node-mapnik bencharmking for protozero

bench.js

var mapnik = require('mapnik');
var fs = require('fs');

var iterations = 20000,
    i = total = 0,
    max = -Infinity,
    min = Infinity,
    tile = './785.vector.pbf';

decode();
function decode() {

  var vt = new mapnik.VectorTile(14, 2749, 6335);
  var buffer = fs.readFileSync(tile);
  var start = new Date().getTime() / 1000;

  vt.addData(buffer, function(err) {
    if (err) throw err;
    var finish = new Date().getTime() / 1000;
    
    var duration = finish - start;
    total += duration;
    if (duration > max) max = duration;
    if (duration < min) min = duration;

    if (i <= iterations) {
      i++;
      decode();
    } else {
      console.log('Iterations  : ' + iterations);
      console.log('Total (s)   : ' + total);
      console.log('Average (s) : ' + total / iterations);
      console.log('Max (s)     : ' + max);
      console.log('Min (s)     : ' + min);
    }
  });
}