testing buffer write performance

bufftest.js

Buffer.prototype.xwriteUInt8 = function(value, offset) {
	this[offset] = value & 0xff;
}

Buffer.prototype.xwriteUInt16BE = function(value, offset) {
	this[offset++] = (value >>> 8) & 0xff;
	this[offset] = value & 0xff;
}

Buffer.prototype.xwriteUInt32BE = function(value, offset) {
	this[offset++] = (value >>> 24) & 0xff;
	this[offset++] = (value >>> 16) & 0xff;
	this[offset++] = (value >>> 8) & 0xff;
	this[offset] = value & 0xff;
}

function test1(counter) {
	var b = new Buffer([0,0,0,0,0,0,0,0,0,0,0]);
	var vw = new DataView(b);
	var i = counter;
	var then = new Date().getTime();
	while(i) {
		vw.setUint8(0, i-- % 2);
		vw.setUint16(1, i-- % 2);
		vw.setUint32(3, i--);
		vw.setUint32(7, i--);
	}
	var now = new Date().getTime();
	var elapsed = (now - then)/1000;
	console.log("DataView\t" + elapsed.toFixed(2) + "\t" + (counter/elapsed).toFixed(2));
	//console.log(b);
}

function test2(counter) {
	var b = new Buffer([0,0,0,0,0,0,0,0,0,0,0]);
	var then = new Date().getTime();
	var i = counter;
	while(i) {
		b.writeUInt8(i-- % 2, 0);
		b.writeUInt16BE(i-- % 2, 1);
		b.writeUInt32BE(i--, 3);
		b.writeUInt32BE(i--, 7);
	}
	var now = new Date().getTime();
	var elapsed = (now - then)/1000;
	console.log("Buffer Verify\t" + elapsed.toFixed(2) + "\t" + (counter/elapsed).toFixed(2));
	//console.log(b);
}

function test3(counter) {
	var b = new Buffer([0,0,0,0,0,0,0,0,0,0,0]);
	var then = new Date().getTime();
	var i = counter;
	while(i) {
		b.writeUInt8(i-- % 2, 0, true);
		b.writeUInt16BE(i-- % 2, 1, true);
		b.writeUInt32BE(i--, 3, true);
		b.writeUInt32BE(i--, 7, true);
	}
	var now = new Date().getTime();
	var elapsed = (now - then)/1000;
	console.log("Buffer No Verify\t" + elapsed.toFixed(2) + "\t" + (counter/elapsed).toFixed(2));
	//console.log(b);
}

function test4(counter) {
	var b = new Buffer([0,0,0,0,0,0,0,0,0,0,0]);
	var then = new Date().getTime();
	var i = counter;
	while(i) {
		b.xwriteUInt8(i-- % 2, 0);
		b.xwriteUInt16BE(i-- % 2, 1);
		b.xwriteUInt32BE(i--, 3);
		b.xwriteUInt32BE(i--, 7);
	}
	var now = new Date().getTime();
	var elapsed = (now - then)/1000;
	console.log("Buffer Direct\t" + elapsed.toFixed(2) + "\t" + (counter/elapsed).toFixed(2));
	//console.log(b);
}

function test5(counter) {
	var b = new Buffer([0,0,0,0,0,0,0,0,0,0,0]);
	var i = counter;
	var then = new Date().getTime();
	var num = 0;
	while(i) {
		b[0] = (i-- % 2) & 0xff;
		
		num = i-- %2;
		b[1] = (num >>> 8) & 0xff;
		b[2] = num & 0xff;

		num = i--;
		b[3] = (num >>> 24) & 0xff;
		b[4] = (num >>> 16) & 0xff;
		b[5] = (num >>> 8) & 0xff;
		b[6] = num & 0xff;

		num = i--;
		b[7] = (num >>> 24) & 0xff;
		b[8] = (num >>> 16) & 0xff;
		b[9] = (num >>> 8) & 0xff;
		b[10] = num & 0xff;
	}
	var now = new Date().getTime();
	var elapsed = (now - then)/1000;
	console.log("Direct\t" + elapsed.toFixed(2) + "\t" + (counter/elapsed).toFixed(2));
	//console.log(b);
}

while(true) {
	test1(10000000);
	test2(10000000);
	test3(50000000);
	test4(500000000);
	test5(500000000);
	console.log("---");
}