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// test the speed of .pipe() with sockets
var net = require('net');
var N = parseInt(process.argv[2]) || 100;
var start;
function Writer() {
this.start = null;
this.received = 0;
this.writable = true;
this.printStats = this.printStats.bind(this);
this.interval = setInterval(this.printStats, 1000);
}
Writer.prototype.write = function(chunk, encoding, cb) {
if (!this.start)
this.start = process.hrtime();
this.received += chunk.length;
if (typeof encoding === 'function')
encoding();
else if (typeof cb === 'function')
cb();
return true;
};
// doesn't matter, never emits anything.
Writer.prototype.on = function() {};
Writer.prototype.once = function() {};
Writer.prototype.emit = function() {};
var rates = [];
var statCounter = 0;
Writer.prototype.printStats = function() {
if (!this.start || !this.received)
return;
var elapsed = process.hrtime(this.start);
elapsed = elapsed[0] * 1E9 + elapsed[1];
var bits = this.received * 8;
var gbits = bits / (1024 * 1024 * 1024);
var rate = gbits / elapsed * 1E9;
rates.push(rate);
console.log('%s Gbits/sec (%d bits / %d ns)', rate.toFixed(4), bits, elapsed);
// reset to keep getting instant time.
this.start = process.hrtime();
this.received = 0;
if (++statCounter === N) {
report();
process.exit(0);
}
};
function report() {
rates.sort();
var min = rates[0];
var max = rates[rates.length - 1];
var median = rates[rates.length >> 1];
var avg = 0;
rates.forEach(function(rate) { avg += rate });
avg /= rates.length;
console.error('min:%s avg:%s max:%s median:%s',
min.toFixed(2),
avg.toFixed(2),
max.toFixed(2),
median.toFixed(2));
}
var len = process.env.LENGTH || 16 * 1024 * 1024;
var chunk = new Buffer(len);
for (var i = 0; i < len; i++) {
chunk[i] = i % 256;
}
function Reader() {
this.flow = this.flow.bind(this);
this.readable = true;
}
Reader.prototype.pipe = function(dest) {
this.dest = dest;
this.flow();
return dest;
};
Reader.prototype.flow = function() {
var dest = this.dest;
var res = dest.write(chunk);
if (!res)
dest.once('drain', this.flow);
else
process.nextTick(this.flow);
};
var reader = new Reader();
var writer = new Writer();
// the actual benchmark.
var server = net.createServer(function(socket) {
socket.pipe(socket);
});
server.listen(1337, function() {
var socket = net.connect(1337);
socket.on('connect', function() {
reader.pipe(socket);
socket.pipe(writer);
});
});