On 3/21/2014 2:46 AM, Nicholas Nethercote wrote:
Hi,
At start-up, with a new profile, Firefox creates more than 230 system
compartments. This is about 90 more than a year ago, and it's part of
the reason why Firefox uses almost twice as much physical memory at
start-up than it did two years ago. (Have a look at
https://areweslimyet.com/ for the measurements.)
What is the per-compartment overhead?
It seems like we have two possible solutions in general:
* stop doing so much at startup/make sure feature code is only loaded
when the feature is used
* combine things that are currently in multiple compartments together
into one compartment. Perhaps some manual combination of .jsms into a
smaller number of compartments similar to what B2G does?
I recently filed bug 982623 which might be able to help somewhat.
Currently many frontend features are primarily written as a .jsm, but
have a separate XPCOM component so that they can register for
startup/profile/update-timer notifications. With that patch we should at
least be able to get rid of the separate XPCOM component and only use
the .jsm.
I suspect that you'll have more luck if you direct questions or
recommendations to specific module owners/teams based on this list.
--BDS
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