Xdebug + KcacheGrind output graph shows percentages higher than 100%

2
votes

I'm using kcacheGrind to visualize debug output of a symfony application which was saved by xdebug. I'm referring the "Call Graph" to see the execution graph and its times.

I have set the following options in kCacheGrind as follows.

  • %Relative - on
  • Relative to parent - on
  • Cycle detection - off

Portion of my output is as follows. enter image description here

The problem with this is it shows the time percentages more than 100 in some classes. You can see that sfFilterChain->execute() has taken 216% of the execution time. Is this possible. What is the information which is given by that.

I have enable the cycle detection also and it didn't solve the confusion.

Can someone clarify this issue regarding the percentages of execution time. Thanks in advance.

1
xdebugkcachegrind

1 Answers

3
votes

It's a bug. Xdebug doesn't detect recursive calls properly at the moment. There is a bug for this too: http://bugs.xdebug.org/view.php?id=77 — which drastically needs attention. For Xdebug 2.3, I intend to redo most of the profiler functionality in Xdebug.