Scaling & Performance

High-performance deployment strategies and optimization techniques for PHP MCP SDK applications.

Overview

This guide covers scaling PHP MCP SDK applications from single-server deployments to high-availability, multi-region architectures capable of handling millions of requests.

Performance Fundamentals

Benchmarking & Profiling

php

<?php
// src/Performance/Benchmark.php

class Benchmark
{
    private array $metrics = [];
    private float $startTime;
    private int $startMemory;

    public function start(): void
    {
        $this->startTime = microtime(true);
        $this->startMemory = memory_get_usage(true);
    }

    public function end(string $operation): array
    {
        $endTime = microtime(true);
        $endMemory = memory_get_usage(true);

        $metrics = [
            'operation' => $operation,
            'duration' => $endTime - $this->startTime,
            'memory_used' => $endMemory - $this->startMemory,
            'peak_memory' => memory_get_peak_usage(true),
            'timestamp' => time(),
        ];

        $this->metrics[] = $metrics;
        return $metrics;
    }

    public function benchmarkFunction(string $name, callable $function, int $iterations = 1000): array
    {
        $results = [];

        for ($i = 0; $i < $iterations; $i++) {
            $this->start();
            $function();
            $results[] = $this->end($name);
        }

        return $this->calculateStatistics($results);
    }

    private function calculateStatistics(array $results): array
    {
        $durations = array_column($results, 'duration');
        $memories = array_column($results, 'memory_used');

        return [
            'iterations' => count($results),
            'duration' => [
                'min' => min($durations),
                'max' => max($durations),
                'avg' => array_sum($durations) / count($durations),
                'median' => $this->median($durations),
            ],
            'memory' => [
                'min' => min($memories),
                'max' => max($memories),
                'avg' => array_sum($memories) / count($memories),
            ],
        ];
    }

    private function median(array $values): float
    {
        sort($values);
        $count = count($values);
        $middle = floor($count / 2);

        if ($count % 2 === 0) {
            return ($values[$middle - 1] + $values[$middle]) / 2;
        }

        return $values[$middle];
    }
}

Performance Profiler

php

<?php
// src/Performance/Profiler.php

class Profiler
{
    private array $profiles = [];
    private bool $enabled = true;

    public function profile(string $name, callable $callback)
    {
        if (!$this->enabled) {
            return $callback();
        }

        $startTime = microtime(true);
        $startMemory = memory_get_usage();

        try {
            $result = $callback();
        } finally {
            $endTime = microtime(true);
            $endMemory = memory_get_usage();

            $this->profiles[] = [
                'name' => $name,
                'duration' => $endTime - $startTime,
                'memory' => $endMemory - $startMemory,
                'timestamp' => time(),
            ];
        }

        return $result;
    }

    public function getProfiles(): array
    {
        return $this->profiles;
    }

    public function reset(): void
    {
        $this->profiles = [];
    }

    public function generateReport(): array
    {
        $grouped = [];

        foreach ($this->profiles as $profile) {
            $name = $profile['name'];

            if (!isset($grouped[$name])) {
                $grouped[$name] = [
                    'count' => 0,
                    'total_duration' => 0,
                    'total_memory' => 0,
                    'durations' => [],
                ];
            }

            $grouped[$name]['count']++;
            $grouped[$name]['total_duration'] += $profile['duration'];
            $grouped[$name]['total_memory'] += $profile['memory'];
            $grouped[$name]['durations'][] = $profile['duration'];
        }

        foreach ($grouped as $name => &$data) {
            $data['avg_duration'] = $data['total_duration'] / $data['count'];
            $data['avg_memory'] = $data['total_memory'] / $data['count'];

            sort($data['durations']);
            $count = count($data['durations']);
            $data['median_duration'] = $count % 2 === 0
                ? ($data['durations'][$count / 2 - 1] + $data['durations'][$count / 2]) / 2
                : $data['durations'][floor($count / 2)];
        }

        return $grouped;
    }
}

Caching Strategies

Multi-Layer Caching

php

<?php
// src/Cache/CacheManager.php

class CacheManager
{
    private array $layers = [];
    private array $stats = [];

    public function addLayer(string $name, CacheInterface $cache, int $ttl = 3600): void
    {
        $this->layers[$name] = [
            'cache' => $cache,
            'ttl' => $ttl,
        ];

