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serial-benchmark.html
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serial-benchmark.html
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<html>
<head>
<title>Serial API Benchmark</title>
<!-- Token for http://localhost:8080 -->
<meta http-equiv="origin-trial" content="Akb1laKCBV9HnoMJrgTOLZpSWOG98KT9Y5L6rXbedzg7sH4x50fmF7gOqx2IMY8JDerZpWfKJGg6QsjQGNaiJQsAAABJeyJvcmlnaW4iOiJodHRwOi8vbG9jYWxob3N0OjgwODAiLCJmZWF0dXJlIjoiU2VyaWFsIiwiZXhwaXJ5IjoxNjA2MTc5MTM5fQ==">
<!-- Token for https://reillyeon.github.io -->
<meta http-equiv="origin-trial" content="ApjvYUhYrAx1MHZGTQ0ZW5i7QYj3Ig22ZIF4dwMFVwCTIwV5dfZOfyjKulVkWSW1+xC+QoVxhQZyW9uy5rnRcwwAAABTeyJvcmlnaW4iOiJodHRwczovL3JlaWxseWVvbi5naXRodWIuaW86NDQzIiwiZmVhdHVyZSI6IlNlcmlhbCIsImV4cGlyeSI6MTYwNjE3OTE0NH0=">
<style>
.time {
font-style: italic;
}
</style>
</head>
<body>
<p>
Baud rate: <input type="text" inputmode="numeric" pattern="[0-9]*" id="baud-rate" value="9600" required><br>
Buffer size: <input type="text" inputmode="numeric" pattern="[0-9]*" id="buffer-size" value="255" required><br>
Chunk size: <input type="text" inputmode="numeric" pattern="[0-9]*" id="chunk-size" value="1024" required><br>
Average rate over <input type="text" inputmode="numeric" pattern="[0-9]*" id="rate-interval" value="1000" required> milliseconds.
</p>
<p>
<button id="connect">Connect</button>
</p>
<p>
Reader:
<button id="reader" disabled>Start</button>
<button id="read-chunk" disabled>Read Chunk</button>
<button id="cancel-reader" disabled>Flush</button>
</p>
<p>
Writer:
<button id="writer" disabled>Start</button>
<button id="send-chunk" disabled>Send Chunk</button>
</p>
<p>
Bytes sent: <span id="sent-count">0</span><br>
Bytes received: <span id="received-count">0</span><br>
Bandwidth delay product: <span id="bandwidth-delay-product">0</span><br>
Outgoing rate: <span id="send-rate">0</span> bits/second<br>
Incoming rate: <span id="receive-rate">0</span> bits/second<br>
</p>
<p>Log:</p>
<p id="log"></p>
<script>
const baudRateEl = document.getElementById('baud-rate');
const bufferSizeEl = document.getElementById('buffer-size');
const chunkSizeEl = document.getElementById('chunk-size');
const rateIntervalEl = document.getElementById('rate-interval');
const connectButton = document.getElementById('connect');
const readerButton = document.getElementById('reader');
const readChunkButton = document.getElementById('read-chunk');
const cancelReaderButton = document.getElementById('cancel-reader');
const writerButton = document.getElementById('writer');
const sendChunkButton = document.getElementById('send-chunk');
const sentCountEl = document.getElementById('sent-count');
const receivedCountEl = document.getElementById('received-count');
const bandwidthDelayProductEl = document.getElementById('bandwidth-delay-product');
const outgoingRateEl = document.getElementById('send-rate');
const incomingRateEl = document.getElementById('receive-rate');
const logEl = document.getElementById('log');
let port = null;
let writing = false;
let reading = false;
let reader = null;
let readerFlushed = null;
let chunkSize = parseInt(chunkSizeEl.value);
let rateIntervalMs = parseInt(rateIntervalEl.value);
let rateIntervalId = -1;
let previousSentCount = 0;
let previousReceivedCount = 0;
let sentCount = 0;
let receivedCount = 0;
function incrementCounts(sentIncrement, receivedIncrement) {
sentCount += sentIncrement;
receivedCount += receivedIncrement;
const bandwidthDelayProduct = sentCount - receivedCount;
sentCountEl.textContent = sentCount;
receivedCountEl.textContent = receivedCount;
bandwidthDelayProductEl.textContent = bandwidthDelayProduct;
}
function calculateRates() {
const outgoingRate = (sentCount - previousSentCount) * 8 / (rateIntervalMs / 1000);
const incomingRate = (receivedCount - previousReceivedCount) * 8 / (rateIntervalMs / 1000);
previousSentCount = sentCount;
previousReceivedCount = receivedCount;
outgoingRateEl.textContent = outgoingRate;
incomingRateEl.textContent = incomingRate;
}
function log(message) {
logEl.innerHTML += `<span class="time">${new Date().toUTCString()}</span>: ${message}<br>`;
}
async function writerLoop() {
writerButton.textContent = 'Stop';
sendChunkButton.disabled = true;
writing = true;
while (writing && port && port.writable) {
const writer = port.writable.getWriter();
try {
while (writing) {
const buffer = new Uint8Array(chunkSize);
await writer.write(buffer);
incrementCounts(buffer.byteLength, 0);
}
} catch (e) {
console.error(e);
} finally {
writer.releaseLock();
}
}
writerButton.textContent = 'Start';
if (port) {
writerButton.disabled = false;
sendChunkButton.disabled = false;
}
}
async function readerLoop() {
readerButton.textContent = 'Stop';
readChunkButton.disabled = true;
reading = true;
while (reading && port && port.readable) {
if (reader === null) {
reader = port.readable.getReader();
log('Reader created.');
cancelReaderButton.disabled = false;
}
try {
while (reading) {
const { value, done } = await reader.read();
if (value) {
incrementCounts(0, value.byteLength);
}
if (done) {
log('Reader done.');
if (readerFlushed) {
// Avoid a tight loop while reader.cancel() completes.
