chore: wip

Author: iamzjohn

packages/benchmark/README.md

@@ -1,22 +1,96 @@
-# File Detection Performance Comparison
+# Launchpad Performance Benchmarks
 
-This benchmark compares the performance of different approaches for detecting project configuration files in directory trees, specifically comparing the current shell-based implementation with custom Bun/TypeScript alternatives.
+This document contains performance benchmarks for Launchpad's caching system and file detection mechanisms.
 
 ## 🎯 Key Findings
 
+### Cache Performance
+The enhanced caching system delivers **10,000x - 50,000x performance improvements**:
+
+- **Cache Hit**: Sub-microsecond (<0.001ms) - **99.9%+ faster than disk I/O**
+- **Cache Miss**: Sub-microsecond (<0.001ms) - Instant fallback
+- **Cache Write**: 7.3ms avg (debounced, non-blocking)
+
+### File Detection Performance
 The Bun-based approaches are **dramatically faster** than the current shell implementation:
 
-- **Bun Direct (sync)**: **99.2% faster** on average
-- **Bun Glob (async)**: **98.9% faster** on average
+- **Bun Direct (sync)**: **99.7% faster** on average
+- **Shell (current)**: 16-105ms depending on depth
 
 ## 📊 Detailed Results
 
-| Test Scenario | Bun Direct | Bun Glob | Shell (Current) | Speed Improvement |
-|---------------|------------|----------|-----------------|-------------------|
-| Shallow (3 levels) | 0.12ms | 0.27ms | 24.85ms | **99.5% faster** |
-| Medium (7 levels) | 0.31ms | 0.74ms | 49.96ms | **99.4% faster** |
-| Deep (15 levels) | 0.72ms | 0.94ms | 89.68ms | **99.2% faster** |
-| Very Deep (25 levels) | 1.39ms | 1.53ms | 143.67ms | **99.0% faster** |
+### Cache Performance Benchmark
+
+Run with: `launchpad benchmark:cache --iterations 50000`
+
+```text
+🚀 Cache Performance Benchmark
+
+Testing in-memory cache lookup performance...
+
+Cache lookup (hit)     : 0.000ms avg (3.8ms total, 50000 iterations)
+Cache lookup (miss)    : 0.000ms avg (2.3ms total, 50000 iterations)
+Cache write            : 7.251ms avg (36256.5ms total, 5000 iterations)
+
+📊 Cache Performance Summary:
+──────────────────────────────────────────────────
+Cache Hit:  0.000ms avg (sub-microsecond)
+Cache Miss: 0.000ms avg (sub-microsecond)
+Cache Write: 7.251ms avg (debounced, non-blocking)
+
+🎯 Target: <0.001ms for cache hits (sub-microsecond)
+✅ Status: PASSED
+```
+
+**Key Metrics:**
+
+- **Cache Hit**: Sub-microsecond (0.000ms) - **99.9%+ faster than disk I/O**
+- **Cache Miss**: Sub-microsecond (0.000ms) - Instant fallback
+- **Cache Write**: 7.3ms avg (debounced, doesn't block shell)
+
+#### Real-World Impact
+
+##### Scenario 1: cd within same project (most common)
+
+- Before: ~10-50ms (directory walk + grep)
+- After: **<0.001ms** (path prefix check, no system calls)
+- **Improvement: 10,000x - 50,000x faster**
+
+##### Scenario 2: cd to cached project
+
+- Before: ~10-50ms (directory walk + grep)
+- After: **<0.001ms** (in-memory hash map lookup)
+- **Improvement: 10,000x - 50,000x faster**
+
+##### Scenario 3: cd to new project (cache miss)
+
+- Before: ~10-50ms (shell-based directory walk)
+- After: ~0.1-0.3ms (Bun direct file detection)
+- **Improvement: 100x - 500x faster**
+
+### File Detection Performance Benchmark
+
+Run with: `launchpad benchmark:file-detection`
+
+```text
+📈 PERFORMANCE SUMMARY
+════════════════════════════════════════════════════════════════════════════════
+Test Case           Bun Direct     Shell          Improvement
+────────────────────────────────────────────────────────────────────────────────
+3 levels            0.04ms         16.52ms        +99.7% faster
+7 levels            0.08ms         32.47ms        +99.8% faster
+15 levels           0.16ms         67.54ms        +99.8% faster
+25 levels           0.27ms         104.91ms       +99.7% faster
+
+🎯 RECOMMENDATION: Use Bun Direct approach for significant performance gains
+```
+
+| Test Scenario | Bun Direct | Shell (Current) | Speed Improvement |
+|---------------|------------|-----------------|-------------------|
+| Shallow (3 levels) | 0.04ms | 16.52ms | **99.7% faster (416x)** |
+| Medium (7 levels) | 0.08ms | 32.47ms | **99.8% faster (406x)** |
+| Deep (15 levels) | 0.16ms | 67.54ms | **99.8% faster (421x)** |
+| Very Deep (25 levels) | 0.27ms | 104.91ms | **99.7% faster (387x)** |
 
 ## 🔍 Analysis
 
@@ -138,21 +212,51 @@ The file detection is used in:
 3. **Caching**: Both approaches benefit from the existing caching mechanism
 4. **Error Handling**: Ensure graceful fallback between approaches
 
-## 🧪 Running the Benchmark
+## 🧪 Running the Benchmarks
+
+### Cache Performance Benchmark
+
+```bash
+# Default (10,000 iterations)
+launchpad benchmark:cache
+
+# High precision (50,000 iterations)
+launchpad benchmark:cache --iterations 50000
+
+# JSON output
+launchpad benchmark:cache --json
+```
+
+### File Detection Performance Benchmark
 
 ```bash
-cd packages/launchpad/benchmark
-bun install
-bun run file-detection-comparison.ts
+# Default depths (3, 7, 15, 25)
+launchpad benchmark:file-detection
+
+# Custom depths
+launchpad benchmark:file-detection --depths 5,10,20
+
+# JSON output
+launchpad benchmark:file-detection --json
 ```
 
-The benchmark creates temporary directory structures at various depths and measures the time to find project files, providing comprehensive performance data across different scenarios.
+The benchmarks create test scenarios and measure performance across different conditions, providing comprehensive performance data.
 
 ## 📈 Conclusion
 
-The performance difference is **dramatic and consistent**:
-- Bun approaches are **~100x faster** than the shell approach
+The performance improvements are **dramatic and consistent across all areas**:
+
+### Cache System
+
+- **10,000x - 50,000x faster** for cached project lookups
+- Sub-microsecond cache hit times (<0.001ms)
+- Eliminates the primary bottleneck in shell integration
+- Zero disk I/O for subsequent lookups after initial cache load
+
+### File Detection
+
+- Bun approaches are **~400x faster** than the shell approach (99.7%+ improvement)
 - The performance gap **increases** with directory depth
 - Implementation complexity is **minimal** for the Bun direct approach
 
-**Recommendation**: Implement the hybrid approach with Bun Direct as primary and shell as fallback for maximum performance while maintaining compatibility.
+**Recommendation**: The enhanced caching system combined with Bun direct file detection delivers unprecedented performance for shell integration, making directory changes effectively instant in most scenarios.