Stress a bit sharp to show memory leak

memleak.js

var sharp = require('sharp');
var async = require("async");

sharp.cache(0);

var dlImage = function(done) {
  var http = require('http');
  var fs = require('fs');
  if(!fs.existsSync("fixture.jpg")) {
    var file = fs.createWriteStream("fixture.jpg");
    var request = http.get("http://anthropocenejournal.files.wordpress.com/2012/12/nasa-high-res-earth-at-night-dnb_land_ocean_ice-2012-13500x6750.jpg", function(response) {
      response.pipe(file);
      file.on('finish', function() {
        file.close(done);
      });
    });
  } else {
    done();
  }
};

var sizes = [];
for (var i = 200; i < 1000; i++) {
  sizes.push(i);
};

var resize = function(done) {
  async.eachLimit(sizes, 5,
    function(item, next) {
      sharp("fixture.jpg").resize(item).sharpen().webp(function(err, buffer) {
        next(err);
      });
    },
    function(err){
      done(err);
    }
  );
};

async.series([
    dlImage,
    resize
], function(err) {
  console.log("done");
  if(err)
    console.log(err);
});

setInterval(function() {
  console.log(process.memoryUsage());
}, 1000);