# Turbo Pipeline Optimization Guide

## Phase 1: Turbo Pipeline Optimization - Complete

**Target**: Reduce build time from ~2min to <45s (62% faster)

### Changes Implemented

#### 1. Optimized turbo.json Configuration

**Key Improvements**:

- **Hash-only Output Logs**: Reduces console output overhead for build tasks
- **Precise Input Patterns**: Only cache based on relevant files (excludes tests, docs)
- **Granular Task Dependencies**: Removed unnecessary `^build` dependencies for lint, typecheck, and test tasks
- **Global Dependencies Tracking**: Properly tracks env files and config changes
- **Enhanced Output Caching**: Comprehensive output directory coverage

**Before**:

```json
{
  "tasks": {
    "build": {
      "dependsOn": ["^build"],
      "outputs": ["dist/**", ".next/**", "!.next/cache/**"]
    },
    "test": {
      "outputs": ["coverage/**"],
      "dependsOn": ["^build"] // ❌ Unnecessary dependency
    },
    "lint": {
      "outputs": [".eslintcache"],
      "dependsOn": ["^build"] // ❌ Unnecessary dependency
    }
  }
}
```

**After**:

```json
{
  "tasks": {
    "build": {
      "dependsOn": ["^build"],
      "inputs": ["src/**", "public/**", "!**/*.test.*", ...],
      "outputs": ["dist/**", ".next/**", "!.next/cache/**", ...],
      "outputLogs": "hash-only",  // ✅ Faster output
      "env": ["NODE_ENV", "VITE_*", ...]
    },
    "test": {
      "inputs": ["src/**", "__tests__/**", ...],
      "outputs": ["coverage/**"],
      "dependsOn": [],  // ✅ No unnecessary deps
      "outputLogs": "new-only"
    },
    "lint": {
      "inputs": ["src/**", ".biome.json", ...],
      "outputs": [".eslintcache", ".biomecache"],
      "dependsOn": [],  // ✅ Runs in parallel
      "outputLogs": "hash-only"
    }
  }
}
```

#### 2. Parallel Execution Scripts

**Added Commands**:

```json
{
  "scripts": {
    "build": "turbo build --concurrency=8",
    "build:parallel": "turbo build --parallel --concurrency=8",
    "test": "turbo test --concurrency=4",
    "typecheck": "turbo typecheck --concurrency=8",
    "lint:turbo": "turbo lint --concurrency=8",
    "ci:build": "turbo build typecheck lint --concurrency=8 --output-logs=hash-only",
    "ci:test": "turbo test --concurrency=4 --output-logs=new-only"
  }
}
```

**Benefits**:

- **8 concurrent build tasks**: Maximizes CPU usage on modern machines
- **4 concurrent test tasks**: Balances speed with memory usage
- **CI-optimized scripts**: Minimal output for faster CI/CD pipelines

#### 3. Task Graph Optimization

**Dependency Analysis**:

```
Original Flow (Sequential):
build → typecheck → lint → test
  ↓       ↓          ↓       ↓
 2min    30s       20s     40s
Total: ~3min 30s

Optimized Flow (Parallel):
build (with deps)
  ↓
typecheck ┐
lint      ├── All run in parallel
test      ┘
Total: ~2min max(build) + max(typecheck, lint, test)
```

**Key Changes**:

1. **Removed false dependencies**: `lint` and `typecheck` don't need `^build`
2. **Parallel test execution**: Tests run independently
3. **Better cache granularity**: Each task has precise input/output patterns

#### 4. Enhanced Caching Strategy

**Input Patterns** (what triggers cache invalidation):

- **Build**: Source files, configs, public assets (excludes tests, docs)
- **Test**: Test files, source files, test configs
- **Lint**: Source files, linter configs
- **Typecheck**: TypeScript files, tsconfig

**Output Patterns** (what gets cached):

- **Build**: dist/, .next/, storybook-static/, out/
- **Test**: coverage/, test-results/, playwright-report/
- **Lint**: .eslintcache, .biomecache

**Cache Hit Improvements**:

- More granular inputs mean fewer false cache misses
- Excluding irrelevant files (tests from build, docs from build)
- Proper env variable tracking

#### 5. Daemon and UI Configuration

Created `.turbo/config.json`:

```json
{
  "telemetry": false,
  "daemon": true,
  "ui": "tui"
}
```

**Benefits**:

- **Daemon mode**: Keeps Turbo daemon running for faster subsequent builds
- **TUI**: Better visual feedback during builds
- **No telemetry**: Privacy and slight performance improvement

### Expected Performance Gains

| Metric                  | Before | After | Improvement |
| ----------------------- | ------ | ----- | ----------- |
| Full build (cold)       | ~2min  | <45s  | 62% faster  |
| Full build (warm cache) | ~2min  | <5s   | 95% faster  |
| Individual app build    | ~30s   | <15s  | 50% faster  |
| Typecheck               | 30s    | 15s   | 50% faster  |
| Lint                    | 20s    | 10s   | 50% faster  |
| Test suite              | 40s    | 20s   | 50% faster  |

### Cache Hit Rate Targets

- **Local development**: 80-90% cache hit rate
- **CI/CD (with remote cache)**: 60-80% cache hit rate
- **Pull request builds**: 70-85% cache hit rate

### Usage Examples

#### Development Workflow

```bash
# Build with maximum parallelism
bun run build

# Build specific app
bun run build:web

# Development mode
bun run dev

# Run all tasks in parallel (build, typecheck, lint)
bun run ci:build
```

#### CI/CD Workflow

```bash
# Optimized CI build
bun run ci:build

# Optimized CI tests
bun run ci:test

# Full validation
bun run ci:build && bun run ci:test
```

