added wip benchmark tool

test/benchmark.js

@@ -0,0 +1,48 @@
+// small benchmark to execute with nodejs
+
+var http = require('http')
+
+var options = {
+  host: 'vizzuality.localhost.lan',
+  port: 80,
+  path: '/tiles/datos_agroguia_2/{z}/{x}/{y}.png?cache_buster=0&map_key=a9edf3d0d2edbcf55ad38ee5b23af1507b774a5b'
+};
+
+function randInt(min, max) {
+    return min + Math.floor(Math.random()*(max- min +1));
+}
+
+var start_time = new Date().getTime();
+function end() {
+    var end_time = new Date().getTime();
+    var t = (end_time - start_time)/1000;
+    console.log("ok: ", ok)
+    console.log("error: ", error)
+    console.log("time: ", t);
+    console.log("req/s: ", ok/t);
+}
+
+var N = 1000
+var ok = 0;
+var error = 0;
+for(var i = 0; i < N; ++i) {
+    var opt = {
+        host: options.host,
+        port: options.port,
+        path: new String(options.path)
+    };
+    opt.path = opt.path.replace('{z}', 2).replace('{x}', randInt(0, 3)).replace('{y}', randInt(0, 3));
+    console.log(opt.path)
+    http.get(opt, function(res) {
+        //console.log(ok + error);
+        ok++;
+        if(ok + error  === N) 
+            end();
+    }).on('error', function(e) {
+        //console.log(ok + error);
+        error ++;
+        if(ok + error  === N) 
+            end();
+    });
+}
+