+There is also experimental support for automatically trimming the calls
+necessary for a given frame or call:
+
+ apitrace trim --auto --calls=12345 -o trimed.trace application.trace
+ apitrace trim --auto --frames=12345 -o trimed.trace application.trace
+
+
+Profiling a trace
+-----------------
+
+You can perform gpu and cpu profiling with the command line options:
+
+ * `--pgpu` record gpu times for frames and draw calls.
+
+ * `--pcpu` record cpu times for frames and draw calls.
+
+ * `--ppd` record pixels drawn for each draw call.
+
+The results from these can then be read by hand or analyzed with a script.
+
+`scripts/profileshader.py` will read the profile results and format them into a
+table which displays profiling results per shader.
+
+For example, to record all profiling data and utilise the per shader script:
+
+ apitrace replay --pgpu --pcpu --ppd foo.trace | ./scripts/profileshader.py
+