Benchmarking checksum when applying delta using fossil-delta-js: https://github.com/dchest/fossil-delta-js/pull/1

fossil-delta-js-checksum.js

var Benchmark = require('benchmark');
var fs = require('fs');
var path = require('path');
var fossilDelta = require('../fossil-delta.js');

// Silence error logging.
fossilDelta.logError = function() {}

var makeArray = function(buf) {
  var a = new Array(buf.length);
  for (var i = 0; i < buf.length; i++) a[i] = buf[i];
  return a;
}

var origins = {};
var goodDeltas = {};

var NTESTS = 5;
for (var i = 1; i <= NTESTS; i++) {
  var dir = path.join(__dirname, '..', 'test', 'data', i.toString());
  origins[i] = makeArray(fs.readFileSync(path.join(dir, 'origin')));
  goodDeltas[i] = makeArray(fs.readFileSync(path.join(dir, 'delta')));
}

var suite = new Benchmark.Suite();

suite.add("with checksum", function() {
  fossilDelta.ENABLE_CHECKSUM = true;
  for (var i = 1; i <= NTESTS; i++) {
    fossilDelta.apply(origins[i], goodDeltas[i]);
  }
});

suite.add("without checksum", function() {
  fossilDelta.ENABLE_CHECKSUM = false;
  for (var i = 1; i <= NTESTS; i++) {
    fossilDelta.apply(origins[i], goodDeltas[i]);
  }
});

suite.on('cycle', function(e) {
  console.log( e.target.toString() );
});

suite.run();

results.txt

with checksum x 10,960 ops/sec ±1.50% (87 runs sampled)
without checksum x 12,438 ops/sec ±1.46% (85 runs sampled)