What is "tts" in the timeline profile data

[Srinivas Kowtal]

Hello,

I am trying to do some analysis using the data from timeline view. I would like to know the following details:

1. what is  "ts" field? I think it is the start time of the corresponding function, but correct me if I am wrong. Also can you confirm it is in nanoseconds.

2. what is "tts" field? I don't know what this field is and what its units are.

3. Just above the "MainThread" time line in the timeline view, we can see the frame duration is displayed in the form of a film tape. I would like to know how I can extract the same data from the json file? 

If there is a developer link which explains all the details about the timeline json format and how the frame duration are calculated please do share it.

Example section of timeline json file:

  {

    "pid": 26990,

    "tid": 210,

    "ts": 7079862683,

    "ph": "I",

    "cat": "disabled-by-default-devtools.timeline",

    "name": "RequestAnimationFrame",

    "args": {

      "data": {

        "id": 26796,

        "frame": "0x3abfa1c7c000",

        "stackTrace": [

          {

            "functionName": "",

            "scriptId": "215",

            "url": "http://webglsamples.org/tdl/webgl.js",

            "lineNumber": 557,

            "columnNumber": 35

          },

          {

            "functionName": "tdl.webgl.requestAnimationFrame",

            "scriptId": "215",

            "url": "http://webglsamples.org/tdl/webgl.js",

            "lineNumber": 569,

            "columnNumber": 20

          },

          {

            "functionName": "render",

            "scriptId": "205",

            "url": "http://webglsamples.org/aquarium/aquarium.js",

            "lineNumber": 1591,

            "columnNumber": 31

          }

        ]

      }

    },

    "tts": 215998281,

    "s": "g"

  },

Best regards

Srini

[Pavel Feldman]

https://docs.google.com/document/d/1CvAClvFfyA5R-PhYUmn5OOQtYMH4h6I0nSsKchNAySU has the format description.

As for the frame duration, it takes many signals and non-trivial logic to compute that. Here is the code for it: https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit/Source/devtools/front_end/timeline/TimelineFrameModel.js&q=TimelineFrameModel&sq=package:chromium&type=cs&l=34

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[Srinivas Kowtal]

Thanks for the links. it is very helpful.

Regards

Srini

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[PhistucK]

I do not (immediately) see "tts" mentioned in the document. It is a property name, not a value, so I expect to find it using a simple search and could not... Am I assuming incorrectly that properties are not dynamically named (or, at least, this property)?

Can you point me to the part that discusses "tts"?

☆PhistucK

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[Jonathan Garbee]

>  "tts": 215998281,

Second to last property.

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[Jonathan Garbee]

Sorry, sent too quickly.

To finish that last email, I also do not see any document pointed out with details Phistuck. Are you looking at something in particular or do you mean the example JSON document?

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[Jonathan Garbee]

Digging into the source code on this one, from a quick view "TTS" appears to be the time duration of the thread. Pulling this just from the name of the property it is assigned to if found.

[1] https://code.google.com/p/chromium/codesearch#chromium/src/tools/telemetry/telemetry/timeline/trace_event_importer.py&q=timeline%20tts&sq=package:chromium&type=cs&l=318

[PhistucK]

Really, I just wanted an answer to the question the original poster asked ('2. what is "tts" field? I don't know what this field is and what its units are.') and I expected the document to which Pavel linked to have the answer (and to understand the abbreviation as well), but I could not find it. It was out of interest and curiosity, rather than an actual need (I do not look at the timeline profile data JSON).

☆PhistucK

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[Jonathan Garbee]

Ok, and I'm sorry for being so confusing. Checking the web thread I noticed Pavel did link to a fantastic document covering the spec. That email wasn't showing for me in Inbox however. Moved to another address for this group to hopefully clear up any confusion like that in the future.

I'll also do some digging and see if we can't improve the doc with this information. It would be useful to have everything in the export mentioned (unless this is experimental stuff and should be ignored for now.)

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[PhistucK]

You were not confusing, you were helpful, actually. :)

I appreciate the work you put into improving the documentation. :)

Thank you.

☆PhistucK

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[Yao Zuo]

https://stackoverflow.com/questions/38550396/timestamp-in-chrome-devtool-s-timeline-json

I've confirmed the answer is true. I'm curious why doesn't it show epoch? How is "time since OS boot" useful?