How to measure full-screen FPS on Chrome OS?

[Adam]

Hi,

I am trying to measure full-screen FPS on Chrome OS. Specifically, I am seeing low FPS (by eye) when entering/leaving window overview mode, and I would like to get some measurements to help understand the issue. See https://bugs.chromium.org/p/chromium/issues/detail?id=537050.

Are there any suggested software or hardware solutions for measuring FPS on Chrome OS?

An ideal situation would be if we had performance bots that did a Digital Foundry-style analysis (see http://www.eurogamer.net/articles/digitalfoundry-2015-how-we-measure-console-frame-rate) and could detect FPS, tearing, and jitter issues during testing.

Thanks,

Adam

[Jeremy Roman]

I think the switch "--ui-show-fps-counter" will show you the frame rate (and a few other things) for the browser (UI) compositor.

[Adam Goode]

Can I trigger this from chrome://flags/ ?

I want to test it on a verified mode chromebook.

Thanks,

Adam

[Brandon Jones]

It used to be available through about:flags but got removed in favor of a checkbox in dev tools. Open the inspector (Right click+Inspect), Press Esc to show the console panel on the bottom, click the three dot menu to the left side of that, and click "Rendering". In that tab there's a "Show FPS Meter" checkbox.

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[Adam Goode]

That works for a tab, but I want to measure cross-window (full compositor) FPS. I will have to try the command line flag, but don't have access to a dev-mode chromebook this week.

Something like this, but without external hardware:

https://www.youtube.com/watch?v=KVg19CbkXR4

Adam

[Dana Jansens]

On Fri, Apr 22, 2016 at 2:49 PM, Adam <ago...@chromium.org> wrote:

Hi,

I am trying to measure full-screen FPS on Chrome OS. Specifically, I am seeing low FPS (by eye) when entering/leaving window overview mode, and I would like to get some measurements to help understand the issue. See https://bugs.chromium.org/p/chromium/issues/detail?id=537050.

Are there any suggested software or hardware solutions for measuring FPS on Chrome OS?

Take a trace and look at the period of the display compositor drawing/swapping.

[Dongseong Hwang]

--ui-show-fps-counter is removed in chrome://flags.

As you use ChromeOS, add --ui-show-fps-counter to /etc/chrome_dev.conf file.

-DS