1371661 - Google image search profile

Status: NEW

(Core :: JavaScript: GC, enhancement, P3)

Description

[Filip Andrei]

1.Access google.ro
2.Search for fox
3.Start Gecko profile
4.Click images 
5.Share profile


Gecko profile:
https://perfht.ml/2r2ih2b

Comment 1

[Bobby Chien]

Miko, could you help to have first profiling? Thanks.

Comment 2

[Miko Mynttinen]

Although the profile display list creation times are pretty high (>5ms), nothing really stands out.

Filip: Would it be possible to get the profile with a higher sampling interval than 1ms (for example 0.3ms)?

Comment 3

[Filip Andrei]

Hi Miko here is the profile with 0.3 interval :http://bit.ly/2u45jCE

Comment 4

[Miko Mynttinen]

(In reply to Filip Andrei from comment #3)
> Hi Miko here is the profile with 0.3 interval :http://bit.ly/2u45jCE

Thank you. Unfortunately, the profile seems to be still missing some data, for example the segment here: https://perf-html.io/public/9325a584e58d90662b7762f1db976f86c78bb52f/calltree/?hiddenThreads=&implementation=cpp&invertCallstack&range=4.1584_8.9250~6.0152_8.5511~6.6596_6.6793&thread=2&threadOrder=0-2-3-5-1-4 is 20ms, but only 1.5ms is accounted for.
Could you please try increasing the profiler buffer size to something like 50MB to see if it makes a difference?

Comment 5

[Filip Andrei]

I modified the buffer size to 540 mb and that is the max size i have on the Acer hardware

http://bit.ly/2s9NBfM

Comment 6

[Miko Mynttinen]

Thank you Filip. Based on these profiles, there does not seem to be any obvious optimization opportunities.

Comment 7

[Bobby Chien]

filip, could you help to provide more clues to show the performance issue? Or we could close the bug and wait another symptom shows up. Thanks.

Comment 8

[Filip Andrei]

I tooked another profile where i think that the slow response is more evidenced and the only based criteria is that is a lot slower than Chrome.Can you please take a look at this https://perfht.ml/2sosV3L.

Comment 9

[Bobby Chien]

David, could you help to follow Filip's new profile in Comment 8? Thanks.

Comment 10

[David Anderson [:dvander] - inactive, e-mail if emergency]

I don't really see anything actionable in this profile. It looks like the content process wants some information about cookies and is waiting for the UI to reply. The UI is spending a good deal of time running UI javascript and doing UI reflows/paints. Maybe "why do cookies need to contact the main thread" is a valid question, but maybe there is also a scheduling problem in the parent process.

Comment 11

[Bill McCloskey [inactive unless it's an emergency] (:billm)]

Filip, is it possible you were experiencing page faults when you took the profile in comment 8? How much RAM do you have and how many tabs do you think you had open?

Comment 12

[Markus Stange [:mstange]]

Here's a profile of the steps in comment 0 with tweaked dom.ipc.processCount prefs so that there's only one content process, and the profiling interval set to 2ms.
These settings seem to produce profiles that have fewer gaps in them.

https://perfht.ml/2eOQYan

I've also enabled stylo.

Comment 13

[Bobby Chien]

Andreas, could you also help to continue the investigation? Thanks.

Comment 14

[Andreas Farre [:farre]]

I'm currently on PTO. Can help out in the week after next. Keeping the needinfo set to remind me.

Comment 15

[Bobby Chien]

Hi Andreas, could you help the profiling? thanks.

Comment 16

[Andreas Farre [:farre]]

I re-ran the test on the Acer hardware, again with profile interval set to 2 ms:

http://bit.ly/2wLJk8e

and I see a bunch of GeckoMain delays as well as a bunch of Content delays. If I'm reading the profile correctly the reasons seems to be ipc waiting for GC, CC, painting. Not sure what more to say.

Comment 17

[Bobby Chien]

tracking under quantum flow