emit preload timing

1 files changed, 8 insertions, 0 deletions

diff --git a/src/postamble.js b/src/postamble.js
index 08c3a9d8..d6a452f8 100644
--- a/src/postamble.js
+++ b/src/postamble.js
@@ -11,12 +11,18 @@ ExitStatus.prototype.constructor = ExitStatus;
 
 var initialStackTop;
 
+var preloadStartTime = null;
+
 Module['callMain'] = Module.callMain = function callMain(args) {
   assert(runDependencies == 0, 'cannot call main when async dependencies remain! (listen on __ATMAIN__)');
   assert(__ATPRERUN__.length == 0, 'cannot call main when preRun functions remain to be called');
 
   args = args || [];
 
+  if (preloadStartTime !== null) {
+    Module.printErr('preload time: ' + (Date.now() - preloadStartTime) + ' ms');
+  }
+
   ensureInitRuntime();
 
   var argc = args.length+1;
@@ -72,6 +78,8 @@ Module['callMain'] = Module.callMain = function callMain(args) {
 function run(args) {
   args = args || Module['arguments'];
 
+  if (preloadStartTime === null) preloadStartTime = Date.now();
+
   if (runDependencies > 0) {
     Module.printErr('run() called, but dependencies remain, so not running');
     return;