1397622 - 2.25 - 3.16% JS (windows10-64) regression on push 55e08f65ac23b380ca995319032f07121d46bf71 (Mon Sep 4 2017)

Status: RESOLVED DUPLICATE of bug 1397314

(Core :: JavaScript: GC, defect)

Description

[Ionuț Goldan [:igoldan]]

We have detected an awsy regression from push:

https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?changeset=55e08f65ac23b380ca995319032f07121d46bf71

As author of one of the patches included in that push, we need your help to address this regression.

Regressions:

  3%  JS summary windows10-64 pgo      123,164,055.50 -> 127,051,493.46
  2%  JS summary windows10-64 opt      123,982,386.48 -> 126,769,852.04


You can find links to graphs and comparison views for each of the above tests at: https://treeherder.mozilla.org/perf.html#/alerts?id=9266

On the page above you can see an alert for each affected platform as well as a link to a graph showing the history of scores for this test. There is also a link to a treeherder page showing the jobs in a pushlog format.

To learn more about the regressing test(s), please see: https://developer.mozilla.org/en-US/docs/Mozilla/Performance/AWSY

Comment 1

[Ionuț Goldan [:igoldan]]

Paul, these are the AWSY regressions we observed, alongside the Talos one, mentioned in bug 1397314.

Comment 2

[Paul Bone [:pbone]]

I'm working on this already, same comment as bug 1397314

It's plausable that my change created this regression.

My change can affect the tuning of the JavaScript GC Nursery size which will affect this metric. I'll do some testing and see if I can create a better policy/heuristic for setting the nursery size.

Comment 3

[Paul Bone [:pbone]]

This was resolved with the fix to Bug 1397314

Comment 4

[Ethan Tseng [:ethan]]

Mirror the status of bug 1397314.