gcstats.js

const gcStats = require('gcstats.js'); gcStats.on('stats', function(stats) { const gctypeMap = { 1: 'Scavenge (Minor GC)', 2: 'Mark/Sweep/Compact (Major GC)', 3: 'All GC Types' }; console.log('--- GC Happened ---'); console.log(`Type: ${gctypeMap[stats.gctype] || 'Unknown'}`); console.log(`Pause: ${(stats.pause / 1_000_000).toFixed(2)} ms`); console.log(`Heap Used Before: ${(stats.before.usedHeapSize / (1024 * 1024)).toFixed(2)} MB`); console.log(`Heap Used After: ${(stats.after.usedHeapSize / (1024 * 1024)).toFixed(2)} MB`); console.log(`Total Heap Size: ${(stats.after.totalHeapSize / (1024 * 1024)).toFixed(2)} MB`); console.log('-------------------\n'); }); // Simulate some memory usage to trigger GC events periodically let data = []; setInterval(() => { // Allocate new data const allocationSizeMB = Math.random() * 5 + 5; // 5-10 MB data.push(Buffer.alloc(Math.floor(allocationSizeMB * 1024 * 1024))); // Periodically dereference old data to allow GC to reclaim memory if (data.length > 10) { data.splice(0, Math.floor(data.length / 2)); // Remove half of the old data } // Keep some data around to simulate a working application console.log(`Current data array size: ${data.length}, total simulated memory: ${(data.reduce((sum, buf) => sum + buf.length, 0) / (1024 * 1024)).toFixed(2)} MB`); }, 500); // Trigger allocations every 500ms console.log('gcstats.js initialized. Simulating memory usage...');