1643800 - raptor-tp6-reddit-firefox load time on Linux is noisier and about 0-20% slower with Fission than non-Fission

Status: RESOLVED WORKSFORME

(Core :: DOM: Content Processes, defect, P3)

Description

[Chris Peterson [:cpeterson]]

Attachment: Screenshot_2020-06-05 Treeherder.png

Link to Perfherder results:

https://treeherder.mozilla.org/perf.html#/graphs?highlightAlerts=1&series=mozilla-central,1938717,1,10&series=mozilla-central,2237467,1,10&series=mozilla-central,1935121,1,10&series=mozilla-central,2237605,1,10&timerange=2592000

raptor-tp6-reddit-firefox load time on Windows doesn't seem to be any slower with Fission than non-Fission.

See the attached Perfherder screenshot for posterity.

Comment 1

[Tarek Ziadé (:tarek)]

Looking at the last 60 days, it looks like it was a temporary state (for the noise)

https://treeherder.mozilla.org/perf.html#/graphs?highlightAlerts=1&series=mozilla-central,1938717,1,10&series=mozilla-central,2237467,1,10&series=mozilla-central,1935121,1,10&series=mozilla-central,2237605,1,10&timerange=5184000

Comment 2

[Chris Peterson [:cpeterson]]

(In reply to Tarek Ziadé (:tarek) from comment #1)

Looking at the last 60 days, it looks like it was a temporary state (for the noise)

https://treeherder.mozilla.org/perf.html#/graphs?highlightAlerts=1&series=mozilla-central,1938717,1,10&series=mozilla-central,2237467,1,10&series=mozilla-central,1935121,1,10&series=mozilla-central,2237605,1,10&timerange=5184000

Hmm. I still see the noise problem in that graph. The problem isn't the temporary dip from April 30 to May 9. It's that the "raptor-tp6-reddit-firefox loadtime opt fission" results (the cyan boxes in the screenshot in comment 0) are slower and noisier than the "raptor-tp6-reddit-firefox loadtime opt" results on Linux:

https://treeherder.mozilla.org/perf.html#/graphs?highlightAlerts=1&series=mozilla-central,1938717,1,10&series=mozilla-central,2237467,1,10&timerange=2592000

The "raptor-tp6-reddit-firefox loadtime opt" results are between 1400 - 1550 ms.

The "raptor-tp6-reddit-firefox loadtime opt fission" results are between 1400 - 1830 ms.

Comment 3

[Chris Peterson [:cpeterson]]

Closing as WFM because Reddit cold load time now appears to be about 4% faster with Fission than without:

https://treeherder.mozilla.org/perf.html#/graphs?highlightAlerts=1&series=mozilla-central,2135958,1,10&series=mozilla-central,2535382,1,10&series=mozilla-central,2565604,1,10&timerange=2592000