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* Real-time performance monitoring and metrics collection
*/
import { createCacheManager, cacheManager as globalCache } from './cache-manager.js';
// Create a dedicated cache instance for monitoring
const monitorCache = createCacheManager({
maxSize: 1000,
ttlMs: 300000 // 5 minutes
});
export class PerformanceMonitor {
constructor() {
this.metrics = {
renderTimes: [],
componentCounts: new Map(),
memoryUsage: [],
cachePerformance: [],
errors: []
};
this.startTime = Date.now();
this.isMonitoring = false;
}
start() {
this.isMonitoring = true;
this.collectSystemMetrics();
console.log('đ Performance monitoring started');
}
stop() {
this.isMonitoring = false;
console.log('âšī¸ Performance monitoring stopped');
return this.generateReport();
}
// Measure render performance
measureRender(component, props, renderFn) {
const startTime = process.hrtime.bigint();
const startMemory = process.memoryUsage();
try {
const result = renderFn(component, props);
const endTime = process.hrtime.bigint();
const endMemory = process.memoryUsage();
const renderTimeMs = Number(endTime - startTime) / 1000000;
const memoryDelta = endMemory.heapUsed - startMemory.heapUsed;
this.recordRenderMetric({
component: this.getComponentName(component),
renderTime: renderTimeMs,
memoryDelta,
resultSize: typeof result === 'string' ? result.length : 0
});
return result;
} catch (error) {
this.recordError(error, component);
throw error;
}
}
recordRenderMetric(metric) {
this.metrics.renderTimes.push({
...metric,
timestamp: Date.now()
});
// Update component usage stats
const current = this.metrics.componentCounts.get(metric.component) || 0;
this.metrics.componentCounts.set(metric.component, current + 1);
// Keep only recent metrics
if (this.metrics.renderTimes.length > 1000) {
this.metrics.renderTimes = this.metrics.renderTimes.slice(-1000);
}
}
recordError(error, component) {
this.metrics.errors.push({
error: error.message,
component: this.getComponentName(component),
stack: error.stack,
timestamp: Date.now()
});
}
collectSystemMetrics() {
if (!this.isMonitoring) return;
const memUsage = process.memoryUsage();
this.metrics.memoryUsage.push({
timestamp: Date.now(),
heapUsed: memUsage.heapUsed,
heapTotal: memUsage.heapTotal,
external: memUsage.external,
rss: memUsage.rss
});
// Get cache stats if available
if (monitorCache) {
const cacheStats = monitorCache.getStats();
this.metrics.cachePerformance.push({
timestamp: Date.now(),
...cacheStats
});
}
// Keep only recent system metrics
if (this.metrics.memoryUsage.length > 100) {
this.metrics.memoryUsage = this.metrics.memoryUsage.slice(-100);
}
setTimeout(() => this.collectSystemMetrics(), 5000); // Every 5 seconds
}
getComponentName(component) {
if (typeof component === 'function') {
return component.name || 'AnonymousFunction';
}
if (typeof component === 'object' && component) {
const keys = Object.keys(component);
return keys.length > 0 ? keys[0] : 'EmptyObject';
}
return 'Unknown';
}
generateReport() {
const now = Date.now();
const uptimeMs = now - this.startTime;
return {
summary: {
uptime: `${(uptimeMs / 1000).toFixed(2)}s`,
totalRenders: this.metrics.renderTimes.length,
averageRenderTime: this.calculateAverageRenderTime(),
errorRate: this.calculateErrorRate(),
memoryEfficiency: this.calculateMemoryEfficiency()
},
performance: {
renderTimes: this.getRenderTimeStats(),
topComponents: this.getTopComponentsByUsage(),
slowestComponents: this.getSlowestComponents(),
memoryTrends: this.getMemoryTrends()
},
caching: globalCache.getStats(),
recommendations: this.generatePerformanceRecommendations(),
rawMetrics: {
recentRenders: this.metrics.renderTimes.slice(-50),
