1699830 - Web content process consumes 2GB of memory when browsing on Facebook

Status: REOPENED

(Core :: JavaScript Engine, defect, P2)

Description

[Max]

Attachment: memory-report.json.gz

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:86.0) Gecko/20100101 Firefox/86.0

Steps to reproduce:

Browsing on internet

Actual results:

Firefox is using more than 4.5 Gb of ram.

Expected results:

Firefox do not use as usualy large amount of ram

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::Performance' component, and is moving the bug to that component. Please revert this change in case you think the bot is wrong.

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug is invalid.
If you think the bot is wrong, please reopen the bug and move it back to its prior component.

Be aware this is a production bug database used by the Mozilla community to develop Firefox, and other products.
Filing test bugs here wastes the time of all our contributors, volunteers, as well as paid employees.
If you continue to abuse bugzilla.mozilla.org your account will be disabled.

Comment 3

[Henrik Skupin [:whimboo][⌚️UTC+1]]

The Facebook web content process consumes most of the memory. Here details from the memory report:

1,834.04 MB (100.0%) -- explicit
├──1,161.61 MB (63.34%) -- window-objects
│  ├──1,109.33 MB (60.49%) -- top(https://www.facebook.com/, id=38)
│  │  ├──1,011.64 MB (55.16%) -- active
│  │  │  ├──1,010.37 MB (55.09%) -- window(https://www.facebook.com/)
│  │  │  │  ├────928.43 MB (50.62%) -- js-realm(https://www.facebook.com/)
│  │  │  │  │    ├──906.06 MB (49.40%) -- classes
│  │  │  │  │    │  ├──554.72 MB (30.25%) -- class(Object)/objects
│  │  │  │  │    │  │  ├──374.27 MB (20.41%) ── gc-heap
│  │  │  │  │    │  │  └──180.45 MB (09.84%) -- malloc-heap
│  │  │  │  │    │  │     ├──180.22 MB (09.83%) ── slots
│  │  │  │  │    │  │     └────0.23 MB (00.01%) ── elements/normal
│  │  │  │  │    │  ├──120.77 MB (06.59%) -- class(Function)/objects
│  │  │  │  │    │  │  ├──119.34 MB (06.51%) ── gc-heap
│  │  │  │  │    │  │  └────1.43 MB (00.08%) ── malloc-heap/slots
│  │  │  │  │    │  ├──114.63 MB (06.25%) -- class(Array)/objects
│  │  │  │  │    │  │  ├──112.35 MB (06.13%) ── gc-heap
│  │  │  │  │    │  │  └────2.28 MB (00.12%) ++ malloc-heap
│  │  │  │  │    │  ├───94.39 MB (05.15%) -- class(Call)/objects
│  │  │  │  │    │  │   ├──90.10 MB (04.91%) ── gc-heap
│  │  │  │  │    │  │   └───4.29 MB (00.23%) ── malloc-heap/slots
│  │  │  │  │    │  └───21.55 MB (01.17%) ++ (28 tiny)
│  │  │  │  │    └───22.37 MB (01.22%) ++ (7 tiny)
│  │  │  │  ├─────60.56 MB (03.30%) -- dom
│  │  │  │  │     ├──52.48 MB (02.86%) ── orphan-nodes
│  │  │  │  │     └───8.08 MB (00.44%) ++ (8 tiny)
│  │  │  │  ├─────21.13 MB (01.15%) ++ layout
│  │  │  │  └──────0.25 MB (00.01%) ── property-tables
│  │  │  └──────1.27 MB (00.07%) ++ (2 tiny)
│  │  └─────97.69 MB (05.33%) -- js-zone(0x1e91bb88000)
│  │        ├──54.61 MB (02.98%) ++ (14 tiny)
│  │        └──43.08 MB (02.35%) ++ strings
│  └─────52.29 MB (02.85%) -- top(none)/detached
│        ├──36.44 MB (01.99%) ++ window(https://www.facebook.com/videocall/incall/?peer_id=100002239680892)
│        └──15.85 MB (00.86%) ++ window(https://www.facebook.com/videocall/incall/?peer_id=100005678298673)
├────448.69 MB (24.46%) -- js-non-window
│    ├──377.46 MB (20.58%) -- zones
│    │  ├──342.63 MB (18.68%) -- zone(0x1e91b44b000)
│    │  │  ├──342.18 MB (18.66%) -- strings
│    │  │  │  ├──175.31 MB (09.56%) -- string(<non-notable strings>)
│    │  │  │  │  ├──158.67 MB (08.65%) -- malloc-heap
│    │  │  │  │  │  ├──158.56 MB (08.65%) ── latin1
│    │  │  │  │  │  └────0.11 MB (00.01%) ── two-byte
│    │  │  │  │  └───16.64 MB (00.91%) ++ gc-heap
│    │  │  │  └──166.88 MB (09.10%) ++ (3129 tiny)
│    │  │  └────0.45 MB (00.02%) ++ (4 tiny)
│    │  └───34.83 MB (01.90%) ++ (6 tiny)
│    ├───44.70 MB (02.44%) ++ runtime
│    ├───26.50 MB (01.44%) ++ gc-heap
│    └────0.03 MB (00.00%) ++ (2 tiny)
├────123.74 MB (06.75%) ── heap-unclassified
├─────40.20 MB (02.19%) ++ (22 tiny)
├─────36.18 MB (01.97%) -- heap-overhead
│     ├──19.76 MB (01.08%) ++ bin-unused
│     └──16.42 MB (00.90%) ++ (2 tiny)
└─────23.61 MB (01.29%) -- images
      ├──23.56 MB (01.28%) -- content
      │  ├──22.70 MB (01.24%) -- raster/used
      │  │  ├──20.21 MB (01.10%) ++ progress=10f
      │  │  └───2.49 MB (00.14%) ++ (4 tiny)
      │  └───0.86 MB (00.05%) ++ vector/used/progress=18f
      └───0.05 MB (00.00%) ++ (2 tiny)

Andrew, do you see any obvious usage here? Maybe it's just a long-time open tab with continuous fetches of more content?

Comment 4

[Andrew McCreight [:mccr8]]

We've got a bunch of similar bugs on file for Facebook.