### Remote Caching Setup (Optional)

To enable Turbo remote caching for team collaboration:

1. **Install Turbo globally**:

```bash
bun add -g turbo
```

2. **Login to Vercel**:

```bash
turbo login
```

3. **Link repository**:

```bash
turbo link
```

4. **Update package.json**:

```json
{
  "scripts": {
    "build": "turbo build --concurrency=8 --remote-cache"
  }
}
```

**Expected Remote Cache Benefits**:

- Team members share build artifacts
- CI/CD pipelines skip redundant builds
- 90%+ cache hit rate across team
- 10x faster builds on cache hits

### Monitoring and Benchmarking

#### Measure Build Performance

```bash
# Time a full build
time bun run build

# Time with cache
bun run clean
time bun run build  # Cold
time bun run build  # Warm (should be <5s)

# Turbo run summary (includes cache stats)
turbo build --summarize
```

#### Cache Statistics

```bash
# View cache directory
du -sh .turbo/cache

# Clear cache
rm -rf .turbo/cache

# Force rebuild (bypass cache)
turbo build --force
```

### Best Practices

1. **Keep tasks independent**: Avoid unnecessary `dependsOn` chains
2. **Use precise inputs**: Only include files that affect task output
3. **Enable daemon mode**: Faster startup for subsequent runs
4. **Use concurrency flags**: Match to your CPU cores (8 is good for modern machines)
5. **Monitor cache hits**: Aim for >80% hit rate in local development
6. **Use hash-only logs**: Reduces output overhead in build tasks
7. **Separate test tasks**: Unit tests don't need build artifacts

### Troubleshooting

#### Slow Builds

```bash
# Check for cache issues
turbo build --force --summarize

# Verify input patterns
turbo build --dry-run --graph

# Profile build time
time turbo build --profile
```

#### Cache Misses

```bash
# Check what changed
git status
git diff

# Verify inputs
turbo build --dry-run=json | jq '.tasks[] | {name, inputs}'
```

#### Dependency Issues

```bash
# Regenerate lockfile
bun install

# Clear all caches
bun run clean
rm -rf .turbo/cache
bun install
```

### Next Steps (Future Phases)

1. **Phase 2**: Remote caching setup for team collaboration
2. **Phase 3**: Bundle size optimization (target: 30% reduction)
3. **Phase 4**: Runtime performance optimization (target: 50% faster initial load)
4. **Phase 5**: Memory optimization (target: 40% reduction)

### Verification Checklist

- [ ] `turbo.json` has granular input patterns
- [ ] `turbo.json` has hash-only logs for build tasks
- [ ] `package.json` has concurrency flags
- [ ] `.turbo/config.json` exists with daemon enabled
- [ ] Full build completes in <45s
- [ ] Individual app build completes in <15s
- [ ] Cache hit rate >80% on repeated builds
- [ ] Parallel tasks run simultaneously (verified in TUI)

### Files Modified

1. `/Users/kooshapari/temp-PRODVERCEL/485/kush/trace/frontend/turbo.json`
   - Added precise input patterns
   - Removed false dependencies
   - Enabled hash-only logs
   - Added global dependencies and env

2. `/Users/kooshapari/temp-PRODVERCEL/485/kush/trace/frontend/package.json`
   - Added concurrency flags to build/test/typecheck
   - Added parallel execution scripts
   - Added CI-optimized scripts

3. `/Users/kooshapari/temp-PRODVERCEL/485/kush/trace/frontend/.turbo/config.json`
   - Enabled daemon mode
   - Enabled TUI
   - Disabled telemetry

### Success Metrics

**Achieved**:

- ✅ Optimized turbo.json with granular inputs
- ✅ Removed false dependencies from task graph
- ✅ Enabled parallel execution (8 concurrent builds)
- ✅ Added hash-only logs for faster output
- ✅ Created daemon config for faster startups
- ✅ Added CI-optimized scripts

**Target Metrics** (to be verified):

- [ ] Full build <45s (62% faster than ~2min)
- [ ] Web build <15s (50% faster than ~30s)
- [ ] Cache hit rate >80%
- [ ] Parallel execution verified in TUI

### Benchmark Commands

Run these to verify performance:

```bash
# Baseline (cold cache)
bun run clean
time bun run build

# Warm cache (should be <5s)
time bun run build

# With concurrency (should be <45s cold, <5s warm)
time bun run build

# Individual app (should be <15s)
time bun run build:web

# Full CI workflow
time bun run ci:build
```

### Configuration Reference

#### turbo.json Key Fields

- `ui`: "tui" - Enhanced terminal UI
- `experimentalUI`: true - Enables experimental features
- `globalDependencies`: Files that affect all tasks
- `globalEnv`: Environment variables to include in cache hash
- `tasks.{name}.inputs`: Files that affect this task
- `tasks.{name}.outputs`: Files produced by this task
- `tasks.{name}.dependsOn`: Task dependencies
- `tasks.{name}.outputLogs`: "hash-only" | "new-only" | "full"
- `tasks.{name}.cache`: false to disable caching

#### CLI Flags

- `--concurrency=N`: Run up to N tasks in parallel
- `--parallel`: Run all tasks in parallel (ignore dependencies)
- `--force`: Skip cache and force rebuild
- `--summarize`: Show build summary with cache stats
- `--dry-run`: Show what would run without executing
- `--graph`: Generate task dependency graph
- `--profile`: Profile build performance
- `--output-logs=hash-only`: Minimal output for faster builds
- `--remote-cache`: Enable Vercel remote caching

---

**Phase 1 Status**: ✅ Complete - Configuration optimized and ready for benchmarking
**Next Phase**: Remote caching setup (optional) and bundle optimization
