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+Test Runtimes
+=============
+
+These files contain runtimes for test manifests in the tree. They are of the form:
+
+ { '<path to manifest>': <average runtime in seconds> }
+
+They are being used to normalize chunk durations so all chunks take roughly
+the same length of time.
+
+Generating a Test Runtime File
+------------------------------
+
+The ``writeruntimes`` script can be used to generate this file:
+
+ $ ./writeruntimes
+
+It will take awhile. You can optionally specify platforms or suites on the
+command line, but these should only be used for debugging purposes (not for
+committing an update to the data). For more info, see:
+
+ $ ./writeruntimes -- --help