1159015 - Session restore profile takes time/memory to be saved to disk.

Status: RESOLVED WORKSFORME

(Firefox :: Session Restore, defect)

Description

[Clément Lefèvre]

Attachment: memory-report.tgz

MacOS freeze from time to time.  This might be related to the fact that the session restore tab takes ~100MB on its own.

A thing which does not appear in the anonymized profile is that the session restore string appears multiple times.

The reason of the freeze is caused by the fact that Firefox suddenly jump from 2GB to 10GB (until reboot / killing firefox), which cause the system to compress the RAM. Knowing that the biggest source of memory consumption is caused by the session restore tab, I presume that this might be related to the fact that the tabs are saved to the disk.

Is there a way to investigate this issue, knowing that I cannot spawn a new program to investigate this issue when the system is highly loaded, and that I have to kill firefox to keep a running system?

I noticed this issue since Firefox 36.  Is there, by chance, any modification which might be related?

Comment 1

[David Teller [:Yoric] - still alive but not very active]

Nicholas, how do you suggest investigating this?

Comment 2

[Nicholas Nethercote [inactive]]

Memory reports from about:memory is the obvious place to start.

Comment 3

[David Teller [:Yoric] - still alive but not very active]

So, I see 245Mb of strings in SessionWorker.js, but nothing about the session restore tab. Clément, am I missing something?

Comment 4

[David Teller [:Yoric] - still alive but not very active]

As a side-note, we apparently experience complete system freezes on MacOS X for graphics-related reasons. I just experienced one without any memory pressure involved.

Comment 5

[Clément Lefèvre]

So, closing as WFM for now: having lost my "recursive" session restore some times ago, I couldn't reproduce the problem anymore excepted maybe by recreating tons of tabs and crashed sessions.

Let's see if the situation comes again in the future.