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Trace-Viewer is the javascript frontend for Chrome about:tracing and Android systrace.

It provides rich analysis and visualization capabilities for many types of trace files. Its particularly good at viewing linux kernel traces (aka ftrace) and Chrome's trace_event format. Trace viewer can be embedded as a component in your own code, or used from a plain checkout to turn trace files into standalone, emailable HTML files from the commandline:

$CATAPULT/tracing/bin/trace2html my_trace.json --output=my_trace.html && open my_trace.html

Its easy to extend trace viewer to support your favorite trace format, or add domain specific visualizations to the UI to simplify drilling down into complex data.

Contributing, quick version

We welcome contributions! To hack on this code.

There are two type of tests.

In the browser

Run http server $CATAPULT/bin/run_dev_server. In any browser, navigate to http://localhost:8003/

Unit testsDescripton
All testshttp://localhost:8003/tests.html
All tests with short formathttp://localhost:8003/tracing/tests.html?shortFormat
An individual test suite(such as ui/foo_test.js)http://localhost:8003/tests.html?
Tests named foohttp://localhost:8003/tests.html?testFilterString=foo

On command

Unit testsDescription
All python tests$CATAPULT/tracing/bin/run_py_tests
All tracing tests in d8 environment$CATAPULT/tracing/bin/run_vinn_tests
All tests$CATAPULT/tracing/bin/run_tests

Make sure tests pass before sending us changelist. We use rietveld for codereview. For more details, esp on rietveld, read our contributing guide or check out the trace viewer wiki.

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