recentErrors: this.metrics.errors.slice(-10),
memorySnapshots: this.metrics.memoryUsage.slice(-20)
}
};
}
calculateAverageRenderTime() {
if (this.metrics.renderTimes.length === 0) return 0;
const total = this.metrics.renderTimes.reduce((sum, metric) => sum + metric.renderTime, 0);
return (total / this.metrics.renderTimes.length).toFixed(2);
}
calculateErrorRate() {
const totalOperations = this.metrics.renderTimes.length + this.metrics.errors.length;
if (totalOperations === 0) return 0;
return ((this.metrics.errors.length / totalOperations) * 100).toFixed(2);
}
calculateMemoryEfficiency() {
if (this.metrics.memoryUsage.length < 2) return 'N/A';
const recent = this.metrics.memoryUsage.slice(-10);
const first = recent[0];
const last = recent[recent.length - 1];
// Calculate growth over the recent time period
const totalGrowth = last.heapUsed - first.heapUsed;
const timeSpanMs = last.timestamp - first.timestamp;
const recentRenderCount = this.metrics.renderTimes.filter(
r => r.timestamp >= first.timestamp && r.timestamp <= last.timestamp
).length;
if (recentRenderCount === 0) return 'N/A';
const growthPerRender = totalGrowth / recentRenderCount;
// Convert to KB for readability
const growthKB = (growthPerRender / 1024).toFixed(2);
if (Math.abs(growthPerRender) < 1024) {
return 'Excellent (< 1KB/render in 10s)';
} else if (Math.abs(growthPerRender) < 10240) {
return `Good (${growthKB}KB/render in ${timeSpanMs}ms)`;
} else if (Math.abs(growthPerRender) < 102400) {
return `Fair (${growthKB}KB/render in ${timeSpanMs}ms)`;
} else {
return `Poor (${growthKB}KB/render in ${timeSpanMs}ms)`;
}
}
getRenderTimeStats() {
if (this.metrics.renderTimes.length === 0) return {};
const times = this.metrics.renderTimes.map(m => m.renderTime).sort((a, b) => a - b);
return {
min: times[0].toFixed(2),
max: times[times.length - 1].toFixed(2),
median: times[Math.floor(times.length / 2)].toFixed(2),
p95: times[Math.floor(times.length * 0.95)].toFixed(2),
p99: times[Math.floor(times.length * 0.99)].toFixed(2)
};
}
getTopComponentsByUsage(limit = 10) {
return Array.from(this.metrics.componentCounts.entries())
.sort(([, a], [, b]) => b - a)
.slice(0, limit)
.map(([component, count]) => ({ component, count }));
}
getSlowestComponents(limit = 10) {
const componentTimes = new Map();
for (const metric of this.metrics.renderTimes) {
const existing = componentTimes.get(metric.component) || [];
existing.push(metric.renderTime);
componentTimes.set(metric.component, existing);
}
return Array.from(componentTimes.entries())
.map(([component, times]) => ({
component,
avgTime: (times.reduce((a, b) => a + b, 0) / times.length).toFixed(2),
maxTime: Math.max(...times).toFixed(2),
count: times.length
}))
.sort((a, b) => parseFloat(b.avgTime) - parseFloat(a.avgTime))
.slice(0, limit);
}
getMemoryTrends() {
if (this.metrics.memoryUsage.length < 2) return {};
const recent = this.metrics.memoryUsage.slice(-20);
const trend = this.calculateTrend(recent.map(m => m.heapUsed));
return {
direction: trend > 0 ? 'increasing' : trend < 0 ? 'decreasing' : 'stable',
rate: `${Math.abs(trend).toFixed(2) } bytes/second`,
currentHeap: `${(recent[recent.length - 1].heapUsed / 1024 / 1024).toFixed(2) }MB`,
trend: trend
};
}
generatePerformanceRecommendations() {
const recommendations = [];
const avgRenderTime = parseFloat(this.calculateAverageRenderTime());
if (avgRenderTime > 10) {
recommendations.push({
priority: 'high',
issue: 'High average render time',
suggestion: 'Enable caching for frequently rendered components',
impact: 'Could reduce render time by 70-90%'
});
}
const errorRate = parseFloat(this.calculateErrorRate());
if (errorRate > 5) {
recommendations.push({
priority: 'high',
issue: 'High error rate',
suggestion: 'Review component validation and error handling',
impact: 'Improve stability and user experience'
});
}
const memTrends = this.getMemoryTrends();
if (memTrends.direction === 'increasing' && memTrends.trend > 1000000) {
recommendations.push({
priority: 'medium',
issue: 'Memory usage increasing',
suggestion: 'Check for memory leaks, implement cleanup for cached objects',
impact: 'Prevent out-of-memory errors in production'
});
}
const topComponents = this.getTopComponentsByUsage(5);
const hotComponents = topComponents.filter(c => c.count > this.metrics.renderTimes.length * 0.1);
// Filter out components that are already static cached
const uncachedHotComponents = hotComponents.filter(c => {
return !this.staticCachedComponents || !this.staticCachedComponents.has(c.component);
});
if (uncachedHotComponents.length > 0) {
recommendations.push({
priority: 'medium',
issue: 'High frequency components detected',
suggestion: `Consider static caching for: ${uncachedHotComponents.map(c => c.component).join(', ')}`,
impact: 'Significant performance improvement for hot paths'
});
} else if (hotComponents.length > 0) {
// All hot components are already static cached - provide positive feedback
recommendations.push({
priority: 'low',
issue: 'Hot components optimized',
suggestion: `Static caching active for: ${hotComponents.map(c => c.component).join(', ')}`,
impact: 'Excellent performance optimization already implemented'
});
}
return recommendations;
}
calculateTrend(values) {
if (values.length < 2) return 0;
const n = values.length;
const sumX = (n * (n - 1)) / 2;
const sumY = values.reduce((a, b) => a + b, 0);
const sumXY = values.reduce((sum, y, x) => sum + x * y, 0);
const sumXX = (n * (n - 1) * (2 * n - 1)) / 6;
return (n * sumXY - sumX * sumY) / (n * sumXX - sumX * sumX);
}
// Real-time monitoring interface
getRealtimeStats() {
const recent = this.metrics.renderTimes.slice(-10);
const recentMemory = this.metrics.memoryUsage.slice(-3);
return {
currentRenderRate: recent.length > 0 ? `${(recent.length / 10).toFixed(1) }/s` : '0/s',
avgRecentRenderTime: recent.length > 0
? `${(recent.reduce((sum, m) => sum + m.renderTime, 0) / recent.length).toFixed(2) }ms`
: '0ms',
memoryUsage: recentMemory.length > 0
? `${(recentMemory[recentMemory.length - 1].heapUsed / 1024 / 1024).toFixed(2) }MB`
: '0MB',
cacheHitRate: globalCache.getStats().hitRate,
activeComponents: this.metrics.componentCounts.size
};
}
/**
* Record component render performance
*/
recordRender(componentName, startTime, endTime, metadata = {}) {
if (!this.enabled) return;
const renderTime = endTime - startTime;
const renderData = {
component: componentName,
duration: renderTime,
timestamp: Date.now(),
...metadata
};
// Store render time
this.renderTimes.push(renderData);
// Update component stats
if (!this.componentStats.has(componentName)) {
this.componentStats.set(componentName, {
renders: 0,
totalTime: 0,
avgTime: 0,
minTime: Infinity,
maxTime: 0
});
}
const stats = this.componentStats.get(componentName);
stats.renders++;
stats.totalTime += renderTime;
stats.avgTime = stats.totalTime / stats.renders;
stats.minTime = Math.min(stats.minTime, renderTime);
stats.maxTime = Math.max(stats.maxTime, renderTime);
// Cleanup old data (keep last 1000 renders)
if (this.renderTimes.length > 1000) {
this.renderTimes = this.renderTimes.slice(-1000);
}
// Warning for slow renders
if (renderTime > this.thresholds.renderTime) {
console.warn(`Slow render detected: ${componentName} took ${renderTime.toFixed(2)}ms`);
}
}
}
// Global monitor instance
export const performanceMonitor = new PerformanceMonitor();
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