l-test.js

'use strict';

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

var db = levelup('./ldb');
var bytes = fs.readFileSync('./image.jpeg', 'binary');

var c = 0;

setInterval(function() {
  console.log(db.db.getProperty('leveldb.stats'))
}, 1000);

setInterval(function() {
  db.put('k', bytes, function() {
    db.del('k', function() {
      console.log(++c + ' cycle ' + bytes.length);
    });
  });
}, 50);