Hi Micheal,

You have to enable additional tracing categories to get the detailed 
RuntimeCallStats, see this slidedeck for detailed 
instructions: 
https://docs.google.com/presentation/d/1Lq2DD28CGa7bxawVH_2OcmyiTiBn74dvC6vn2essroY/edit?usp=sharing

As for the telemetry tests, I think you'd have to manually go and change 
the benchmark to add the additional tracing categories.

We currently don't distinguish when optimizing/interpreted code is run, 
essentially this is all grouped under "JavaScript".

I hope this helps.

Cheers,
Camillo

On Monday, September 4, 2017 at 2:52:15 PM UTC+2, michael lee wrote:
>
> Hi guys,
>
>
> I want to find out the JavaScript execution details by V8.  Anyone knows 
> how to  figure out  v8 execute Javascript (real-world pages) in detail, 
> i.e. when interprets? when compiles?
>
>
> For example, running a Telemetry benchmark with tracing:
>
>  $ tools/perf/run_benchmark --browser=android-chromium 
> smoothness.top_25_smooth --story-filter=yahoo --output-format html 
> --output-format json 
>
> then 4 html trace files and 1 json file are generated: 
>  http___answers_yahoo_com22017-09-01_15-36-05.html 
>
>
>
>
> <https://lh3.googleusercontent.com/-TFw9mqDAvYg/Wa1K6i96_VI/AAAAAAAAAAM/-iVNZjQO6_M4_tzMOW9jKHVVY6DskpmrACLcBGAs/s1600/Screenshot%2Bfrom%2B2017-09-04%2B14%253A45%253A10.png>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> This trace file provides the overall JavaScript execution information, 
> but not the details.
> Title Tab.ExecuteJavaScript
> User Friendly Category other
> Start 7,861.667 ms
> Wall Duration 466.510 ms
> Self Time 0.166 ms
> How can I get the information of JavaScript execution details? Do you 
> have any advice for this?
>
> Thanks in advance!
>
>
> Best Regards,
> Michael
>

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