        $this->stats[$name] = [
            'hits' => 0,
            'misses' => 0,
            'sets' => 0,
        ];
    }

    public function get(string $key): mixed
    {
        foreach ($this->layers as $name => $layer) {
            $value = $layer['cache']->get($key);

            if ($value !== null) {
                $this->stats[$name]['hits']++;

                // Populate higher-priority layers
                $this->populateUpstream($key, $value, $name);

                return $value;
            }

            $this->stats[$name]['misses']++;
        }

        return null;
    }

    public function set(string $key, mixed $value): bool
    {
        $success = true;

        foreach ($this->layers as $name => $layer) {
            $result = $layer['cache']->set($key, $value, $layer['ttl']);
            $success = $success && $result;

            if ($result) {
                $this->stats[$name]['sets']++;
            }
        }

        return $success;
    }

    public function remember(string $key, callable $callback): mixed
    {
        $value = $this->get($key);

        if ($value === null) {
            $value = $callback();
            $this->set($key, $value);
        }

        return $value;
    }

    private function populateUpstream(string $key, mixed $value, string $currentLayer): void
    {
        $found = false;

        foreach ($this->layers as $name => $layer) {
            if ($name === $currentLayer) {
                $found = true;
                continue;
            }

            if (!$found) {
                $layer['cache']->set($key, $value, $layer['ttl']);
            }
        }
    }

    public function getStats(): array
    {
        $totalStats = [];

        foreach ($this->stats as $name => $stats) {
            $total = $stats['hits'] + $stats['misses'];
            $hitRate = $total > 0 ? ($stats['hits'] / $total) * 100 : 0;

            $totalStats[$name] = array_merge($stats, [
                'hit_rate' => $hitRate,
                'total_requests' => $total,
            ]);
        }

        return $totalStats;
    }
}

Redis Cache Implementation

php

<?php
// src/Cache/RedisCache.php

class RedisCache implements CacheInterface
{
    private Redis $redis;
    private string $prefix;

    public function __construct(Redis $redis, string $prefix = 'mcp:')
    {
        $this->redis = $redis;
        $this->prefix = $prefix;
    }

    public function get(string $key): mixed
    {
        $value = $this->redis->get($this->prefix . $key);

        if ($value === false) {
            return null;
        }

        return unserialize($value);
    }

    public function set(string $key, mixed $value, int $ttl = 3600): bool
    {
        return $this->redis->setex(
            $this->prefix . $key,
            $ttl,
            serialize($value)
        );
    }

    public function delete(string $key): bool
    {
        return $this->redis->del($this->prefix . $key) > 0;
    }

    public function flush(): bool
    {
        $keys = $this->redis->keys($this->prefix . '*');

        if (empty($keys)) {
            return true;
        }

        return $this->redis->del($keys) > 0;
    }

    public function increment(string $key, int $value = 1): int
    {
        return $this->redis->incrBy($this->prefix . $key, $value);
    }

    public function decrement(string $key, int $value = 1): int
    {
        return $this->redis->decrBy($this->prefix . $key, $value);
    }
}

Connection Pooling

Database Connection Pool

php

<?php
// src/Database/ConnectionPool.php

class ConnectionPool
{
    private array $connections = [];
    private array $config;
    private int $maxConnections;
    private int $currentConnections = 0;

    public function __construct(array $config, int $maxConnections = 10)
    {
        $this->config = $config;
        $this->maxConnections = $maxConnections;
    }

    public function getConnection(): PDO
    {
        // Try to get an available connection
        foreach ($this->connections as $id => $connection) {
            if (!$connection['in_use']) {
                $this->connections[$id]['in_use'] = true;
                $this->connections[$id]['last_used'] = time();
                return $connection['pdo'];
            }
        }

