3.7.0 • Published 2 years ago
inspector-vm v3.7.0
inspector-vm
NodeJS VM Metric Collector
Take a look at the Documentation.
install
This library is meant to be used with typescript
/ nodejs
.
npm install --save inspector-vm
basic usage
import { MetricRegistry } from "inspector-metrics";
import {
V8EventLoop,
V8MemoryMetrics,
V8GCMetrics,
V8ProcessMetrics,
} from "inspector-vm";
// get a registry
const registry: MetricRegistry = ...;
// instance the memory metric, contains
// - space statistics
// - memory statistics
const memoryMetrics: V8MemoryMetrics = new V8MemoryMetrics("v8");
// - gc statistics
const gc: V8GCMetrics = new V8GCMetrics("gc", registry.getDefaultClock());
// - event loop delay / latency
const eventLoop: V8EventLoop = new V8EventLoop("eventLoop");
// - cpu_usage (system, user, total)
// - active_handles
// - active_requests
const processMetric: V8ProcessMetrics = new V8ProcessMetrics("process");
// metric is registered und the name "v8"
registry.registerMetric(memoryMetrics);
// metric is registered und the name "gc"
registry.registerMetric(gc);
// metric is registered und the name "eventLoop"
registry.registerMetric(eventLoop);
// metric is registered und the name "process"
registry.registerMetric(processMetric);
// setup reporter ...
// note that unstopped metrics can cause the application to keep running
memoryMetrics.stop();
gc.stop();
eventLoop.stop();
processMetric.stop();
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