Selenium (Java & Python) Client Algorithm to read "Performance Statistics" from Chrome Dev Tool

[Debanjan Bhattacharjee]

Hello Everyone,

Wish you all a Merry Christmas.

I was trying to get some "Performance Statistics" from "Chrome Development Tool" through both Selenium Java & Python Clients.

What I observed, that the entries within IDE Console Output are 

1. Not in the same order
   
2. Length of both the Output varies in length.

So my question is, 

1. Is there a distinct Algorithm, which all the Selenium Clients follow while picking up the "Performance Statistics" parameters?
   
2. Does different Selenium Client follows different Algorithm while picking up "Performance Statistics" parameters?
3. If both the Selenium Client actually uses JavaScript why should the length vary?

Java Client Output :

[{redirectCount=0, encodedBodySize=218541, unloadEventEnd=0, responseEnd=2834.3800000000006, domainLookupEnd=1679.3400000000001, unloadEventStart=0, domContentLoadedEventStart=3062.82, type=navigate, decodedBodySize=218541, duration=7279.885, redirectStart=0, connectEnd=2219.0950000000003, toJSON={}, requestStart=2223.0450000000005, startTime=0, fetchStart=2702.4750000000004, domContentLoadedEventEnd=3072.8000000000006, entryType=navigation, workerStart=0, responseStart=2588.0200000000004, domInteractive=3062.775, domComplete=7271.39, domainLookupStart=1679.3400000000001, redirectEnd=0, transferSize=219089, connectStart=1679.3400000000001, loadEventStart=7272.015, secureConnectionStart=1779.905, name=http://www.google.com/, nextHopProtocol=..........

Python Client Output :

[{'connectEnd': 1506.0600000000002, 'connectStart': 1077.92, 'decodedBodySize': 218457, 'domComplete': 3273.585, 'domContentLoadedEventEnd': 2061.1000000000004, 'domContentLoadedEventStart': 2045.6950000000002, 'domInteractive': 2045.64, 'domainLookupEnd': 1077.92, 'domainLookupStart': 1077.92, 'duration': 3288.4300000000003, 'encodedBodySize': 218457, 'entryType': 'navigation', 'fetchStart': 1790.8600000000001, 'initiatorType': 'navigation', 'loadEventEnd': 3288.4300000000003, 'loadEventStart': 3274.57, 'name': 'http://www.google.com/', 'nextHopProtocol': 'h2', 

PS : I have trimmed the output till 'nextHopProtocol' as I understand here onwards the JavaScript and AJAX Calls comes into play.

Thanks and Regards

Dev

[Mohan Radhakrishnan]

    Is this the Selenium API ?

Thanks,

Mohan

[Debanjan Bhattacharjee]

Hi Mohan,

Thanks for the reply. Yes, I have used the "JavascriptExecutor" interface.

Thanks and Regards

Dev

[Mohan Radhakrishnan]

Hi Debanjan,

                        How do use this ? It would to be interesting if one wants to code an API to do some statistical calculations for capacity planning.

Thanks,

Mohan

[Debanjan Bhattacharjee]

Yes Mohan,

It's a Selenium API.

Thanks and Regards

DebanjanB

On Wednesday, December 27, 2017 at 3:37:40 PM UTC+5:30, Mohan Radhakrishnan wrote:

[Debanjan Bhattacharjee]

Hi Mohan,

Yes, we do take help of this API for pulling out Performance Statistics.

Thanks and Regards

DebanjanB