# 💾 PMAT Memory Management & Optimization - Comprehensive Guide
## Table of Contents
1. [Overview](#overview)
2. [Architecture](#architecture)
3. [Memory Commands](#memory-commands)
4. [Pool Management](#pool-management)
5. [Pressure Detection](#pressure-detection)
6. [Optimization Strategies](#optimization-strategies)
7. [CI/CD Integration](#cicd-integration)
8. [Best Practices](#best-practices)
## Overview
PMAT provides sophisticated memory management capabilities to optimize performance, prevent out-of-memory errors, and ensure efficient resource utilization across large-scale code analysis operations.
### Key Features
- **🎯 Real-time Monitoring**: Track memory usage across all PMAT components
- **🔄 Automatic Cleanup**: Smart garbage collection and cache eviction
- **📊 Pool Statistics**: Detailed memory pool analysis and optimization
- **⚠️ Pressure Detection**: Early warning system for memory constraints
- **🚀 Performance Tuning**: Adaptive memory allocation strategies
- **📈 Historical Tracking**: Memory usage patterns and trend analysis
## Architecture
```
┌────────────────────────────────────────────────────────────────┐
│ Memory Management System │
├────────────────────────────────────────────────────────────────┤
│ Core Components │
│ │
│ ┌──────────────┐ ┌──────────────┐ ┌──────────────┐ │
│ │ Monitor │ │ Allocator │ │ Cleanup │ │
│ │ Service │ │ Pools │ │ Engine │ │
│ └──────────────┘ └──────────────┘ └──────────────┘ │
│ │
│ ┌──────────────┐ ┌──────────────┐ ┌──────────────┐ │
│ │ Pressure │ │ Cache │ │ Metrics │ │
│ │ Detector │ │ Manager │ │ Collector │ │
│ └──────────────┘ └──────────────┘ └──────────────┘ │
└────────────────────────────────────────────────────────────────┘
```
### Memory Pools
PMAT uses specialized memory pools for different operations:
| **AST Pool** | Syntax tree parsing | 512 MB | Exponential |
| **Analysis Pool** | Code analysis operations | 256 MB | Linear |
| **Cache Pool** | Result caching | 1 GB | Adaptive |
| **Temp Pool** | Temporary allocations | 128 MB | Fixed |
| **String Pool** | String interning | 64 MB | Incremental |
## Memory Commands
### 1. Memory Statistics
```bash
# Show current memory usage
pmat memory stats
# Detailed statistics with breakdown
pmat memory stats --detailed
# Export statistics as JSON
pmat memory stats --format json > memory-stats.json
# Real-time monitoring (updates every second)
pmat memory stats --watch
```
**Example Output:**
```
Memory Statistics
═════════════════════════════════════════════
Total Allocated: 1,247 MB
Total Used: 892 MB (71.5%)
Total Available: 355 MB (28.5%)
Pool Breakdown:
├─ AST Pool: 312 MB / 512 MB (60.9%)
├─ Analysis Pool: 156 MB / 256 MB (60.9%)
├─ Cache Pool: 380 MB / 1024 MB (37.1%)
├─ Temp Pool: 28 MB / 128 MB (21.9%)
└─ String Pool: 16 MB / 64 MB (25.0%)
Pressure Level: LOW (0.28)
GC Last Run: 2 minutes ago
GC Next Run: In 8 minutes
```
### 2. Memory Cleanup
```bash
# Force immediate cleanup
pmat memory cleanup
# Cleanup with specific targets
pmat memory cleanup --target cache,temp
# Aggressive cleanup (may impact performance)
pmat memory cleanup --aggressive
# Cleanup and compact memory
pmat memory cleanup --compact
```
### 3. Memory Configuration
```bash
# Configure memory limits
pmat memory configure --max-total 4GB
# Set pool-specific limits
pmat memory configure --ast-pool 1GB --cache-pool 2GB
# Configure GC behavior
pmat memory configure --gc-interval 300 --gc-threshold 0.8
