Profiling with PhantomJS

[Dav Glass]

I've been thinking of ways to help developers with simple profiling of their tests/pages with Phantom.

I'm not familiar with the code base, but here's what I'm thinking..

Patch the console.profileEnd(); to return a JSON object of the profiler data that we can programatically access from JS. Then the person wrapping/using Phantom can report the results. Print them, log them, etc..

Thoughts?

[Ivan De Marino]

Sounds intereting.

Let's see some code ;)

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Ivan De Marino

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[Ariya Hidayat]

To help me imagining this case, can you try to write an exemplary
script of that profiling assuming the functionality is already
implemented?

Something slightly related:
http://code.google.com/p/phantomjs/issues/detail?id=386 (Make Web
Inspector back-end functionalities available at run-time).



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Ariya Hidayat, http://ariya.ofilabs.com
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[James Greene]

I would also like to see a quick usage example.
~~James

[Owen Davis]

One of my co-workers wrote a tool to capture a lot of performance data (like google page speed or yslow does) using phantom.   It should give you a pretty good idea of what metrics you can collect without having to patch anything, and it optionally emits json and csv.

https://github.com/macbre/phantomas

[Dav Glass]

Basically, I want to be able to do this inside of a test file:

console.profile('foo');
//Some code
console.profileEnd('foo');

Then when run through Phantom be able to access the data from that
profile (in JSON) and write it out to disk so I can store and compare
it later.

As far as I can tell, that data is not exportable in a programatic
way, it's always sent to the Web Inspector panel to display the tree.

Dav


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Dav Glass
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[James Greene]

Cool, that sounds good and practical to me.

Note: In addition to the issue that Ariya already mentioned (#386), I'd say this is also somewhat related to http://code.google.com/p/phantomjs/issues/detail?id=232 (Support more console methods)

The latter relation concerns me as I've always been surprised that these console methods aren't already available via WebKit/QtWebKit.  Ariya, any idea how to get them there?  I would've assumed it was just some build config item that needs to be added but perhaps it's deeper than that.

~~James