Re: [chromium-dev] GPU Profiler Traces not showing in Chrome-Beta for Android

[Tom Hudson]

I'm not entirely certain what your problem is.

One possibility, which I think is suggested by "data is there in the trace file, but it is unable to display": the json format for traces frequently has incompatible changes. You'll want to make sure you're loading the trace into a desktop Chrome (or TraceViewer) that is the same version as the version of Chrome for Android you took the trace with. Newer versions of Chrome/TraceViewer usually work, but not always. So grab a Canary or tip-of-tree build and see if you can load the trace there.

Open the Javascript console and see if there are any error messages? It's possible to corrupt your trace by, say, adding non-ASCII characters to a TRACE_EVENT that break JSON parsing, or failing to handle lifetimes of temporary strings properly and embedding random garbage into the files.

Another possibility: it's not clear from that command line what categories you're tracing.

On Fri, Dec 13, 2013 at 8:25 AM, Sohan Jyoti Ghosh <sohan...@samsung.com> wrote:

Hello,

We are not able to get trace diagram for latest beta or trunk code content shell for Android,

Data is there in the trace file, but it is unable to display.

Chrome Beta Version - 32.0.1700.58

Command Used: adb shell am broadcast -a com.chrome.beta.GPU_PROFILER_START -e file /sdcard/Download/trace.txt 

Can anyone give some input to fix it.

Thanks,

Sohan

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[Sami Kyostila]

Hi Sohan,

It sounds like you're trying to load the trace file in an older version of Chrome like Tom already pointed out. I just wanted to mention that the build/android/adb_profile_chrome script is a more convenient way to record traces on Android. See http://dev.chromium.org/developers/how-tos/trace-event-profiling-tool/recording-tracing-runs for instructions.

- Sami

[Sohan Jyoti Ghosh]

Thanks Tom and Sami,

I was indeed trying to load the trace in older chrome version.

But, as you pointed out, using ./build/android/adb_profile_chrome i am able to get the traces using old chrome as well.

I had to enable  --trace-cc, --trace-gpu though.

Thanks again,

Sohan

[Sohan Jyoti Ghosh]

Maybe I spoke too soon, the complete trace is still not available, Compositor/CompositorRasterWorker etc are still missing.

Looks like Browser Process is displayed, but the Render Process data isn't.

Thanks,

Sohan