Added GC events

Author: dkhan

app.js

@@ -1,7 +1,12 @@
+
+
+// CPU Profiling
 // require('./monitoring/CpuProfiler').init('./public/metrics');
+
+// Heap Dumps and Metrics
 // require('./monitoring/HeapDump').init('./public/metrics');
-var createNamespace = require('continuation-local' + '-storage').createNamespace;
-var asyncCallbackMiddleware = require('./monitoring/AsyncCallbackMiddleware');
+
+// See below for callback timings
 
 
 
@@ -19,7 +24,9 @@ var todo = require('./routes/todo');
 
 var app = express();
 
-// Switch on callback listener
+// Callback timings
+var asyncCallbackMiddleware = require('./monitoring/AsyncCallbackMiddleware');
+var createNamespace = require('continuation-local' + '-storage').createNamespace;
 app.use(asyncCallbackMiddleware);
 
 // view engine setup

monitoring/HeapDump.js

@@ -10,6 +10,14 @@ var fs = require('fs');
 var profiler = require('v8-profiler');
 var _datadir = null;
 var nextMBThreshold = 0;
+var gcprofiler = require('gc-profiler');
+
+// Listen to GC events
+gcprofiler.on('gc', function (info) {
+    console.log('GC happened');
+    console.log(info);
+});
+
 
 /**
  * Init and scheule heap dump runs

package.json

@@ -11,6 +11,7 @@
     "cookie-parser": "~1.3.5",
     "debug": "~2.2.0",
     "express": "~4.12.4",
+    "gc-profiler": "^1.2.0",
     "jade": "~1.9.2",
     "less-middleware": "1.0.x",
     "morgan": "~1.5.3",