Cache Optimization

This guide covers advanced cache optimization strategies, performance tuning, and best practices for managing Launchpad's caching system in production environments.

Cache Architecture

Cache Hierarchy

Launchpad uses a multi-layered caching approach:

~/.cache/launchpad/
├── binaries/
│   ├── packages/          # Package-specific cache
│   │   ├── {domain}-{version}/
│   │   │   ├── package.tar.xz
│   │   │   └── extracted/
│   │   └── metadata.json
│   └── bun/               # Bun-specific optimized cache
│       ├── {version}      # Direct binary cache
│       └── checksums.json
└── temp/                  # Temporary download cache
    └── {download-id}/

Cache Key Strategy

Cache keys are generated using a deterministic approach:

Package Cache: {domain}-{version} (e.g., nodejs.org-20.0.0)
Bun Cache: {version} (e.g., 1.2.3)
Temporary Cache: {timestamp}-{hash} for downloads in progress

Performance Optimization

Cache Hit Optimization

1. Version Pinning Strategy

bash

# Instead of using latest (cache miss on updates)
launchpad install node@latest

# Use specific versions for better cache hits
launchpad install node@20.0.0 python@3.11.5

2. Batch Operations

bash

# Efficient: Single operation, shared cache lookups
launchpad install node@20 python@3.11 bun@1.2.3

# Less efficient: Multiple operations, repeated cache checks
launchpad install node@20
launchpad install python@3.11
launchpad install bun@1.2.3

3. Environment Consistency

yaml

# deps.yaml - Use exact versions for cache consistency
dependencies:
  node: 20.0.0
  python.org: 3.11.5
  bun.sh: 1.2.3

Cache Warming Strategies

Pre-populate Common Packages

bash

#!/bin/bash
# cache-warm.sh - Pre-populate cache with common packages

COMMON_PACKAGES=(
  "node@20.0.0"
  "node@18.19.0"
  "python@3.11.5"
  "python@3.10.12"
  "bun@1.2.3"
  "go@1.21.5"
)

for package in "${COMMON_PACKAGES[@]}"; do
  echo "Warming cache for $package..."
  launchpad install "$package" --cache-only 2>/dev/null || true
done

CI/CD Cache Strategy

yaml

# .github/workflows/cache-strategy.yml
name: Optimized Cache Strategy

jobs:
  setup:
    runs-on: ubuntu-latest
    steps:
      - name: Cache Launchpad packages
        uses: actions/cache@v3
        with:
          path: ~/.cache/launchpad
          key: launchpad-${{ runner.os }}-${{ hashFiles('deps.yaml') }}
          restore-keys: |
            launchpad-${{ runner.os }}-

      - name: Install dependencies
        run: |
          launchpad install

Cache Size Management

Monitoring Cache Growth

bash

#!/bin/bash
# cache-monitor.sh - Monitor cache size and growth

cache_size() {
  du -sh ~/.cache/launchpad 2>/dev/null | cut -f1 || echo "0B"
}

cache_files() {
  find ~/.cache/launchpad -type f 2>/dev/null | wc -l || echo "0"
}

echo "Cache size: $(cache_size)"
echo "Cache files: $(cache_files)"

# Detailed breakdown
echo "Package cache: $(du -sh ~/.cache/launchpad/binaries/packages 2>/dev/null | cut -f1 || echo '0B')"
echo "Bun cache: $(du -sh ~/.cache/launchpad/binaries/bun 2>/dev/null | cut -f1 || echo '0B')"

Automated Cache Cleanup

bash

#!/bin/bash
# cache-cleanup.sh - Automated cache maintenance

MAX_CACHE_SIZE_MB=1000
CACHE_DIR="$HOME/.cache/launchpad"

# Check current cache size
current_size=$(du -sm "$CACHE_DIR" 2>/dev/null | cut -f1 || echo "0")

if [ "$current_size" -gt "$MAX_CACHE_SIZE_MB" ]; then
  echo "Cache size ($current_size MB) exceeds limit ($MAX_CACHE_SIZE_MB MB)"

  # Clean old packages first (keep recent versions)
  find "$CACHE_DIR/binaries/packages" -type d -mtime +30 -exec rm -rf {} + 2>/dev/null

  # If still too large, clear entire cache
  new_size=$(du -sm "$CACHE_DIR" 2>/dev/null | cut -f1 || echo "0")
  if [ "$new_size" -gt "$MAX_CACHE_SIZE_MB" ]; then
    echo "Clearing entire cache..."
    launchpad cache:clear --force
  fi
fi

Selective Cache Retention

bash

#!/bin/bash
# selective-cleanup.sh - Keep only essential cached packages

KEEP_PACKAGES=(
  "nodejs.org-20.0.0"
  "python.org-3.11.5"
  "bun.sh-1.2.3"
)

# Clear cache but preserve essential packages
temp_dir=$(mktemp -d)

for package in "${KEEP_PACKAGES[@]}"; do
  if [ -d "$HOME/.cache/launchpad/binaries/packages/$package" ]; then
    cp -r "$HOME/.cache/launchpad/binaries/packages/$package" "$temp_dir/"
  fi
done