# Enable swap usage (when available)
pmat memory configure --allow-swap --swap-threshold 0.9
```
### 4. Pool Management
```bash
# Show pool statistics
pmat memory pools
# Detailed pool analysis
pmat memory pools --detailed
# Reset specific pool
pmat memory pools --reset ast
# Optimize pool sizes based on usage
pmat memory pools --optimize
```
### 5. Pressure Detection
```bash
# Check current memory pressure
pmat memory pressure
# Set pressure thresholds
pmat memory pressure --low 0.3 --medium 0.6 --high 0.8
# Enable automatic response to pressure
pmat memory pressure --auto-respond
# Test pressure response
pmat memory pressure --simulate high
```
## Pool Management
### AST Pool Optimization
```bash
# Analyze AST pool usage patterns
pmat memory pools --analyze ast
# Output:
# AST Pool Analysis
# ═════════════════════════════════
# Current Size: 512 MB
# Peak Usage: 487 MB (95.1%)
# Average Usage: 312 MB (60.9%)
# Fragmentation: 12.3%
#
# Recommendations:
# - Increase pool size to 768 MB
# - Enable defragmentation at 15% threshold
# - Consider pre-allocation for large files
# Apply recommendations
pmat memory configure --ast-pool 768MB --ast-defrag 0.15
```
### Cache Pool Management
```bash
# View cache statistics
pmat memory pools --cache-stats
# Clear specific cache types
pmat memory cleanup --target cache:tdg,cache:ast
# Configure cache eviction
pmat memory configure --cache-policy lru --cache-ttl 3600
```
## Pressure Detection
### Pressure Levels
| **LOW** | <30% | Normal operation | None required |
| **MEDIUM** | 30-60% | Passive cleanup | Monitor situation |
| **HIGH** | 60-80% | Active cleanup | Consider manual cleanup |
| **CRITICAL** | >80% | Emergency cleanup | Immediate intervention |
### Automatic Responses
```toml
# pmat.toml configuration
[memory.pressure]
auto_respond = true
[memory.pressure.responses.medium]
actions = ["cleanup_temp", "compact_strings"]
notify = false
[memory.pressure.responses.high]
actions = ["cleanup_all", "reduce_cache", "compact_all"]
notify = true
notification_cmd = "notify-send 'PMAT Memory Warning'"
[memory.pressure.responses.critical]
actions = ["emergency_cleanup", "dump_cache", "exit_gracefully"]
notify = true
save_state = true
```
## Optimization Strategies
### 1. Large Project Analysis
```bash
# Pre-configure for large projects (>1M LOC)
pmat memory configure --profile large-project
# This sets:
# - AST Pool: 2 GB
# - Analysis Pool: 1 GB
# - Cache Pool: 4 GB
# - Aggressive GC: Every 2 minutes
# - Incremental processing: Enabled
```
### 2. CI/CD Optimization
```bash
# Optimize for CI environments (limited memory)
pmat memory configure --profile ci-pipeline
# This sets:
# - Total limit: 2 GB
# - Minimal caching
# - Aggressive cleanup
# - Swap disabled
# - Streaming results
```
### 3. Interactive Development
```bash
# Optimize for IDE/editor integration
pmat memory configure --profile interactive
# This sets:
# - Fast response priority
# - Moderate caching
# - Background cleanup
# - Incremental updates
```
## CI/CD Integration
### GitHub Actions Example
```yaml
name: Code Analysis with Memory Management
on: [push, pull_request]
jobs:
analyze:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v3
- name: Install PMAT
run: cargo install pmat --locked
- name: Configure Memory for CI
run: |
pmat memory configure --profile ci-pipeline
pmat memory configure --max-total 3GB
- name: Run Analysis with Monitoring
run: |
# Start memory monitoring in background
pmat memory stats --watch --format json > memory-log.json &
MONITOR_PID=$!
