498041 - Microsummaries do a bunch of work every 15 seconds

Status: RESOLVED DUPLICATE of bug 492794

(Firefox Graveyard :: Microsummaries, defect)

Description

[Boris Zbarsky [:bzbarsky]]

A number of "real web page" profiles I've done recently seem to show the microsummary service taking up somewhere on the order of 10-15% of the time.

I looked at it, and it looks like every 15s we run MSS__updateMicrosummaries, which _should_ be fast because I don't have any microsummaries that I know of... and just isn't.  Is it hitting disk for every call or something?

Comment 1

[Shawn Wilsher :sdwilsh]

Could we see this profile please?  Also, have you changed any microsummary preferences?

Comment 2

[Boris Zbarsky [:bzbarsky]]

I'll send you the next profile I see this in (they're too big to attach to bugzilla)...

And no, I don't think I have.  Certainly not in the testing profile I do the profiling in.

Comment 3

[Myk Melez [:myk] [@mykmelez]]

Could this be a regression from bug 492794?

Comment 4

[Boris Zbarsky [:bzbarsky]]

The build I was using predates bug 492794 landing on m-c (pull from two days ago, in fact).  And that patch looks like it might well fix the issue I was seeing!  I'll update and see whether I hit anything like this again.  If I do, I'll reopen.