# Clear cache and restore essential packages
launchpad cache:clear --force
mkdir -p "$HOME/.cache/launchpad/binaries/packages"

for package in "${KEEP_PACKAGES[@]}"; do
  if [ -d "$temp_dir/$package" ]; then
    mv "$temp_dir/$package" "$HOME/.cache/launchpad/binaries/packages/"
  fi
done

rm -rf "$temp_dir"

Advanced Cache Strategies

Shared Cache Setup

bash

# Setup shared cache for team/CI environments
export LAUNCHPAD_CACHE_DIR="/shared/cache/launchpad"
mkdir -p "$LAUNCHPAD_CACHE_DIR"

# Symlink to shared cache
rm -rf ~/.cache/launchpad
ln -s "$LAUNCHPAD_CACHE_DIR" ~/.cache/launchpad

Cache Synchronization

bash

#!/bin/bash
# sync-cache.sh - Synchronize cache across environments

REMOTE_CACHE="user@server:/shared/cache/launchpad/"
LOCAL_CACHE="$HOME/.cache/launchpad/"

# Download shared cache
rsync -av --delete "$REMOTE_CACHE" "$LOCAL_CACHE"

# Upload local cache additions
rsync -av "$LOCAL_CACHE" "$REMOTE_CACHE"

Cache Validation and Integrity

Checksum Verification

bash

#!/bin/bash
# verify-cache.sh - Verify cache integrity

CACHE_DIR="$HOME/.cache/launchpad/binaries/packages"

for package_dir in "$CACHE_DIR"/*; do
  if [ -d "$package_dir" ]; then
    package_name=$(basename "$package_dir")

    # Check if package archive exists and is valid
    if [ -f "$package_dir/package.tar.xz" ]; then
      if ! tar -tf "$package_dir/package.tar.xz" >/dev/null 2>&1; then
        echo "Corrupted cache for $package_name, removing..."
        rm -rf "$package_dir"
      fi
    fi
  fi
done

Cache Repair

bash

#!/bin/bash
# repair-cache.sh - Repair corrupted cache entries

corrupted_packages=()

# Detect corrupted packages
while IFS= read -r -d '' package_dir; do
  package_name=$(basename "$package_dir")

  if [ -f "$package_dir/package.tar.xz" ]; then
    if ! tar -tf "$package_dir/package.tar.xz" >/dev/null 2>&1; then
      corrupted_packages+=("$package_name")
      rm -rf "$package_dir"
    fi
  fi
done < <(find "$HOME/.cache/launchpad/binaries/packages" -maxdepth 1 -type d -print0)

# Re-download corrupted packages
for package in "${corrupted_packages[@]}"; do
  echo "Re-caching $package..."
  # Extract package name and version
  domain=$(echo "$package" | cut -d'-' -f1-2)
  version=$(echo "$package" | cut -d'-' -f3-)

  launchpad install "$domain@$version" --force-download 2>/dev/null || true
done

Performance Monitoring

Cache Performance Metrics

bash

#!/bin/bash
# cache-metrics.sh - Collect cache performance metrics

CACHE_DIR="$HOME/.cache/launchpad"
METRICS_FILE="/tmp/launchpad-cache-metrics.json"

# Collect metrics
cache_size_bytes=$(du -sb "$CACHE_DIR" 2>/dev/null | cut -f1 || echo "0")
cache_files=$(find "$CACHE_DIR" -type f 2>/dev/null | wc -l || echo "0")
package_count=$(find "$CACHE_DIR/binaries/packages" -maxdepth 1 -type d 2>/dev/null | wc -l || echo "0")
bun_versions=$(find "$CACHE_DIR/binaries/bun" -type f 2>/dev/null | wc -l || echo "0")

# Calculate cache hit rate (requires instrumentation)
cache_hits=$(grep "cache hit" ~/.launchpad/logs/install.log 2>/dev/null | wc -l || echo "0")
cache_misses=$(grep "cache miss" ~/.launchpad/logs/install.log 2>/dev/null | wc -l || echo "0")
total_requests=$((cache_hits + cache_misses))

if [ "$total_requests" -gt 0 ]; then
  hit_rate=$(echo "scale=2; $cache_hits * 100 / $total_requests" | bc)
else
  hit_rate="0"
fi

# Generate metrics JSON
cat > "$METRICS_FILE" << EOF
{
  "timestamp": "$(date -u +%Y-%m-%dT%H:%M:%SZ)",
  "cache_size_bytes": $cache_size_bytes,
  "cache_files": $cache_files,
  "package_count": $package_count,
  "bun_versions": $bun_versions,
  "cache_hit_rate": $hit_rate,
  "cache_hits": $cache_hits,
  "cache_misses": $cache_misses
}
EOF

echo "Metrics saved to $METRICS_FILE"
cat "$METRICS_FILE"

Performance Benchmarking

bash

#!/bin/bash
# benchmark-cache.sh - Benchmark cache performance

PACKAGES=("node@20.0.0" "python@3.11.5" "bun@1.2.3")

echo "Benchmarking cache performance..."

