Description:
------------
Sometimes on i386 machines (not x86_64) xhprof displays wrong values in "Excl. Wall Time" column - extremely high (near 2 billions). Seems we have int32 overflow here while calculating.

The patch is attached. It simply converts all microseconds to double. It forces PHP to automatically cast to double all expression which use these values. It avoids overflows while displaying and calculating the statistics. I'll be pleased if you apply this patch in a next version.


Index: xhprof_lib/utils/xhprof_runs.php
===================================================================
--- xhprof_lib/utils/xhprof_runs.php	(revision 14556)
+++ xhprof_lib/utils/xhprof_runs.php	(working copy)
@@ -118,7 +118,15 @@
 
     $contents = file_get_contents($file_name);
     $run_desc = "XHProf Run (Namespace=$type)";
-    return unserialize($contents);
+    
+    $dump = unserialize($contents);
+    
+    // Convert all numbers to float to avoid int32 overflow.
+    foreach ($dump as $k => $v) {
+      $dump[$k]['ct'] = floatval($dump[$k]['ct']); 
+      $dump[$k]['wt'] = floatval($dump[$k]['wt']); 
+    }
+    return $dump;
   }
 
   public function save_run($xhprof_data, $type, $run_id = null) {