        // Create new connection if under limit
        if ($this->currentConnections < $this->maxConnections) {
            return $this->createConnection();
        }

        // Wait for available connection
        return $this->waitForConnection();
    }

    public function releaseConnection(PDO $pdo): void
    {
        foreach ($this->connections as $id => &$connection) {
            if ($connection['pdo'] === $pdo) {
                $connection['in_use'] = false;
                $connection['last_used'] = time();
                break;
            }
        }
    }

    private function createConnection(): PDO
    {
        $dsn = "mysql:host={$this->config['host']};dbname={$this->config['database']};charset=utf8mb4";

        $pdo = new PDO(
            $dsn,
            $this->config['username'],
            $this->config['password'],
            [
                PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
                PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
                PDO::ATTR_PERSISTENT => false,
            ]
        );

        $id = uniqid();
        $this->connections[$id] = [
            'pdo' => $pdo,
            'in_use' => true,
            'created_at' => time(),
            'last_used' => time(),
        ];

        $this->currentConnections++;

        return $pdo;
    }

    private function waitForConnection(): PDO
    {
        $maxWait = 30; // 30 seconds
        $startTime = time();

        while ((time() - $startTime) < $maxWait) {
            foreach ($this->connections as $id => $connection) {
                if (!$connection['in_use']) {
                    $this->connections[$id]['in_use'] = true;
                    $this->connections[$id]['last_used'] = time();
                    return $connection['pdo'];
                }
            }

            usleep(100000); // Wait 100ms
        }

        throw new RuntimeException('Timeout waiting for database connection');
    }

    public function closeIdleConnections(int $maxIdleTime = 300): void
    {
        $now = time();

        foreach ($this->connections as $id => $connection) {
            if (!$connection['in_use'] && ($now - $connection['last_used']) > $maxIdleTime) {
                unset($this->connections[$id]);
                $this->currentConnections--;
            }
        }
    }

    public function getStats(): array
    {
        return [
            'total_connections' => $this->currentConnections,
            'max_connections' => $this->maxConnections,
            'active_connections' => count(array_filter($this->connections, fn($c) => $c['in_use'])),
            'idle_connections' => count(array_filter($this->connections, fn($c) => !$c['in_use'])),
        ];
    }
}

Load Balancing

Application Load Balancer

php

<?php
// src/LoadBalancer/LoadBalancer.php

class LoadBalancer
{
    private array $servers = [];
    private string $algorithm;
    private array $stats = [];

    public function __construct(string $algorithm = 'round_robin')
    {
        $this->algorithm = $algorithm;
    }

    public function addServer(string $id, string $host, int $port, int $weight = 1): void
    {
        $this->servers[$id] = [
            'host' => $host,
            'port' => $port,
            'weight' => $weight,
            'healthy' => true,
            'connections' => 0,
            'response_time' => 0,
            'last_check' => time(),
        ];

        $this->stats[$id] = [
            'requests' => 0,
            'errors' => 0,
            'total_response_time' => 0,
        ];
    }

    public function getServer(): array
    {
        $healthyServers = array_filter($this->servers, fn($server) => $server['healthy']);

        if (empty($healthyServers)) {
            throw new RuntimeException('No healthy servers available');
        }

        switch ($this->algorithm) {
            case 'round_robin':
                return $this->roundRobin($healthyServers);
            case 'weighted':
                return $this->weighted($healthyServers);
            case 'least_connections':
                return $this->leastConnections($healthyServers);
            case 'fastest_response':
                return $this->fastestResponse($healthyServers);
            default:
                throw new InvalidArgumentException("Unknown algorithm: {$this->algorithm}");
        }
    }

    private function roundRobin(array $servers): array
    {
        static $current = 0;

        $serverIds = array_keys($servers);
        $serverId = $serverIds[$current % count($serverIds)];
        $current++;

        return ['id' => $serverId] + $servers[$serverId];
    }

    private function weighted(array $servers): array
    {
        $totalWeight = array_sum(array_column($servers, 'weight'));
        $random = mt_rand(1, $totalWeight);