# Clear cache for clean test
launchpad cache:clear --force >/dev/null 2>&1

# Benchmark cold cache (first install)
echo "Cold cache performance:"
for package in "${PACKAGES[@]}"; do
  start_time=$(date +%s.%N)
  launchpad install "$package" >/dev/null 2>&1
  end_time=$(date +%s.%N)
  duration=$(echo "$end_time - $start_time" | bc)
  echo "  $package: ${duration}s"
done

# Benchmark warm cache (reinstall)
echo "Warm cache performance:"
for package in "${PACKAGES[@]}"; do
  # Uninstall first
  launchpad uninstall "$package" >/dev/null 2>&1

  start_time=$(date +%s.%N)
  launchpad install "$package" >/dev/null 2>&1
  end_time=$(date +%s.%N)
  duration=$(echo "$end_time - $start_time" | bc)
  echo "  $package: ${duration}s"
done

Best Practices

Development Workflow

Use Specific Versions: Pin exact versions in deps.yaml for consistent cache hits
Batch Operations: Install multiple packages in single commands
Regular Monitoring: Check cache size weekly with launchpad cache:clear --dry-run
Selective Cleanup: Use --keep-cache when resetting environments

Production Deployment

Pre-warm Cache: Cache common packages before deployment
Shared Cache: Use shared cache directories in containerized environments
Cache Validation: Implement integrity checks in CI/CD pipelines
Size Limits: Set up automated cleanup when cache exceeds limits

Team Collaboration

Standardized Versions: Use team-wide deps.yaml files
Cache Sharing: Share cache in development environments
Documentation: Document cache strategies in project README
Monitoring: Set up team-wide cache performance monitoring

Troubleshooting

Common Cache Issues

Cache Corruption

bash

# Symptoms: Installation failures, corrupted archives
# Solution: Clear and rebuild cache
launchpad cache:clear --force
launchpad install your-packages

Disk Space Issues

bash

# Symptoms: "No space left on device" errors
# Solution: Clean cache and monitor size
launchpad cache:clear --dry-run  # Check size first
launchpad cache:clear --force    # Clean if needed

Permission Problems

bash

# Symptoms: Permission denied errors
# Solution: Fix cache directory permissions
sudo chown -R $(whoami) ~/.cache/launchpad
chmod -R 755 ~/.cache/launchpad

Performance Issues

Slow Cache Lookups

bash

# Check cache directory structure
find ~/.cache/launchpad -type f | wc -l

# If too many files, consider cleanup
launchpad cache:clear --force

Network vs Cache Performance

bash

# Compare download vs cache performance
time launchpad install node@20.0.0  # First time (download)
launchpad uninstall node@20.0.0
time launchpad install node@20.0.0  # Second time (cache)

Cache Management - Basic cache management commands
Performance Optimization - General performance tuning
Cross-platform Compatibility - Platform-specific considerations

Cache Optimization ​

Cache Architecture ​

Cache Hierarchy ​

Cache Key Strategy ​

Performance Optimization ​

Cache Hit Optimization ​

1. Version Pinning Strategy ​

2. Batch Operations ​

3. Environment Consistency ​

Cache Warming Strategies ​

Pre-populate Common Packages ​

CI/CD Cache Strategy ​

Cache Size Management ​

Monitoring Cache Growth ​

Automated Cache Cleanup ​

Selective Cache Retention ​

Advanced Cache Strategies ​

Multi-Environment Cache Sharing ​

Shared Cache Setup ​

Cache Synchronization ​

Cache Validation and Integrity ​

Checksum Verification ​

Cache Repair ​

Performance Monitoring ​

Cache Performance Metrics ​

Performance Benchmarking ​

Best Practices ​

Development Workflow ​

Production Deployment ​

Team Collaboration ​

Troubleshooting ​

Common Cache Issues ​

Cache Corruption ​

Disk Space Issues ​

Permission Problems ​

Performance Issues ​

Slow Cache Lookups ​

Network vs Cache Performance ​

Related Documentation ​

Cache Optimization

Cache Architecture

Cache Hierarchy

Cache Key Strategy

Performance Optimization

Cache Hit Optimization

1. Version Pinning Strategy

2. Batch Operations

3. Environment Consistency

Cache Warming Strategies

Pre-populate Common Packages

CI/CD Cache Strategy

Cache Size Management

Monitoring Cache Growth

Automated Cache Cleanup

Selective Cache Retention

Advanced Cache Strategies

Multi-Environment Cache Sharing

Shared Cache Setup

Cache Synchronization

Cache Validation and Integrity

Checksum Verification

Cache Repair

Performance Monitoring

Cache Performance Metrics

Performance Benchmarking

Best Practices

Development Workflow

Production Deployment

Team Collaboration

Troubleshooting

Common Cache Issues

Cache Corruption

Disk Space Issues

Permission Problems

Performance Issues

Slow Cache Lookups

Network vs Cache Performance

Related Documentation