gmintheoffice Reporter
	Description • 8 years ago

User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0
Build ID: 20160601155443

Steps to reproduce:

I run latest Firefox both 32 and 64 bit on different Win7 machines with minimum 8GB RAM.
I have hundreds of tabs open, though not all of them loaded. 
My daily routine involves opening/loading multiple (new) tabs, some of which JS and/or media heavy. Typical examples could be: Facebook, Youtube, Tumblr, Skyscrapercity, Soundcloud, ebay. I have a very few basic extensions/plugins: e.g. flash, adblock.


Actual results:

During the daily routine of loading new pages, RAM usage steadily increases. Once it hits 2GB, loading and displaying the pages significantly degrades: it takes a lot of time to load the page; content is not properly rendered, media/heavy/visual elements (e.g. pictures) are missing; Pages are loaded with some sort of white/blinking blocks (artifacts) on top of them.


Expected results:

While RAM usage could be expected to increase, I don't understand why after 2GB the browser function degrades. Certainly not on a system with 64bits and enough RAM. My only practical solution is to restart the browser as soon as it reaches 2GB of RAM and start it again. But given the hundreds of tabs, it usually starts already with 1GB of memory and it doesn't take too long to reach 2GB. Typically about once per day it, I need to restart it due to that reason.

	gmintheoffice Reporter
	Comment 1 • 8 years ago

https://blog.mozilla.org/nnethercote/2016/07/22/firefox-64-bit-for-windows-can-take-advantage-of-more-memory/#comment-46902

another report I believe for the same thing

	Eric Rahm [:erahm]
	Comment 2 • 8 years ago

Are you stuck with ESR 45 or is it possible to test the latest release [1] or even beta [2]? An about:memory report [3] would be useful when you are experiencing a slow down as well.

A profiler snapshot might also be helpful (only when you see a slowdown) in identifying what's causing the slowdown, you can create a recording with our built-in devtools by opening Tools > Web Developer > Performance.

[1] https://www.mozilla.org/firefox/channel/#firefox
[2] https://www.mozilla.org/firefox/channel/#beta
[3] https://developer.mozilla.org/en-US/docs/Mozilla/Performance/about:memory#How_to_generate_memory_reports

	gmintheoffice Reporter
	Comment 3 • 8 years ago

Currently using 45.2.0 already, though I only update via the officially released versions.

All the described negative effects seems to appear when approaching close and after turning 2GB of RAM usage. Truth to be told, sometimes it was not so annoying up till 2,4GB, but you can see that it took more to load or never really finished loading pages (e.g. missing content and the looping icon of the page tab).

p.s. on my other machine, now FF and plugin container appear separately in a ration something like 60:40. And I would experience similar difficulties once the combined usage goes over 2GB (i.e. 1,2gb + 0,8GB plugin container). Also in the past, occasionally the FF actually crashed. But this was month ago and maybe even 32bit version I was running for a while. Unfortunately it took me some years till I decided to complaint about this issue and have more structured observations.

I have to see if I can do recording. Never done this before. Is there any personal data collected in it? I can not provide such from the office.

	gmintheoffice Reporter
	Comment 4 • 8 years ago

this is a memory report from about:memmory I produced as requested, when first signs of decrease in behavior were noticed. Used RAM 2,2GB

	gmintheoffice Reporter
	Comment 5 • 8 years ago

(In reply to Eric Rahm [:erahm] from comment #2)
> Are you stuck with ESR 45 or is it possible to test the latest release [1]
> or even beta [2]? An about:memory report [3] would be useful when you are
> experiencing a slow down as well.
> 
> A profiler snapshot might also be helpful (only when you see a slowdown) in
> identifying what's causing the slowdown, you can create a recording with our
> built-in devtools by opening Tools > Web Developer > Performance.
> 
> [1] https://www.mozilla.org/firefox/channel/#firefox
> [2] https://www.mozilla.org/firefox/channel/#beta
> [3]
> https://developer.mozilla.org/en-US/docs/Mozilla/Performance/about:
> memory#How_to_generate_memory_reports

please see attachment

	Eric Rahm [:erahm]
	Comment 6 • 8 years ago

(In reply to gmintheoffice from comment #3)
> Currently using 45.2.0 already, though I only update via the officially
> released versions.

Okay it sounds like you're on an ESR release [1]. The latest official (non-extended support) release is 49.0.1 [2], if you feel comfortable you can try that out.

> p.s. on my other machine, now FF and plugin container appear separately in a
> ration something like 60:40.

It sounds like you're using a newer release that has e10s enabled, two processes are indeed expected.

> I have to see if I can do recording. Never done this before. Is there any
> personal data collected in it? I can not provide such from the office.

The profiler will include the names of the websites you are on. If you can't provide that a screenshot of the 'Waterfall' tab (that should be the default selection) might be helpful. It will tell me if we're spending a lot of time on garbage collection and/or cycle collection.

