Bug: 4.12 - 2.15% Images Fresh start [+30s] / Images + 3 more (Linux, Windows) regression on Fri November 8 2024
Status: RESOLVED
Priority: --
Resolution: WONTFIX
Created: 2025-01-03 09:12:10+00:00
Resolved: 2025-01-03 22:31:15+00:00

Perfherder has detected a awsy performance regression from push [74d49a1535b4a51276e56112ff588a6a17782d9c](https://hg.mozilla.org/integration/autoland/pushloghtml?changeset=74d49a1535b4a51276e56112ff588a6a17782d9c). As author of one of the patches included in that push, we need your help to address this regression.

### Regressions:

| **Ratio** | **Test** | **Platform** | **Options** | **Absolute values (old vs new)** |  
|--|--|--|--|--| 
| [4%](https://treeherder.mozilla.org/perfherder/graphs?timerange=5184000&series=autoland,2549392,1,4)  | [Images](https://firefox-source-docs.mozilla.org/testing/perfdocs/awsy.html#images) Fresh start [+30s] | linux1804-64-shippable-qr | fission tp6 | 1,307,876.67 -> 1,361,744.00 | 
| [4%](https://treeherder.mozilla.org/perfherder/graphs?timerange=5184000&series=autoland,4663363,1,4)  | [Images](https://firefox-source-docs.mozilla.org/testing/perfdocs/awsy.html#images) Fresh start [+30s] | windows11-64-2009-shippable-qr | fission tp6 | 1,476,949.33 -> 1,529,728.00 | 
| [3%](https://treeherder.mozilla.org/perfherder/graphs?timerange=5184000&series=autoland,4663370,1,4)  | [Images](https://firefox-source-docs.mozilla.org/testing/perfdocs/awsy.html#images) