Profile/Trace files - where are they created?

When profiling/tracing code where are the files created?  I've looked in /tmp and all over the htdocs folders but I can't find them.
The profiling does work with PHPStorm (after starting profiling and reloding the page the profile loads so the file is being created (I think)) but I would like to also use KCacheGrind so I would like to know where the files are located.

Thanks
Scott

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