730177 - Page doing a bunch of XHR and image loading seems to never trigger GC/CC

Status: RESOLVED INACTIVE

(Core :: JavaScript Engine, defect)

Description

[Boris Zbarsky [:bzbarsky]]

STEPS TO REPRODUCE:

1)  Load http://material.ly/products/547
2)  Hold down the right arrow key for a bit.  Or just hit that key every so often.

ACTUAL RESULTS:  As the page loads images, memory usage continues to climb, getting up over a gigabyte for me pretty easily.  Opening about:memory and telling it to minimize memory usage releases all the memory.

EXPECTED RESULTS: GC or CC should happen sometime...

Comment 1

[Boris Zbarsky [:bzbarsky]]

Also, if there is any way to work around this in the page, the page author would love to know in http://stackoverflow.com/questions/9366825/firefox-specific-memory-increases-in-heavy-ajax-app

Comment 2

[Andrew McCreight [:mccr8]]

Olli jiggered with how XHR stuff interacts with the CC in the last week, but I assume some random person on the internet probably isn't running Nightly.

Justin, does this sound like an image-suck bug?  The scenario here sounds vaguely like bug 679775.

I can look into how GC/CC scheduling is working (or otherwise) on this page if it isn't just badness about the way images are being handled.

Comment 3

[Andrew McCreight [:mccr8]]

Kyle might also have some idea.

Comment 4

[Kyle Huey (Exited; not receiving bugmail, old account, do not use)]

Sounds an awful lot like Bug 681479 to me.

Comment 5

[Justin Lebar (not reading bugmail)]

> ACTUAL RESULTS:  As the page loads images, memory usage continues to climb, getting up 
> over a gigabyte for me pretty easily.

bz, were you seeing uncompressed image memory usage, or just compressed?  If you ask about:memory just to GC/CC (not minimize memory usage), does it release all compressed in addition to uncompressed?

(Minimize memory usage should release all background uncompressed images unconditionally.)

I tried reproducing myself, but my internet connection here is way too slow.

Comment 6

[Olli Pettay [:smaug][[e-mail]]]

(In reply to Andrew McCreight [:mccr8] from comment #2)
> Olli jiggered with how XHR stuff interacts with the CC in the last week, but
> I assume some random person on the internet probably isn't running Nightly.
That affects only certainly alive XHRs.

And yes, this sounds like Bug 681479.

Comment 7

[Boris Zbarsky [:bzbarsky]]

> bz, were you seeing uncompressed image memory usage, or just compressed?

Mostly uncompressed.

gc/cc releases some of the uncompressed memory, but not all.

And now I can't seem to get this to go above 600MB or so...  :(

Comment 8

[Justin Lebar (not reading bugmail)]

If some but not all the uncompressed memory is released on gc/cc, then this sounds like a combination of bug 681479 and bug 679775.