Today I played around a while trying to configure Xdebug profiler to work with PhpStorm.  The following config only apply to a local LAMP stack with Xdebug installed with homebrew.

Here is the xdebug.ini I used :

The folder you choose for the output must be writable by the server. You can also be lazy and do : chmod 777 /PATH/TO/DIRECTORY

Once this is set, you can use this nifty little chrome plugin to start profiling.

The output will be written to the folder you specified. You can use it and let PhpStorm interpret the result for you by choosing : Tools | Analyze XDebug Profiler Snapshot.