# Run analysis
pmat analyze complexity . --top-files 100
pmat tdg . --enforce-thresholds
# Stop monitoring
kill $MONITOR_PID
- name: Check Memory Health
run: |
# Analyze memory usage patterns
pmat memory stats --analyze-log memory-log.json
# Fail if memory pressure was critical
if grep -q '"pressure_level":"CRITICAL"' memory-log.json; then
echo "Critical memory pressure detected during analysis"
exit 1
fi
- name: Upload Memory Report
uses: actions/upload-artifact@v3
with:
name: memory-analysis
path: memory-log.json
```
### Docker Configuration
```dockerfile
# Dockerfile with memory optimization
FROM rust:latest
# Install PMAT
RUN cargo install pmat --locked
# Configure memory limits
ENV PMAT_MEMORY_MAX=2GB
ENV PMAT_MEMORY_PROFILE=container
# Set up memory monitoring
HEALTHCHECK --interval=30s --timeout=3s \
# Configure entrypoint with memory management
ENTRYPOINT ["sh", "-c", "pmat memory configure --profile container && exec $@"]
```
## Best Practices
### 1. Regular Monitoring
```bash
# Add to your development workflow
alias pmat-status='pmat memory stats --format compact'
alias pmat-clean='pmat memory cleanup --target temp,cache'
alias pmat-optimize='pmat memory pools --optimize'
```
### 2. Pre-Analysis Configuration
```bash
#!/bin/bash
# prepare-analysis.sh
# Check available memory
AVAILABLE_MEM=$(free -m | awk '/^Mem:/{print $7}')
if [ $AVAILABLE_MEM -lt 2048 ]; then
echo "Low memory detected. Configuring conservative settings..."
pmat memory configure --profile low-memory
elif [ $AVAILABLE_MEM -lt 4096 ]; then
echo "Moderate memory available. Using balanced settings..."
pmat memory configure --profile balanced
else
echo "Ample memory available. Using performance settings..."
pmat memory configure --profile performance
fi
# Run analysis
pmat analyze complexity . --top-files 50
```
### 3. Memory Leak Detection
```bash
# Enable memory tracking
export PMAT_MEMORY_TRACK=1
# Run analysis
pmat analyze complexity src/
# Check for leaks
pmat memory stats --check-leaks
# Generate leak report
pmat memory stats --leak-report > leaks.json
```
### 4. Cache Management
```bash
# View cache usage
pmat memory pools --cache-stats
# Clear old cache entries (>7 days)
pmat memory cleanup --cache-age 7d
# Optimize cache based on hit rates
pmat memory pools --optimize-cache
```
### 5. Emergency Recovery
```bash
#!/bin/bash
# emergency-cleanup.sh
echo "Performing emergency memory cleanup..."
# Stop all PMAT processes
pkill -TERM pmat
# Clear all caches
rm -rf ~/.pmat/cache/*
rm -rf /tmp/pmat-*
# Reset memory configuration
pmat memory configure --reset
# Restart with minimal memory
pmat memory configure --profile minimal
echo "Memory cleanup complete. System reset to minimal configuration."
```
## Integration with PMAT Ecosystem
### Quality Gate Integration
```toml
# pmat.toml
[quality.gates.memory]
enabled = true
max_memory_usage = "4GB"
max_pressure_level = "HIGH"
require_cleanup_after = true
```
### MCP Tool Integration
```javascript
// Monitor memory during analysis
const memoryBefore = await mcp.callTool('pmat', 'memory_stats');
// Run heavy analysis
await mcp.callTool('pmat', 'analyze_complexity', {
path: '.',
deep_analysis: true
});
// Check memory after
const memoryAfter = await mcp.callTool('pmat', 'memory_stats');
// Cleanup if needed
if (memoryAfter.pressure_level === 'HIGH') {
await mcp.callTool('pmat', 'memory_cleanup', {
aggressive: true
});
}
```
### Performance Testing Integration
```bash
# Run performance test with memory monitoring
pmat test performance \
--scenario large-codebase \
--monitor memory \
--memory-limit 2GB \
--report memory-performance.json
```
## Troubleshooting
### Common Issues
1. **Out of Memory Errors**
```bash
pmat memory cleanup --aggressive
pmat memory configure --allow-swap
```
2. **Slow Performance**
```bash
pmat memory pressure
pmat memory pools --optimize
```
3. **Cache Misses**
```bash
pmat memory pools --cache-stats --detailed
pmat memory configure --cache-pool 2GB
```
---