656339 - Need a project branch to find a regression range for bug 655930

Status: RESOLVED WONTFIX

(Release Engineering :: General, defect)

Description

[Shawn Wilsher :sdwilsh]

We need a project branch to find a regression range for the big performance regression on Windows being tracked in bug 655930.  The good (?) news is that we only need Windows boxes here, no unit tests, no debug builds, and only the Txul/Twinopen talos test running.

This repo should be initialized with this changeset (yes, it's very old):
https://hg.mozilla.org/mozilla-central/rev/5798118100e1

I can be considered the point of contact/owner for this.

Comment 1

[Timothy Nikkel (:tnikkel)]

Don't we want Tp4?

Comment 2

[Chris AtLee [:catlee]]

Can you use one of the disposable branches, and we can disable all the other platforms/tests?

Comment 3

[Chris AtLee [:catlee]]

(In reply to comment #2)
> Can you use one of the disposable branches, and we can disable all the other
> platforms/tests?

Or use try syntax?

Comment 4

[Shawn Wilsher :sdwilsh]

(In reply to comment #1)
> Don't we want Tp4?
Yes, I totally misstated that.  The latest tp test is fine (don't need tp4 specifically since this started to show up when tp5 was deployed [I think]).

(In reply to comment #2)
> Can you use one of the disposable branches, and we can disable all the other
> platforms/tests?
Yes, but I don't know how long of a line there is for those.  This is a pretty bad regression that we should get to the bottom of stat.

(In reply to comment #3)
> Or use try syntax?
Try doesn't let us push existing changesets to get new builds, right?  Or do you mean to say that try syntax works on the trees too?

Comment 5

[Jonathan Kew [:jfkthame]]

(In reply to comment #4)
> (In reply to comment #3)
> > Or use try syntax?
> Try doesn't let us push existing changesets to get new builds, right?

Doesn't it work to just push to try with an empty changeset on top of whatever existing changeset you want to build?

Comment 6

[Timothy Nikkel (:tnikkel)]

(In reply to comment #5)
> (In reply to comment #4)
> > (In reply to comment #3)
> > > Or use try syntax?
> > Try doesn't let us push existing changesets to get new builds, right?
> 
> Doesn't it work to just push to try with an empty changeset on top of
> whatever existing changeset you want to build?

Yes, I've done this before.

Comment 7

[Shawn Wilsher :sdwilsh]

(In reply to comment #5)
> Doesn't it work to just push to try with an empty changeset on top of whatever
> existing changeset you want to build?
I guess that would work too; hadn't thought of that actually!  That might be nicer then too because then we have a set of changesets which give us all new data for each change we push so we can graph this...

Comment 8

[Shawn Wilsher :sdwilsh]

I guess we don't need this after all.  I will proceed with the try server approach.

Comment 9

[Nick Thomas [:nthomas] (UTC+12)]

FWIW, Lukas added 3 more disposable branches recently to bring us up to 6 in total. Currently 3 free,
 https://wiki.mozilla.org/DisposableProjectBranches#BOOKING_SCHEDULE