Measure what this library sustains, and against Jasmin and SMPPSim

benchmarks/run.ts

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+import { spawn } from 'node:child_process';
+import { once } from 'node:events';
+import { createInterface } from 'node:readline';
+
+/**
+ * Node rather than Python, unlike the repo's other standalone scripts: it spawns the two processes
+ * it measures, and they must run on the same runtime this library is measured under.
+ */
+const concurrencies = [1, 10, 50, 200];
+const count = Number(process.env.COUNT ?? 5000);
+
+function node(script: string, args: string[] = []) {
+	return spawn(process.execPath, [`${import.meta.dirname}/${script}`, ...args], {
+		stdio: ['ignore', 'pipe', 'inherit'],
+	});
+}
+
+async function firstLine(stream: NodeJS.ReadableStream): Promise<string> {
+	for await (const line of createInterface({ input: stream })) {
+		return line;
+	}
+
+	return '';
+}
+
+const sink = node('smsc-sink.ts');
+const listening: unknown = JSON.parse(await firstLine(sink.stdout));
+
+if (typeof listening !== 'object' || listening === null || !('port' in listening)) {
+	throw new Error('the sink did not report a port');
+}
+
+const port = String(listening.port);
+const rows: Record<string, unknown>[] = [];
+
+for (const dlr of [false, true]) {
+	for (const concurrency of concurrencies) {
+		const load = node('submit-load.ts', [
+			`--port=${port}`,
+			`--count=${String(count)}`,
+			`--concurrency=${String(concurrency)}`,
+			...(dlr ? ['--dlr'] : []),
+		]);
+		const reported: unknown = JSON.parse(await firstLine(load.stdout));
+
+		await once(load, 'exit');
+
+		if (typeof reported === 'object' && reported !== null) rows.push({ ...reported });
+	}
+}
+
+sink.kill('SIGTERM');
+await once(sink, 'exit');
+
+process.stdout.write(`\n${'dlr'.padEnd(6)}${'window'.padEnd(9)}${'msgs/s'.padEnd(10)}seconds\n`);
+
+for (const row of rows) {
+	const dlr = String(row.dlr).padEnd(6);
+	const window = String(row.concurrency).padEnd(9);
+	const rate = String(row.perSecond).padEnd(10);
+
+	process.stdout.write(`${dlr}${window}${rate}${String(row.seconds)}\n`);
+}