        $currentWeight = 0;
        foreach ($servers as $id => $server) {
            $currentWeight += $server['weight'];
            if ($random <= $currentWeight) {
                return ['id' => $id] + $server;
            }
        }

        // Fallback to first server
        $firstId = array_key_first($servers);
        return ['id' => $firstId] + $servers[$firstId];
    }

    private function leastConnections(array $servers): array
    {
        $minConnections = min(array_column($servers, 'connections'));

        $candidates = array_filter($servers, fn($server) => $server['connections'] === $minConnections);

        $serverId = array_rand($candidates);
        return ['id' => $serverId] + $candidates[$serverId];
    }

    private function fastestResponse(array $servers): array
    {
        $minResponseTime = min(array_column($servers, 'response_time'));

        $candidates = array_filter($servers, fn($server) => $server['response_time'] === $minResponseTime);

        $serverId = array_rand($candidates);
        return ['id' => $serverId] + $candidates[$serverId];
    }

    public function recordRequest(string $serverId, float $responseTime, bool $success = true): void
    {
        if (isset($this->stats[$serverId])) {
            $this->stats[$serverId]['requests']++;
            $this->stats[$serverId]['total_response_time'] += $responseTime;

            if (!$success) {
                $this->stats[$serverId]['errors']++;
            }
        }

        if (isset($this->servers[$serverId])) {
            $this->servers[$serverId]['response_time'] = $responseTime;
        }
    }

    public function healthCheck(): void
    {
        foreach ($this->servers as $id => &$server) {
            $healthy = $this->checkServerHealth($server['host'], $server['port']);
            $server['healthy'] = $healthy;
            $server['last_check'] = time();
        }
    }

    private function checkServerHealth(string $host, int $port): bool
    {
        $connection = @fsockopen($host, $port, $errno, $errstr, 5);

        if ($connection) {
            fclose($connection);
            return true;
        }

        return false;
    }

    public function getStats(): array
    {
        $stats = [];

        foreach ($this->stats as $id => $serverStats) {
            $avgResponseTime = $serverStats['requests'] > 0
                ? $serverStats['total_response_time'] / $serverStats['requests']
                : 0;

            $errorRate = $serverStats['requests'] > 0
                ? ($serverStats['errors'] / $serverStats['requests']) * 100
                : 0;

            $stats[$id] = array_merge($serverStats, [
                'avg_response_time' => $avgResponseTime,
                'error_rate' => $errorRate,
                'healthy' => $this->servers[$id]['healthy'],
            ]);
        }

        return $stats;
    }
}

Auto-Scaling

Kubernetes HPA Configuration

yaml

# kubernetes/hpa.yaml
apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: mcp-server-hpa
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: mcp-server
  minReplicas: 3
  maxReplicas: 50
  metrics:
    - type: Resource
      resource:
        name: cpu
        target:
          type: Utilization
          averageUtilization: 70
    - type: Resource
      resource:
        name: memory
        target:
          type: Utilization
          averageUtilization: 80
    - type: Pods
      pods:
        metric:
          name: mcp_requests_per_second
        target:
          type: AverageValue
          averageValue: "100"
  behavior:
    scaleUp:
      stabilizationWindowSeconds: 60
      policies:
        - type: Percent
          value: 100
          periodSeconds: 60
    scaleDown:
      stabilizationWindowSeconds: 300
      policies:
        - type: Percent
          value: 10
          periodSeconds: 60

Custom Metrics Auto-Scaler

php

<?php
// src/Scaling/AutoScaler.php

class AutoScaler
{
    private array $metrics = [];
    private array $rules = [];
    private callable $scaleCallback;

    public function __construct(callable $scaleCallback)
    {
        $this->scaleCallback = $scaleCallback;
    }

    public function addRule(string $name, array $rule): void
    {
        $this->rules[$name] = $rule;
    }

    public function recordMetric(string $name, float $value): void
    {
        if (!isset($this->metrics[$name])) {
            $this->metrics[$name] = [];
        }

