As of http://trac.webkit.org/changeset/144719
--profile and --profiler= work in run-webkit-tests, just like they do in run-perf-tests. For example you can find out why your/favorite/tests are so slow with: run-webkit-tests your/favorite/tests --profile RWT will sample each DRT instance and print out instructions on how to view it (or show you the top 10 samples if you're on an OS with command-line). On my Mac, it says something like: iprofiler: Profiling process 21958 (DumpRenderTree) for 10 seconds iprofiler: Session saved at /Users/eseidel/Projects/WebKit/Source/WebKit/chromium/webkit/Release/layout-test-results/test-72.dtps I've found these incredibly useful for making WebKit faster, and I hope you do too.
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