(In reply to gmintheoffice from comment #4)
> Created attachment 8800136 [details]
> memroy report at 2,2gb as requested
> 
> this is a memory report from about:memmory I produced as requested, when
> first signs of decrease in behavior were noticed. Used RAM 2,2GB

The interesting bits:

> 1,781.47 MB (100.0%) -- explicit
> ├────676.09 MB (37.95%) -- js-non-window
> │    ├──379.94 MB (21.33%) -- zones
> │    │  ├──295.17 MB (16.57%) ++ zone(0x76b000)
> │    │  ├───53.34 MB (02.99%) ++ zone(0x75e000)
> │    │  └───31.43 MB (01.76%) ++ (3549 tiny)
> │    ├──179.05 MB (10.05%) ++ gc-heap
> │    └──117.09 MB (06.57%) -- runtime
> │       ├───59.44 MB (03.34%) ── script-data
> │       └───57.66 MB (03.24%) ++ (12 tiny)
> ├────485.81 MB (27.27%) -- window-objects
> │    ├──313.22 MB (17.58%) ++ (522 tiny)
> │    ├───37.77 MB (02.12%) ++ top(<anonymized-8>, id=8)
> │    ├───28.48 MB (01.60%) ++ top(<anonymized-8062>, id=8062)
> │    ├───24.69 MB (01.39%) ++ top(<anonymized-8173>, id=8173)
> │    ├───21.80 MB (01.22%) ++ top(<anonymized-7898>, id=7898)
> │    ├───21.08 MB (01.18%) ++ top(<anonymized-957>, id=957)
> │    ├───19.79 MB (01.11%) ++ top(<anonymized-8085>, id=8085)
> │    └───18.99 MB (01.07%) ++ top(<anonymized-1385>, id=1385)

So we have 3,551 js-non-window zones, which seems like it could certainly affect performance. There also 529 top-level windows which seems quite high.

>        47.49 MB ── d3d11-shared-textures
>         0.99 MB ── gfx-surface-win32
>       308.57 MB ── gpu-committed
>       192.55 MB ── gpu-dedicated
>        61.27 MB ── gpu-shared
>       975.23 MB ── heap-allocated
>       997.71 MB ── heap-committed
>     1,463.00 MB ── heap-mapped
>     2,239.11 MB ── resident-unique

The delta between resident-unique and heap-committed is quite high (1.2GB).

[1] https://www.mozilla.org/firefox/organizations/
[2] https://www.mozilla.org/firefox/49.0.1/releasenotes/

	Eric Rahm [:erahm]
	Comment 7 • 8 years ago

gmintheoffice, it might be helpful to get the output of 'about:support', just navigate to about:support in your URL bar, then click 'copy text to clipboard' and you can paste the output here. Then  I suspect you may have some addons that are causing you issues.

On the other hand if your really do have 529 tabs open it's not unexpected for things to slow down.

	gmintheoffice Reporter
	Comment 8 • 8 years ago

(In reply to Eric Rahm [:erahm] from comment #7)
> gmintheoffice, it might be helpful to get the output of 'about:support',
> just navigate to about:support in your URL bar, then click 'copy text to
> clipboard' and you can paste the output here. Then  I suspect you may have
> some addons that are causing you issues.
> 
> On the other hand if your really do have 529 tabs open it's not unexpected
> for things to slow down.

Hi, please find under the report. I obscured few personal information, but didn't remove content. Currently it is running on 2,4GB and I can't load a new page (the tab is blank and the icon is loading).

As for the tabs, I know I have many on the bar, but I am honestly surprised that they are over 500. I checked and this number probably is correct. However, only fraction of this is actually loaded! I mean isn't this the whole point of the option to load only when touched? I would expect tabs on the bar that are haven't yet been touched (under the current session/since last restart) to use if not 0 resources at least close to that!

p.s. unfortunately on this machine I can not choose what version of FF to use. If such tests are really necessarily, I could try on the other machine (with the two processes - "e10s enabled").

Detour: Please note that though I am an IT professional, I have no (dev) knowledge about FF and web browsers in general nor open source in that matter. My only desire and hope is to help improve the behavior and the performance of my beloved browser and provide as much constructive feedback as possible. Btw I am much unhappy about the Chrome I occasionally use and stumble much worse performance. For some reason it creates a separate process for each tab and they consume few hundreds gigs of RAM each. Needless to say, after just one or two dozens tabs it screws its and my machine's performance. Therefore FF is light years ahead for me, but it can still go better. To say it again, given that memory is in abundance, I don't see why reaching over 2GB causes problems.

Application Basics
------------------

Name: Firefox
Version: 45.4.0
Build ID: 20160905130425
Update Channel: esr
User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0
Multiprocess Windows: 0/3 (default: false)
Safe Mode: false

Crash Reports for the Last 3 Days
---------------------------------

All Crash Reports

Extensions
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Name: Adblock Plus
Version: 2.7.3
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ID: {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}

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--------

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----------------------------

JavaScript
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-------------

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Experimental Features
---------------------

	Eric Rahm [:erahm]
	Comment 9 • 8 years ago

Can you try disabling a few addons to see if those are causing issues?
  - Forecastfox
  - Session Manager

If possible you could try updating AdBlock Plus, the latest version is 2.8.1 and older versions have been known to have memory impact before.