        $this->metrics[$name][] = [
            'value' => $value,
            'timestamp' => time(),
        ];

        // Keep only last 100 measurements
        if (count($this->metrics[$name]) > 100) {
            array_shift($this->metrics[$name]);
        }
    }

    public function evaluate(): array
    {
        $decisions = [];

        foreach ($this->rules as $name => $rule) {
            $decision = $this->evaluateRule($name, $rule);
            if ($decision['action'] !== 'none') {
                $decisions[] = $decision;
            }
        }

        return $decisions;
    }

    private function evaluateRule(string $name, array $rule): array
    {
        $metric = $rule['metric'];
        $threshold = $rule['threshold'];
        $action = $rule['action'];
        $cooldown = $rule['cooldown'] ?? 300; // 5 minutes

        if (!isset($this->metrics[$metric])) {
            return ['rule' => $name, 'action' => 'none', 'reason' => 'No metric data'];
        }

        // Check cooldown
        if (isset($rule['last_action']) && (time() - $rule['last_action']) < $cooldown) {
            return ['rule' => $name, 'action' => 'none', 'reason' => 'Cooldown period'];
        }

        $recentMetrics = array_filter(
            $this->metrics[$metric],
            fn($m) => (time() - $m['timestamp']) <= ($rule['window'] ?? 300)
        );

        if (empty($recentMetrics)) {
            return ['rule' => $name, 'action' => 'none', 'reason' => 'No recent data'];
        }

        $average = array_sum(array_column($recentMetrics, 'value')) / count($recentMetrics);

        $shouldScale = match ($rule['operator'] ?? '>') {
            '>' => $average > $threshold,
            '<' => $average < $threshold,
            '>=' => $average >= $threshold,
            '<=' => $average <= $threshold,
            default => false,
        };

        if ($shouldScale) {
            $this->rules[$name]['last_action'] = time();

            // Execute scaling action
            ($this->scaleCallback)($action, [
                'rule' => $name,
                'metric' => $metric,
                'current_value' => $average,
                'threshold' => $threshold,
            ]);

            return [
                'rule' => $name,
                'action' => $action,
                'metric' => $metric,
                'current_value' => $average,
                'threshold' => $threshold,
                'reason' => 'Threshold exceeded',
            ];
        }

        return ['rule' => $name, 'action' => 'none', 'reason' => 'Threshold not met'];
    }
}

Database Optimization

Query Optimization

php

<?php
// src/Database/QueryOptimizer.php

class QueryOptimizer
{
    private PDO $pdo;
    private array $queryCache = [];
    private array $indexHints = [];

    public function __construct(PDO $pdo)
    {
        $this->pdo = $pdo;
    }

    public function optimizeQuery(string $sql, array $params = []): array
    {
        $queryHash = md5($sql . serialize($params));

        if (isset($this->queryCache[$queryHash])) {
            return $this->queryCache[$queryHash];
        }

        // Analyze query plan
        $explainSql = "EXPLAIN " . $sql;
        $stmt = $this->pdo->prepare($explainSql);
        $stmt->execute($params);
        $plan = $stmt->fetchAll(PDO::FETCH_ASSOC);

        // Suggest optimizations
        $suggestions = $this->analyzePlan($plan);

        $result = [
            'original_sql' => $sql,
            'plan' => $plan,
            'suggestions' => $suggestions,
            'optimized_sql' => $this->applyOptimizations($sql, $suggestions),
        ];

        $this->queryCache[$queryHash] = $result;

        return $result;
    }

    private function analyzePlan(array $plan): array
    {
        $suggestions = [];

        foreach ($plan as $row) {
            // Check for full table scans
            if ($row['type'] === 'ALL' && $row['rows'] > 1000) {
                $suggestions[] = [
                    'type' => 'index',
                    'message' => "Consider adding an index on {$row['table']}.{$row['key']}",
                    'severity' => 'high',
                ];
            }

