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Trace Viewer Logo

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 tests Descripton
All tests http://localhost:8003/tests.html
All tests with short format http://localhost:8003/tracing/tests.html?shortFormat
An individual test suite(such as ui/foo_test.js) http://localhost:8003/tests.html?testSuiteName=ui.foo
Tests named foo http://localhost:8003/tests.html?testFilterString=foo

On command

Unit tests Description
All python tests $CATAPULT/tracing/bin/run_py_tests
All tracing tests in d8 environment $CATAPULT/tracing/bin/run_vinn_tests
All tracing tests in devserver environment $CATAPULT/tracing/bin/run_devserver_tests
All tests $CATAPULT/tracing/bin/run_tests

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

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