Tests async.parallelLimit to see how it behaves

parallelLimitTest.js

var async = require('async');

var tasks = [];
for (var i = 0; i < 25; i++) { 
  (function(i) { 
    if (i % 2 === 0) { 
      tasks.push(function(cb) { 
        console.log('Start ' + i.toString() + ' - fast');
        setTimeout(function() { 
          console.log('Finish ' + i.toString() + ' - fast');
          cb();
        }, 100);
      });
    } else { 
      tasks.push(function(cb) { 
        console.log('Start ' + i.toString() + ' - slow');
        setTimeout(function() { 
          console.log('Finish ' + i.toString() + ' - slow');
          cb();
        }, 500);
      });
    } 
  })(i);
}
async.parallelLimit(tasks, 5, function(err) { 
  console.log('done with tasks', err);
});