            // Check for filesort
            if (str_contains($row['Extra'] ?? '', 'Using filesort')) {
                $suggestions[] = [
                    'type' => 'index',
                    'message' => "Consider adding an index to avoid filesort on {$row['table']}",
                    'severity' => 'medium',
                ];
            }

            // Check for temporary tables
            if (str_contains($row['Extra'] ?? '', 'Using temporary')) {
                $suggestions[] = [
                    'type' => 'query',
                    'message' => "Query creates temporary table, consider optimization",
                    'severity' => 'medium',
                ];
            }
        }

        return $suggestions;
    }

    private function applyOptimizations(string $sql, array $suggestions): string
    {
        $optimizedSql = $sql;

        foreach ($suggestions as $suggestion) {
            switch ($suggestion['type']) {
                case 'index_hint':
                    $optimizedSql = $this->addIndexHint($optimizedSql, $suggestion['hint']);
                    break;
                case 'limit':
                    $optimizedSql = $this->addLimit($optimizedSql, $suggestion['limit']);
                    break;
            }
        }

        return $optimizedSql;
    }

    public function createIndex(string $table, array $columns, string $type = 'INDEX'): bool
    {
        $indexName = $table . '_' . implode('_', $columns) . '_idx';
        $columnList = implode(', ', array_map(fn($col) => "`{$col}`", $columns));

        $sql = "CREATE {$type} `{$indexName}` ON `{$table}` ({$columnList})";

        try {
            $this->pdo->exec($sql);
            return true;
        } catch (PDOException $e) {
            error_log("Failed to create index: " . $e->getMessage());
            return false;
        }
    }

    public function analyzeTable(string $table): array
    {
        $sql = "ANALYZE TABLE `{$table}`";
        $stmt = $this->pdo->query($sql);

        return $stmt->fetchAll(PDO::FETCH_ASSOC);
    }

    public function getSlowQueries(int $limit = 10): array
    {
        $sql = "
            SELECT query_time, lock_time, rows_sent, rows_examined, sql_text
            FROM mysql.slow_log
            ORDER BY query_time DESC
            LIMIT {$limit}
        ";

        $stmt = $this->pdo->query($sql);
        return $stmt->fetchAll(PDO::FETCH_ASSOC);
    }
}

Memory Management

Memory Pool

php

<?php
// src/Memory/MemoryPool.php

class MemoryPool
{
    private array $pools = [];
    private array $stats = [];

    public function createPool(string $name, int $blockSize, int $blockCount): void
    {
        $this->pools[$name] = [
            'block_size' => $blockSize,
            'block_count' => $blockCount,
            'available' => range(0, $blockCount - 1),
            'allocated' => [],
            'memory' => str_repeat("\0", $blockSize * $blockCount),
        ];

        $this->stats[$name] = [
            'allocations' => 0,
            'deallocations' => 0,
            'peak_usage' => 0,
            'current_usage' => 0,
        ];
    }

    public function allocate(string $poolName): ?int
    {
        if (!isset($this->pools[$poolName])) {
            throw new InvalidArgumentException("Pool '{$poolName}' does not exist");
        }

        $pool = &$this->pools[$poolName];

        if (empty($pool['available'])) {
            return null; // Pool exhausted
        }

        $blockId = array_shift($pool['available']);
        $pool['allocated'][$blockId] = time();

        $this->stats[$poolName]['allocations']++;
        $this->stats[$poolName]['current_usage']++;
        $this->stats[$poolName]['peak_usage'] = max(
            $this->stats[$poolName]['peak_usage'],
            $this->stats[$poolName]['current_usage']
        );

        return $blockId;
    }

    public function deallocate(string $poolName, int $blockId): bool
    {
        if (!isset($this->pools[$poolName])) {
            return false;
        }

        $pool = &$this->pools[$poolName];

        if (!isset($pool['allocated'][$blockId])) {
            return false;
        }

        unset($pool['allocated'][$blockId]);
        $pool['available'][] = $blockId;

