bun.sh/bench/websocket-server/chat-client.mjs

const env = "process" in globalThis ? process.env : "Deno" in globalThis ? Deno.env.toObject() : {};

const SERVER = env.SERVER || "ws://0.0.0.0:4001";
const WebSocket = globalThis.WebSocket || (await import("ws")).WebSocket;
const LOG_MESSAGES = env.LOG_MESSAGES === "1";
const CLIENTS_TO_WAIT_FOR = parseInt(env.CLIENTS_COUNT || "", 10) || 16;
const DELAY = 64;
const MESSAGES_TO_SEND = Array.from({ length: 32 }, () => [
  "Hello World!",
  "Hello World! 1",
  "Hello World! 2",
  "Hello World! 3",
  "Hello World! 4",
  "Hello World! 5",
  "Hello World! 6",
  "Hello World! 7",
  "Hello World! 8",
  "Hello World! 9",
  "What is the meaning of life?",
  "where is the bathroom?",
  "zoo",
  "kangaroo",
  "erlang",
  "elixir",
  "bun",
  "mochi",
  "typescript",
  "javascript",
  "Hello World! 7",
  "Hello World! 8",
  "Hello World! 9",
  "What is the meaning of life?",
  "where is the bathroom?",
  "zoo",
  "kangaroo",
  "erlang",
  "elixir",
  "bun",
  "mochi",
  "typescript",
  "javascript",
  "Hello World! 7",
  "Hello World! 8",
  "Hello World! 9",
  "What is the meaning of life?",
  "Hello World! 7",
  "Hello World! 8",
  "Hello World! 9",
  "What is the meaning of life?",
  "where is the bathroom?",
  "zoo",
  "kangaroo",
  "erlang",
  "elixir",
  "bun",
  "mochi",
  "typescript",
  "javascript",
]).flat();

const NAMES = Array.from({ length: 50 }, (a, i) => [
  "Alice" + i,
  "Bob" + i,
  "Charlie" + i,
  "David" + i,
  "Eve" + i,
  "Frank" + i,
  "Grace" + i,
  "Heidi" + i,
  "Ivan" + i,
  "Judy" + i,
  "Karl" + i,
  "Linda" + i,
  "Mike" + i,
  "Nancy" + i,
  "Oscar" + i,
  "Peggy" + i,
  "Quentin" + i,
  "Ruth" + i,
  "Steve" + i,
  "Trudy" + i,
  "Ursula" + i,
  "Victor" + i,
  "Wendy" + i,
  "Xavier" + i,
  "Yvonne" + i,
  "Zach" + i,
])
  .flat()
  .slice(0, CLIENTS_TO_WAIT_FOR);

console.log(`Connecting ${CLIENTS_TO_WAIT_FOR} WebSocket clients...`);
console.time(`All ${CLIENTS_TO_WAIT_FOR} clients connected`);

var remainingClients = CLIENTS_TO_WAIT_FOR;
var promises = [];

const clients = new Array(CLIENTS_TO_WAIT_FOR);
for (let i = 0; i < CLIENTS_TO_WAIT_FOR; i++) {
  clients[i] = new WebSocket(`${SERVER}?name=${NAMES[i]}`);
  promises.push(
    new Promise((resolve, reject) => {
      clients[i].onmessage = event => {
        resolve();
      };
    }),
  );
}

await Promise.all(promises);
console.timeEnd(`All ${clients.length} clients connected`);

var received = 0;
var total = 0;
var more = false;
var remaining;

for (let i = 0; i < CLIENTS_TO_WAIT_FOR; i++) {
  clients[i].onmessage = event => {
    if (LOG_MESSAGES) console.log(event.data);
    received++;
    remaining--;

    if (remaining === 0) {
      more = true;
      remaining = total;
    }
  };
}

// each message is supposed to be received
// by each client
// so its an extra loop
for (let i = 0; i < CLIENTS_TO_WAIT_FOR; i++) {
  for (let j = 0; j < MESSAGES_TO_SEND.length; j++) {
    for (let k = 0; k < CLIENTS_TO_WAIT_FOR; k++) {
      total++;
    }
  }
}
remaining = total;

function restart() {
  for (let i = 0; i < CLIENTS_TO_WAIT_FOR; i++) {
    for (let j = 0; j < MESSAGES_TO_SEND.length; j++) {
      clients[i].send(MESSAGES_TO_SEND[j]);
    }
  }
}

var runs = [];
setInterval(() => {
  const last = received;
  runs.push(last);
  received = 0;
  console.log(
    last,
    `messages per second (${CLIENTS_TO_WAIT_FOR} clients x ${MESSAGES_TO_SEND.length} msg, min delay: ${DELAY}ms)`,
  );

  if (runs.length >= 10) {
    console.log("10 runs");
    console.log(JSON.stringify(runs, null, 2));
    if ("process" in globalThis) process.exit(0);
    runs.length = 0;
  }
}, 1000);
var isRestarting = false;
setInterval(() => {
  if (more && !isRestarting) {
    more = false;
    isRestarting = true;
    restart();
    isRestarting = false;
  }
}, DELAY);
restart();