await readerFlushed;
}
break;
}
}
} catch (e) {
log(`Read error: ${e.name}, ${e.message}`);
reader.releaseLock();
reader = null;
cancelReaderButton.disabled = true;
}
}
readerButton.textContent = 'Start';
if (port) {
readerButton.disabled = false;
readChunkButton.disabled = false;
}
}
async function connect() {
connectButton.disabled = true;
const baudRate = parseInt(baudRateEl.value);
const bufferSize = parseInt(bufferSizeEl.value);
const options = {
baudRate,
bufferSize,
// Prior to Chrome 86 these names were used.
baudrate: baudRate,
buffersize: bufferSize,
};
port = await navigator.serial.requestPort();
await port.open(options);
log('Port opened.');
connectButton.textContent = 'Disconnect';
connectButton.disabled = false;
readerButton.disabled = false;
readChunkButton.disabled = false;
writerButton.disabled = false;
sendChunkButton.disabled = false;
rateIntervalId = setInterval(calculateRates, rateIntervalMs);
}
async function disconnect() {
connectButton.disabled = true;
cancelReaderButton.disabled = true;
if (reader) {
reader.releaseLock();
reader = null;
}
log('Closing port...');
await port.close();
log('Port closed.');
port = null;
connectButton.textContent = 'Connect';
connectButton.disabled = false;
readerButton.disabled = true;
readChunkButton.disabled = true;
writerButton.disabled = true;
sendChunkButton.disabled = true;
clearInterval(rateIntervalId);
rateIntervalId = -1;
}
connectButton.addEventListener('click', () => {
if (port) {
disconnect();
} else {
connect();
}
});
readerButton.addEventListener('click', () => {
if (reading) {
reading = false;
reader.cancel();
reader = null;
readerButton.disabled = true;
readChunkButton.disabled = true;
} else {
readerLoop();
}
});
readChunkButton.addEventListener('click', async () => {
readerButton.disabled = true;
readChunkButton.disabled = true;
if (reader === null) {
reader = port.readable.getReader();
log('Reader created.');
cancelReaderButton.disabled = false;
}
try {
const { value, done } = await reader.read();
if (value) {
incrementCounts(0, value.byteLength);
}
} catch (e) {
log(`Read error: ${e.name}, ${e.message}`);
reader.releaseLock();
reader = null;
cancelReaderButton.disabled = true;
}
if (port) {
readerButton.disabled = false;
readChunkButton.disabled = false;
}
});
cancelReaderButton.addEventListener('click', async () => {
cancelReaderButton.disabled = true;
log('Flushing reader...');
readerFlushed = reader.cancel();
await readerFlushed;
readerFlushed = null;
log('Reader flushed.');
reader = null;
cancelReaderButton.disabled = false;
});
writerButton.addEventListener('click', () => {
if (writing) {
writing = false;
writerButton.disabled = true;
sendChunkButton.disabled = true;
} else {
writerLoop();
}
});
sendChunkButton.addEventListener('click', async () => {
writerButton.disabled = true;
sendChunkButton.disabled = true;
const writer = port.writable.getWriter();
try {
const buffer = new Uint8Array(chunkSize);
await writer.write(buffer);
incrementCounts(buffer.byteLength, 0);
} catch (e) {
console.error(e);
} finally {
writer.releaseLock();
}
if (port) {
writerButton.disabled = false;
sendChunkButton.disabled = false;
}
});
rateIntervalEl.addEventListener('change', () => {
rateIntervalMs = parseInt(rateIntervalEl.value);
if (rateIntervalId != -1) {
clearInterval(rateIntervalEl);
rateIntervalId = setInterval(calculateRates, rateIntervalMs);
}
});
chunkSizeEl.addEventListener('change', () => {
chunkSize = parseInt(chunkSizeEl.value);
})
</script>
</body>
</html>