Add benchmarks for counter (same as gauge) (#596)

benchmarks/counter.js

@@ -0,0 +1,42 @@
+'use strict';
+
+const { getLabelNames, labelCombinationFactory } = require('./utils/labels');
+
+module.exports = setupCounterSuite;
+
+function setupCounterSuite(suite) {
+	suite.add(
+		'inc',
+		labelCombinationFactory([], (client, { Counter }, labels) =>
+			Counter.inc(labels, 1),
+		),
+		{ teardown, setup: setup(0) },
+	);
+
+	suite.add(
+		'inc with labels',
+		labelCombinationFactory([8, 8], (client, { Counter }, labels) =>
+			Counter.inc(labels, 1),
+		),
+		{ teardown, setup: setup(2) },
+	);
+}
+
+function setup(labelCount) {
+	return client => {
+		const registry = new client.Registry();
+
+		const Counter = new client.Counter({
+			name: 'Counter',
+			help: 'Counter',
+			labelNames: getLabelNames(labelCount),
+			registers: [registry],
+		});
+
+		return { registry, Counter };
+	};
+}
+
+function teardown(client, { registry }) {
+	registry.clear();
+}

benchmarks/index.js

@@ -9,6 +9,7 @@ const benchmarks = createRegressionBenchmark(currentClient, [
 
 benchmarks.suite('registry', require('./registry'));
 benchmarks.suite('histogram', require('./histogram'));
+benchmarks.suite('counter', require('./counter'));
 benchmarks.suite('gauge', require('./gauge'));
 benchmarks.suite('summary', require('./summary'));
 benchmarks.run().catch(err => {