819756 - Abnormal memory usage on some Google+ profile pages

Status: RESOLVED INCOMPLETE

(Core :: General, defect)

Description

[Matteo Sasso]

Attachment: screenshot-firefox-mem-usage.png

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20100101 Firefox/17.0
Build ID: 20121128204232



Actual results:

Some profile pages on Google+ (but not all of them, can't seem to find a pattern) use up a lot of memory (about 2GB) when I switch to that tab. The memory is freed when I switch to another tab (but not all of it, which suggests some amount of leaking).

The graph attached shows memory usage when switching to the offending tab and back.

I browsed around and quickly found another profile with this problem, although in that case the problem isn't so severe (and might go unnoticed on computers with lots of RAM). In that case the tab uses about 1GB.

The worst offender is this profile: https://plus.google.com/u/0/105618504628985021635/posts

However I cannot say for sure if the problem will show up again when people try to confirm the bug.

Comment 1

[Matteo Sasso]

The problem persists in safe mode, btw.

Comment 2

[Matteo Sasso]

Attachment: about:memory with the offending tab on focus

I managed to reload the about:memory tab while keeping focus on the offending tab and here's the result.

Comment 3

[(mostly gone) XtC4UaLL [:xtc4uall]]

Confirmed using Mozilla/5.0 (Windows NT 6.1; WOW64; rv:20.0) Gecko/20121209 Firefox/20.0 ID:20121209030817

Quote of about:memory?verbose

1,645,200,460 B ── explicit
            0 B ── gfx-d2d-surfacecache
    4,199,948 B ── gfx-d2d-surfacevram
    6,354,136 B ── gfx-d2d-vram-drawtarget
      842,044 B ── gfx-d2d-vram-sourcesurface
1,416,051,040 B ── gfx-surface-image
              0 ── ghost-windows
1,616,548,500 B ── heap-allocated
1,622,601,728 B ── heap-committed
    6,014,182 B ── heap-committed-unused
          0.37% ── heap-committed-unused-ratio
    2,654,208 B ── heap-dirty
   80,010,346 B ── heap-unused
1,415,190,736 B ── images-content-used-uncompressed
   27,262,976 B ── js-gc-heap
              0 ── low-commit-space-events
1,708,830,720 B ── private
1,014,583,296 B ── resident
    4,798,200 B ── storage-sqlite
2,092,380,160 B ── vsize

Comment 4

[Nicholas Nethercote [inactive]]

1,415,190,736 B ── images-content-used-uncompressed

That's a lot of images.  Are these just image-heavy pages?  Do you need to scroll a lot to see this?

Comment 5

[(mostly gone) XtC4UaLL [:xtc4uall]]

Weird. Whilst trying to find a specific Post causing the Issue in given Link of Comment 0 I cannot repro this anymore; neither using today's nor past Nightlies nor Firefox 17.

I tried this on two Windows 7 Boxes I could repro the Issue before.

Matteo can you confirm this and perhaps provide another Google+ Profile exhibiting the Issue?

(In reply to Nicholas Nethercote [:njn] from comment #4)
> Do you need to
> scroll a lot to see this?

There was no Scrolling necessary as Google+ Profiles kind of get auto-expanded during Loading.

Comment 6

[Matteo Sasso]

Many profiles were affected before, to different degrees, but now something must have changed and I cannot reproduce the problem anymore.

I should have dumped the offending page, sorry.

Comment 7

[(mostly gone) XtC4UaLL [:xtc4uall]]

(In reply to Matteo Sasso from comment #6)
Ok, this makes this Report worthless/non-actionable now, no?

Comment 8

[Matteo Sasso]

Yep, unless you can convince Google to roll back their changes ;)

Happy hacking to all Memshrink guys, keep it up!

Comment 9

[(mostly gone) XtC4UaLL [:xtc4uall]]

Resolving per above Comments.