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// Test UDP send throughput with the multi buffer API against Buffer.concat
'use strict';
const common = require('../common.js');
const dgram = require('dgram');
const PORT = common.PORT;
// `num` is the number of send requests to queue up each time.
// Keep it reasonably high (>10) otherwise you're benchmarking the speed of
// event loop cycles more than anything else.
const bench = common.createBenchmark(main, {
len: [64, 256, 512, 1024],
num: [100],
chunks: [1, 2, 4, 8],
type: ['concat', 'multi'],
dur: [5]
});
function main({ dur, len, num, type, chunks }) {
const chunk = [];
for (let i = 0; i < chunks; i++) {
chunk.push(Buffer.allocUnsafe(Math.round(len / chunks)));
}
// Server
let sent = 0;
const socket = dgram.createSocket('udp4');
const onsend = type === 'concat' ? onsendConcat : onsendMulti;
function onsendConcat() {
if (sent++ % num === 0) {
// The setImmediate() is necessary to have event loop progress on OSes
// that only perform synchronous I/O on nonblocking UDP sockets.
setImmediate(() => {
for (let i = 0; i < num; i++) {
socket.send(Buffer.concat(chunk), PORT, '127.0.0.1', onsend);
}
});
}
}
function onsendMulti() {
if (sent++ % num === 0) {
// The setImmediate() is necessary to have event loop progress on OSes
// that only perform synchronous I/O on nonblocking UDP sockets.
setImmediate(() => {
for (let i = 0; i < num; i++) {
socket.send(chunk, PORT, '127.0.0.1', onsend);
}
});
}
}
socket.on('listening', () => {
bench.start();
onsend();
setTimeout(() => {
const bytes = sent * len;
const gbits = (bytes * 8) / (1024 * 1024 * 1024);
bench.end(gbits);
process.exit(0);
}, dur * 1000);
});
socket.bind(PORT);
}
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