        $this->stats[$poolName]['deallocations']++;
        $this->stats[$poolName]['current_usage']--;

        return true;
    }

    public function getMemoryAddress(string $poolName, int $blockId): int
    {
        if (!isset($this->pools[$poolName])) {
            throw new InvalidArgumentException("Pool '{$poolName}' does not exist");
        }

        $pool = $this->pools[$poolName];

        return $blockId * $pool['block_size'];
    }

    public function writeToBlock(string $poolName, int $blockId, string $data): bool
    {
        if (!isset($this->pools[$poolName])) {
            return false;
        }

        $pool = &$this->pools[$poolName];

        if (!isset($pool['allocated'][$blockId])) {
            return false;
        }

        if (strlen($data) > $pool['block_size']) {
            return false;
        }

        $offset = $blockId * $pool['block_size'];

        for ($i = 0; $i < strlen($data); $i++) {
            $pool['memory'][$offset + $i] = $data[$i];
        }

        return true;
    }

    public function readFromBlock(string $poolName, int $blockId, int $length = null): string
    {
        if (!isset($this->pools[$poolName])) {
            return '';
        }

        $pool = $this->pools[$poolName];

        if (!isset($pool['allocated'][$blockId])) {
            return '';
        }

        $offset = $blockId * $pool['block_size'];
        $length = $length ?? $pool['block_size'];

        return substr($pool['memory'], $offset, $length);
    }

    public function getPoolStats(string $poolName): array
    {
        if (!isset($this->pools[$poolName])) {
            return [];
        }

        $pool = $this->pools[$poolName];
        $stats = $this->stats[$poolName];

        return [
            'block_size' => $pool['block_size'],
            'block_count' => $pool['block_count'],
            'available_blocks' => count($pool['available']),
            'allocated_blocks' => count($pool['allocated']),
            'utilization' => (count($pool['allocated']) / $pool['block_count']) * 100,
            'stats' => $stats,
        ];
    }
}

CDN Integration

CDN Manager

php

<?php
// src/CDN/CdnManager.php

class CdnManager
{
    private array $providers = [];
    private string $defaultProvider;

    public function addProvider(string $name, CdnProviderInterface $provider): void
    {
        $this->providers[$name] = $provider;

        if (!isset($this->defaultProvider)) {
            $this->defaultProvider = $name;
        }
    }

    public function upload(string $file, string $path, string $provider = null): string
    {
        $provider = $provider ?? $this->defaultProvider;

        if (!isset($this->providers[$provider])) {
            throw new InvalidArgumentException("Provider '{$provider}' not found");
        }

        return $this->providers[$provider]->upload($file, $path);
    }

    public function getUrl(string $path, string $provider = null): string
    {
        $provider = $provider ?? $this->defaultProvider;

        if (!isset($this->providers[$provider])) {
            throw new InvalidArgumentException("Provider '{$provider}' not found");
        }

        return $this->providers[$provider]->getUrl($path);
    }

    public function invalidate(array $paths, string $provider = null): bool
    {
        $provider = $provider ?? $this->defaultProvider;

        if (!isset($this->providers[$provider])) {
            return false;
        }

        return $this->providers[$provider]->invalidate($paths);
    }

    public function getStats(string $provider = null): array
    {
        $provider = $provider ?? $this->defaultProvider;

        if (!isset($this->providers[$provider])) {
            return [];
        }

        return $this->providers[$provider]->getStats();
    }
}

interface CdnProviderInterface
{
    public function upload(string $file, string $path): string;
    public function getUrl(string $path): string;
    public function invalidate(array $paths): bool;
    public function getStats(): array;
}

Performance Monitoring

Real-time Metrics

php

<?php
// src/Monitoring/RealTimeMetrics.php

class RealTimeMetrics
{
    private Redis $redis;
    private string $prefix;

    public function __construct(Redis $redis, string $prefix = 'metrics:')
    {
        $this->redis = $redis;
        $this->prefix = $prefix;
    }

    public function recordMetric(string $name, float $value, array $tags = []): void
    {
        $timestamp = time();
        $key = $this->prefix . $name;

