1940206 - Garbage collection is less efficient on macOS(ARM) than on Linux(x86)

Status: UNCONFIRMED

(Core :: Performance: Memory, defect)

Description

[Guo Yunhe]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:133.0) Gecko/20100101 Firefox/133.0

Steps to reproduce:

I have a TamperMonkey script to open/close web pages (every 3 second) for me. The script works fine on Firefox Linux (x86). But when I run the same script on macOS (ARM, M3 Pro), Firefox is getting slower and slower. With Firefox's built-in Task Manager, I can see that after an hour, the memory usage is up to 7GB! Performance profiler shows that Firefox waste most CPU time on garbage collection but garbage is still increasing:

https://profiler.firefox.com/from-browser/calltree/?globalTrackOrder=0&hiddenLocalTracksByPid=19390-0wrtwx1&implementation=js&thread=0&v=10

Actual results:

Memory and CPU usage keep increasing. Firefox becomes slower and less responsible to user interaction.

Expected results:

Memory usage shouldn't be increasing.

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 correct in case you think the bot is wrong.

Comment 2

[Mayank Bansal]

Thanks for reporting!

1. The profile link you shared above does not open for me. Can you recheck the link?
2. Can you share detailed step-by-step steps on how to setup this Tampermonkey script and use it? (include the script, if you change any pref, how to install Tampermonkey, etc.)
3. Please type "about:support" in your Firefox browser in Mac and copy-paste its contents here.

Comment 3

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

This bug was moved into the Performance component.

:i, could you make sure the following information is on this bug?

• For slowness or high CPU usage, capture a profile with http://profiler.firefox.com/, upload it and share the link here.
• For memory usage issues, capture a memory dump from about:memory and attach it to this bug.
• Troubleshooting information: Go to about:support, click "Copy raw data to clipboard", paste it into a file, save it, and attach the file here.

If the requested information is already in the bug, please confirm it is recent.

Thank you.

Comment 4

[Guo Yunhe]

Here is the profiler report public link https://share.firefox.dev/4fXQLKx

Will share a reproduce script later

Comment 5

[Mayank Bansal]

(In reply to Guo Yunhe from comment #4)

Here is the profiler report public link https://share.firefox.dev/4fXQLKx

This profile is empty.

Comment 6

[Guo Yunhe]

OK, I don't know why Firefox cannot capture a valid profile. Beyond my knowledge.

Here are reproduce steps:

1. Install Firefox for macOS (arm)
2. Install Tampermonkey extension
3. Install this Tampermonkey script https://gist.github.com/guoyunhe/60932677edeba139c0c0c245dc435fb8
4. Go to https://www.goofish.com/
5. Click the big red button in the middle of page
6. Allow page to popup new window/tabs
7. Watch about:processes for cpu and memory usage

Comment 7

[Guo Yunhe]

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Comment 8

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

The severity field is not set for this bug.
:jlink, could you have a look please?

For more information, please visit BugBot documentation.

Comment 9

[Justin Link]

Guo Yunhe: Are you still seeing this problem? If you are, can you try doing the following things the next time you see it?

1. Navigate to about:memory and click "Measure and Save" and upload the report here (by attaching it to this bug).
2. While still at about:memory, click "Minimize Memory Usage". Re-observe the reported memory usage. If the numbers have gone down dramatically, then it would appear that GC/CC are working correctly and that nothing is truly being leaked, or lost track of, and the problem is probably related to GC/CC not getting scheduled in the workload that you have created.
3. If reported memory usage does not drop down to "normal" levels, capture and upload another memory report (as in step 1).

Comment 10

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

Redirect a needinfo that is pending on an inactive user to the triage owner.
:jlink, since the bug has recent activity, could you please find another way to get the information or close the bug as INCOMPLETE if it is not actionable?

For more information, please visit BugBot documentation.