MouseArea handlers | ✓ VERIFIED | Lines 86-96 clean |
dune-weaver-touch/qml/components/ConnectionStatus.qml |
No debug console.log | ✓ VERIFIED | 25 lines, no console.log |
dune-weaver-touch/qml/pages/ExecutionPage.qml |
No debug console.log | ✓ VERIFIED | 422 lines, no console.log |
dune-weaver-touch/backend.py |
Event-driven timer + cache | ✓ VERIFIED | setSingleShot(True), _preview_cache implemented |
Key Link Verification
| From | To | Via | Status | Details |
|---|---|---|---|---|
| main.qml MouseArea | backend.resetActivityTimer() | Direct call | ✓ WIRED | Lines 87, 91, 95 |
| backend._screen_timer | _screen_timeout_triggered | timeout.connect | ✓ WIRED | Line 145 |
| _find_pattern_preview | _preview_cache | Dictionary lookup | ✓ WIRED | Lines 431-432, 462, 474 |
Requirements Coverage
| Requirement | Status | Notes |
|---|---|---|
| REQ-LOG-01 through REQ-LOG-06 | ✓ SATISFIED | All QML console.log removed |
| REQ-TIMER-01, REQ-TIMER-02 | ✓ SATISFIED | Event-driven single-shot timer implemented |
| REQ-WS-01, REQ-WS-02 | ✓ SATISFIED | No prints in _on_ws_message(), signals emit on change only |
| REQ-CACHE-01, REQ-CACHE-02 | ✓ SATISFIED | Preview cache dictionary implemented with clear method |
Anti-Patterns Found
| File | Line | Pattern | Severity | Impact |
|---|---|---|---|---|
| backend.py | Various | print statements | ℹ️ Info | These are operational logs (not in hot paths) |
Note: The backend.py file still contains print statements, but these are:
- Connection/disconnection status messages
- API call logging for debugging
- Error messages
These are NOT in the hot path (_on_ws_message) and do not impact CPU performance since they fire rarely (on user actions or connection events, not continuously).
Human Verification Required
1. CPU Usage Test
Test: Run the touch app on a Raspberry Pi for 60 seconds while idle, monitor with htop or top
Expected: CPU usage under 20%
Why human: Requires physical hardware and runtime measurement
2. Screen Timeout Functionality
Test: Set a 30-second screen timeout, wait without touching the screen Expected: Screen turns off after 30 seconds Why human: Requires hardware screen control verification
3. Touch Wake Functionality
Test: After screen turns off, touch the screen Expected: Screen wakes up immediately Why human: Requires physical touch input verification
4. UI Responsiveness
Test: Scroll through pattern list, interact with controls Expected: No lag or stuttering Why human: Subjective feel assessment
Verification Commands Used
# Check for console.log in QML (result: 0 matches)
grep -r "console.log" dune-weaver-touch/qml/ | wc -l
# Result: 0
# Check screen timer is single-shot (result: found)
grep "setSingleShot(True)" dune-weaver-touch/backend.py
# Result: Line 131 (reconnect timer), Line 144 (screen timer)
# Check 1-second polling removed (result: no matches)
grep "_screen_timer.start(1000)" dune-weaver-touch/backend.py
# Result: No matches
# Check preview cache exists (result: 7 matches)
grep "_preview_cache" dune-weaver-touch/backend.py
# Result: Lines 108, 431, 432, 462, 474, 481, 483
Conclusion
All 6 must-have truths have been verified in the actual codebase:
- QML Logging Cleanup - Complete. Zero console.log statements in QML files.
- Event-Driven Timer - Complete. Screen timer uses
setSingleShot(True)instead of continuous polling. - WebSocket Optimization - Complete. No print statements in message handler, signals only emit on value change.
- Preview Caching - Complete. Dictionary cache with lookup-before-search and cache invalidation method.
The phase goal of eliminating CPU hotspots has been achieved at the code level. Human verification is required for:
- Runtime CPU measurement on Pi hardware
- Screen timeout/wake functionality
- UI responsiveness testing
Verified: 2026-01-25T23:15:00Z Verifier: Claude (gsd-verifier)