        // Store time series data
        $this->redis->zadd($key, $timestamp, json_encode([
            'value' => $value,
            'tags' => $tags,
            'timestamp' => $timestamp,
        ]));

        // Keep only last hour of data
        $this->redis->zremrangebyscore($key, 0, $timestamp - 3600);

        // Update aggregated metrics
        $this->updateAggregates($name, $value, $tags);
    }

    public function getMetrics(string $name, int $startTime, int $endTime): array
    {
        $key = $this->prefix . $name;

        $data = $this->redis->zrangebyscore($key, $startTime, $endTime);

        return array_map(fn($item) => json_decode($item, true), $data);
    }

    public function getAggregates(string $name, int $window = 300): array
    {
        $now = time();
        $startTime = $now - $window;

        $metrics = $this->getMetrics($name, $startTime, $now);

        if (empty($metrics)) {
            return ['count' => 0, 'avg' => 0, 'min' => 0, 'max' => 0];
        }

        $values = array_column($metrics, 'value');

        return [
            'count' => count($values),
            'avg' => array_sum($values) / count($values),
            'min' => min($values),
            'max' => max($values),
            'sum' => array_sum($values),
        ];
    }

    private function updateAggregates(string $name, float $value, array $tags): void
    {
        $minute = floor(time() / 60) * 60;

        // Update per-minute aggregates
        $aggregateKey = $this->prefix . 'agg:' . $name . ':' . $minute;

        $this->redis->multi();
        $this->redis->hincrby($aggregateKey, 'count', 1);
        $this->redis->hincrbyfloat($aggregateKey, 'sum', $value);
        $this->redis->expire($aggregateKey, 86400); // Keep for 24 hours
        $this->redis->exec();

        // Update min/max
        $current = $this->redis->hgetall($aggregateKey);

        if (!isset($current['min']) || $value < (float)$current['min']) {
            $this->redis->hset($aggregateKey, 'min', $value);
        }

        if (!isset($current['max']) || $value > (float)$current['max']) {
            $this->redis->hset($aggregateKey, 'max', $value);
        }
    }

    public function getTopMetrics(int $limit = 10): array
    {
        $pattern = $this->prefix . '*';
        $keys = $this->redis->keys($pattern);

        $metrics = [];

        foreach ($keys as $key) {
            if (strpos($key, ':agg:') !== false) {
                continue;
            }

            $name = str_replace($this->prefix, '', $key);
            $count = $this->redis->zcard($key);

            if ($count > 0) {
                $metrics[$name] = $count;
            }
        }

        arsort($metrics);

        return array_slice($metrics, 0, $limit, true);
    }
}

Best Practices

1. Performance Optimization

Profile before optimizing
Use appropriate caching strategies
Optimize database queries
Implement connection pooling

2. Scaling Strategies

Plan for horizontal scaling
Use load balancers effectively
Implement auto-scaling
Monitor resource utilization

3. Resource Management

Manage memory efficiently
Use connection pools
Implement proper cleanup
Monitor resource leaks

Next Steps

Deployment Strategies - Production deployment patterns
Monitoring & Observability - Performance monitoring
Security & Compliance - Security considerations for scaling

Scale your PHP MCP SDK applications to handle millions of requests! 🚀

Scaling & Performance ​

Overview ​

Performance Fundamentals ​

Benchmarking & Profiling ​

Performance Profiler ​

Caching Strategies ​

Multi-Layer Caching ​

Redis Cache Implementation ​

Connection Pooling ​

Database Connection Pool ​

Load Balancing ​

Application Load Balancer ​

Auto-Scaling ​

Kubernetes HPA Configuration ​

Custom Metrics Auto-Scaler ​

Database Optimization ​

Query Optimization ​

Memory Management ​

Memory Pool ​

CDN Integration ​

CDN Manager ​

Performance Monitoring ​

Real-time Metrics ​

Best Practices ​

1. Performance Optimization ​

2. Scaling Strategies ​

3. Resource Management ​

Next Steps ​