added large dataset benchmark

benchmark/large-datatset-bench.js

@@ -0,0 +1,83 @@
+var pg = require(__dirname + '/../lib')
+var bencher = require('bencher');
+var helper = require(__dirname + '/../test/test-helper')
+var conString = helper.connectionString()
+
+var round = function(num) {
+  return Math.round((num*1000))/1000
+}
+
+var doBenchmark = function() {
+  var bench = bencher({
+    name: 'select large sets',
+    repeat: 10,
+    actions: [{
+      name: 'selecting string',
+      run: function(next) {
+        var query = client.query('SELECT name FROM items');
+        query.on('end', function() {
+          next();
+        });
+      }
+    }, {
+      name: 'selecting integer',
+      run: function(next) {
+        var query = client.query('SELECT count FROM items');
+        query.on('end', function() {
+          next();
+        })
+      }
+    }, {
+      name: 'selecting date',
+      run: function(next) {
+        var query = client.query('SELECT created FROM items');
+        query.on('end', function() {
+          next();
+        })
+      }
+    }, {
+      name: 'selecting row',
+      run: function(next) {
+        var query = client.query('SELECT * FROM items');
+        query.on('end', function() {
+          next();
+        })
+      }
+    }, {
+      name: 'loading all rows into memory', 
+      run: function(next) {
+        var query = client.query('SELECT * FROM items', next);
+      }
+    }]
+  });
+  bench(function(result) {
+    console.log();
+    console.log("%s (%d repeats):", result.name, result.repeat)
+    result.actions.forEach(function(action) {
+      console.log("  %s: \n    average: %d ms\n    total: %d ms", action.name, round(action.meanTime), round(action.totalTime));
+    })
+    client.end();
+  })
+}
+
+
+var client = new pg.Client(conString);
+client.connect();
+console.log();
+console.log("creating temp table");
+client.query("CREATE TEMP TABLE items(name VARCHAR(10), created TIMESTAMPTZ, count INTEGER)");
+var count = 10000;
+console.log("inserting %d rows", count);
+for(var i = 0; i < count; i++) {
+  var query = {
+    name: 'insert',
+    text: "INSERT INTO items(name, created, count) VALUES($1, $2, $3)",
+    values: ["item"+i, new Date(2010, 01, 01, i, 0, 0), i]
+  };
+  client.query(query);
+}
+
+client.once('drain', function() {
+  console.log('done with insert. executing benchmark.');
+  doBenchmark();
+});