1604766 - 0.27 - 0.31% Base Content JS (linux64, macosx1014-64-shippable, windows10-64) regression on push d50c6bc9b76ec316b2cd09215e6abc4715e3478a (Mon December 16 2019)

Status: RESOLVED WONTFIX

(Core :: JavaScript Engine, defect)

Description

[Marian Raiciof [:marauder]]

0.27 - 0.31% Base Content JS (linux64, linux64-qr, linux64-shippable, linux64-shippable-qr, macosx1014-64-shippable, windows10-64, windows10-64-qr, windows10-64-shippable, windows10-64-shippable-qr) regression on push d50c6bc9b76ec316b2cd09215e6abc4715e3478a (Mon December 16 2019)

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We have detected an awsy regression from push:

https://hg.mozilla.org/integration/autoland/pushloghtml?changeset=d50c6bc9b76ec316b2cd09215e6abc4715e3478a

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

Regressions:

0.31% Base Content JS linux64-shippable opt 3,834,948.00 -> 3,846,672.00
0.30% Base Content JS linux64 opt 3,835,130.67 -> 3,846,577.33
0.30% Base Content JS linux64-qr opt 3,835,138.67 -> 3,846,688.00
0.30% Base Content JS linux64-shippable-qr opt 3,835,249.33 -> 3,846,722.67
0.30% Base Content JS macosx1014-64-shippable opt 3,836,302.67 -> 3,847,730.67
0.30% Base Content JS windows10-64 opt 3,893,918.67 -> 3,905,506.67
0.30% Base Content JS windows10-64-qr opt 3,893,892.00 -> 3,905,524.00
0.30% Base Content JS windows10-64-shippable opt 3,893,820.00 -> 3,905,421.33
0.30% Base Content JS windows10-64-shippable-qr opt 3,893,900.00 -> 3,905,528.00
0.27% Base Content JS linux64-shippable opt 3,837,000.00 -> 3,847,240.00

You can find links to graphs and comparison views for each of the above tests at: https://treeherder.mozilla.org/perf.html#/alerts?id=24515

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://wiki.mozilla.org/AWSY/Tests

Comment 1

[Ted Campbell [:tcampbell]]

Thanks for the alert. This is an expected intermediate step until Bug 1529456 lands in next few weeks.

The additional field will remain in the final design, but as a result we can remove a field of the same size from more locations for a net win. There are also a few other wins that are unlocked by this approach.

Comment 2

[Marian Raiciof [:marauder]]

Thank you Ted, i'll mark the alert as won't fix.