Closed Bug 849743 Opened 7 years ago Closed 5 years ago

Huge memory usage during long running Firefox, with 24 extensions enabled


(Core :: General, defect)

23 Branch
Not set





(Reporter: kami911, Unassigned)



(Whiteboard: [MemShrink:P3])


(4 files)

I am using Nightly, with a few of my favorite extension. I am lazy when I am browsing, and I close already read tabs later. Time by time it happens my Nightly eats 3 Gig of ram that sounds crazy. I am enclosing two about:memory verbose dump

1) Unnecessary tabs are closed (initally I had 80 tabs opened then down to 30)
2) Nightly restarted and all on demands tab are selected (to reload its contents)

Is it possible to track more precisly what casuses about 1 GB difference between 1 and 2. Generally my Nightly is memory hungry, it uses near 1GB memory with 10 pinned tabs. When I reset profil I have much better experience, but when I reenable sync all thing go to the wrong direction. How can I figure out what's wrong my synced profile?
Whiteboard: [memshrink]
This is an interesting report, but there's not quite enough useful to make any kind of useful progress.

First, which add-ons do you have enabled?

Also, in the first about:memory you have 400 MiB in the page, but only 7 MiB in the second page.

In terms of getting accurate diffs between measurements, we have a script for diffing JSON memory report dumps, but we need to expose that to users (bug 848560).
Depends on: 848560
I can retest it during the weekend. I will start it on Friday, and report it to you on Monday. During this period I will not use the machine, just leave the tabs open. Unfortunately I got an another bug that causes segmentation fault. I try to update when it is get fixed: 851806

I have separated bug for page under 838087

I will provide JSON about:memory.
> I will provide JSON about:memory.

Unfortunately there's no easy way to trigger the JSON dump.  That's why this depends on bug 848560.
Then I will wait it :o) Thanks!
Is memchaser logfile is useful for you? I logged it during the weekend while memory usage went from 1,4 GiB to 2,5 GiB. Of course I haven't used the box.
After 3 day long weekend:
u     21233 82.9 80.7 7547736 4938100 ?     Dl   Mar29 4526:59 /usr/lib/firefox-trunk/firefox-trunk
u     21318 11.3  1.2 1092812 79364 ?       Sl   Mar29 621:04 /usr/lib/firefox-trunk/plugin-container /usr/lib/adobe-flashplugin/ -greomni /usr/lib/firefox-trunk/omni.ja -appomni /usr/lib/firefox-trunk/browser/omni.ja -appdir /usr/lib/firefox-trunk/browser 21233 plugin
u     21358  0.0  0.0 279804   232 ?        Sl   Mar29   4:20 /usr/lib/firefox-trunk/plugin-container /opt/google/talkplugin/ -greomni /usr/lib/firefox-trunk/omni.ja -appomni /usr/lib/firefox-trunk/browser/omni.ja -appdir /usr/lib/firefox-trunk/browser 21233 plugin
MemShrink:P3 until we get more data via bug 848560.
Whiteboard: [memshrink] → [MemShrink:P3]
Bug 848560 has landed.  Thanks for waiting.

Can you update to the latest Nightly and use the "Write reports to a file" button at the bottom of about:memory to take measurements before and after?  Thanks!

And I see you have 24 extensions enabled.  It's extremely likely one of them is the problem.  MemChaser (ironically enough) has been seen to cause increases in memory consumption in the past.  I'd suggest you disable it before doing measurements.
Flags: needinfo?(kami911)
Summary: Huge memory usage during long running Firefox → Huge memory usage during long running Firefox, with 24 extensions enabled
I can't see the feature on the current Nightly PPA (Ubuntu). I will try tomorrow.
Flags: needinfo?(kami911)
Flags: needinfo?(kami911)
Can I send the reports privately? I was not able to reproduce the problem during the weekend, but today I got 2,8 GB memory usage of Firefox. Restarting FF, and waiting all tab to load takes aroun 1,8 GB.
Flags: needinfo?(kami911)
Flags: needinfo?(kami911)
> Can I send the reports privately?

Sure, send them to my email address (hover over my user name above to see it).  Is it ok if I post interesting snippets of the data?  I'll make sure I scrub any URLs.
Sent. You can do it as you wrote.
Flags: needinfo?(kami911)
Kami sent me two memory report dumps, one after browsing for a while, and one after restarting and reloading the open tabs.

On restart, enough tabs were open and extensions in use that "explicit" was 1,756.  In the "high usage" dump, "explicit" had climbed to 2,737 MiB.  There was a Facebook tab that grew a bit and multiple (I think) gmail tabs that also grew, plus some other stuff.  And 160 MiB of orphan nodes spread across various tabs.  I didn't see anything suspicious relating to extensions.

So I think overall it's mostly a combination of fragmentation and sites just holding onto more data as they're used for long periods.  Generational GC (bug 619558) will help but I don't see anything else to chase here.
Attached file Before
Attached file After
Hi Nicholas,
I attach an another case, on same machine. Can you check it? The difference is ~ 400 MB. How can I easily compare the memory reports?
Version: 22 Branch → 23 Branch
Recent versions of Nightly have a way to save memory reports to a compressed format, and also diff them.  It is in about:memory.
Old version. I will open a new one if required.
Closed: 5 years ago
Resolution: --- → WONTFIX
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