Telemetry: Run Benchmarks Locally

Set Up

If you just want Telemetry, cloning catapult repository should be enough. If you also want the Chrome benchmarks built with Telemetry, get the latest Chromium checkout. If you‘re running on Mac OS X, you’re all set! For Windows, Linux, Android, or Chrome OS, read on.


Some benchmarks require you to have pywin32. Be sure to install a version that matches the version and bitness of the Python you have installed.


Telemetry on Linux tries to scan for attached Android devices with adb. The included adb binary is 32-bit. On 64-bit machines, you need to install the libstdc++6:i386 package.


Running on Android is supported with a Linux or Mac OS X host. Windows is not yet supported. There are also a few additional steps to set up:

  1. Telemetry requires adb. If you‘re running from the zip archive, adb is already included. But if you’re running with a Chromium checkout, ensure your .gclient file contains target_os = [‘android’], then resync your code.
  2. If running from an OS X host, you need to run ADB as root. First, you need to install a “userdebug” build of Android on your device. Then run adb root. Sometimes you may also need to run adb remount.
  3. Enable debugging over USB on your device.
  4. You can get the name of your device with adb devices and use it with Telemetry via --device=<device_name>.

Chrome OS

See Running Telemetry on Chrome OS.

Benchmark Commands

Telemetry benchmarks can be run with run_benchmark.

In the Telemetry zip archive, this is located at telemetry/run_benchmark.

In the Chromium source tree, this is located at src/tools/perf/run_benchmark.

Running a benchmark

List the available benchmarks with telemetry/run_benchmark list.

Here's an example for running a particular benchmark:

telemetry/run_benchmark --browser=canary smoothness.top_25_smooth

Running on another browser

To list available browsers, use:

telemetry/run_benchmark --browser=list

For ease of use, you can use default system browsers on desktop:

telemetry/run_benchmark --browser=system

and on Android:

telemetry/run_benchmark --browser=android-system-chrome

If you‘re running telemetry from within a Chromium checkout, the release and debug browsers are what’s built in out/Release and out/Debug, respectively.

To run a specific browser executable:

telemetry/run_benchmark --browser=exact --browser-executable=/path/to/binary

To run on a Chromebook:

telemetry/run_benchmark --browser=cros-chrome --remote=[ip_address]


To see all options, run:

telemetry/run_benchmark run --help

Use --pageset-repeat to run the test repeatedly. For example:

telemetry/run_benchmark smoothness.top_25 --pageset-repeat=30

If you want to re-generate HTML results and add label, you can do this locally by using the parameters --reset-results --results-label="foo"

telemetry/run_benchmark smoothness.top_25 --reset-results --results-label="foo"

####Comparing Two Runs

telemetry/run_benchmark some_test --browser-executable=path/to/version/1 --reset-results --results-label="Version 1"

telemetry/run_benchmark some_test --browser-executable=path/to/version/2 --results-label="Version 2"

The results will be written to in the results.html file in the same location of the run_benchmark script.