# perf-counters Lightweight bindings to Linux perf event counters. ``` $ node > var PerfCounters = require('perf-counters'); > PerfCounters.init(); > var start = PerfCounters.getCounters(); console.log('test'); var end = PerfCounters.getCounters(); test > start { instructions: 1382, loads: 421, stores: 309 } > end { instructions: 647633, loads: 195771, stores: 133246 } > ```