node/benchmark/buffers/buffer-write.js

'use strict';
var common = require('../common.js');
var bench = common.createBenchmark(main, {
  noAssert: [false, true],
  buffer: ['fast', 'slow'],
  type: ['UInt8', 'UInt16LE', 'UInt16BE',
         'UInt32LE', 'UInt32BE',
         'Int8', 'Int16LE', 'Int16BE',
         'Int32LE', 'Int32BE',
         'FloatLE', 'FloatBE',
         'DoubleLE', 'DoubleBE'],
  millions: [1]
});

const INT8   = 0x7f;
const INT16  = 0x7fff;
const INT32  = 0x7fffffff;
const UINT8  = (INT8 * 2) + 1;
const UINT16 = (INT16 * 2) + 1;
const UINT32 = INT32;

var mod = {
  writeInt8: INT8,
  writeInt16BE: INT16,
  writeInt16LE: INT16,
  writeInt32BE: INT32,
  writeInt32LE: INT32,
  writeUInt8: UINT8,
  writeUInt16BE: UINT16,
  writeUInt16LE: UINT16,
  writeUInt32BE: UINT32,
  writeUInt32LE: UINT32
};

function main(conf) {
  var noAssert = conf.noAssert === 'true';
  var len = +conf.millions * 1e6;
  var clazz = conf.buf === 'fast' ? Buffer : require('buffer').SlowBuffer;
  var buff = new clazz(8);
  var fn = 'write' + conf.type;

  if (fn.match(/Int/))
    benchInt(buff, fn, len, noAssert);
  else
    benchFloat(buff, fn, len, noAssert);
}

function benchInt(buff, fn, len, noAssert) {
  var m = mod[fn];
  var testFunction = new Function('buff', [
    "for (var i = 0; i !== " + len + "; i++) {",
    "  buff." + fn + "(i & " + m + ", 0, " + JSON.stringify(noAssert) + ");",
    "}"
  ].join("\n"));
  bench.start();
  testFunction(buff);
  bench.end(len / 1e6);
}

function benchFloat(buff, fn, len, noAssert) {
  var testFunction = new Function('buff', [
    "for (var i = 0; i !== " + len + "; i++) {",
    "  buff." + fn + "(i, 0, " + JSON.stringify(noAssert) + ");",
    "}"
  ].join("\n"));
  bench.start();
  testFunction(buff);
  bench.end(len / 1e6);
}