I have setup xdebug and webgrind and I have generated several profiling files. Where are those generated files stored?
You could set where xdebug save profiling activity in you active php.ini (ussually /etc/php5/apache2/php.ini) with
xdebug.remote_connect_back=1
xdebug.profiler_enable = 1
xdebug.profiler_output_name = xdebug.out.%t
xdebug.profiler_output_dir = /tmp
xdebug.profiler_enable_trigger = 1
Which set both filename and folder (xdebug.out.%t and /tmp) Dont forget to restart apache after saving php.ini
sudo service apache2 restart