764905 - Randomly flip preload on/off, independent of whether update service deleted prefetch

Status: RESOLVED FIXED

(Core :: General, defect)

Description

[(dormant account)]

Should add a new (binary?) histogram to indicate whether we decided to prefetch or not. I think 50% rand() is fine for this, unless there are other startup experiments we want to do at the same time.

Comment 1

[Mike Hommey [:glandium]]

I guess we want to avoid this spilling on some channels. Which channels would it be suitable for? aurora + nightly? only nightly?

Comment 2

[(dormant account)]

Aurora/nightly sounds good to me.

Comment 3

[Brian R. Bondy [:bbondy]]

Maybe we should try no prefetch + no preload?

Comment 4

[(dormant account)]

(In reply to Brian R. Bondy [:bbondy] from comment #3)
> Maybe we should try no prefetch + no preload?

Worth a try, but that requires being able to randomly remove prefetch files. Seems like something best done in own bug.

Comment 5

[Brian R. Bondy [:bbondy]]

Specifically I'd like to see if no prefetch + no preload is faster than no prefetch + preload.  So both have no prefetch.

Comment 6

[Brian R. Bondy [:bbondy]]

Attachment: Patch v1.

Comment 7

[(dormant account)]

Comment on attachment 633340 [details] [diff] [review]
Patch v1.

r+ if you change STARTUP_USING_PRELOAD to STARTUP_USING_PRELOAD_TRIAL or something. It's ok to reuse a histogram for a slightly different meaning, not ok to change histogram bucket distribution, it really confuses our frontend.

Comment 8

[Brian R. Bondy [:bbondy]]

Attachment: Patch v2

Made histogram name change.

Comment 9

[Brian R. Bondy [:bbondy]]

http://hg.mozilla.org/integration/mozilla-inbound/rev/6291213e96ee

Comment 10

[Ryan VanderMeulen [:RyanVM]]

https://hg.mozilla.org/mozilla-central/rev/6291213e96ee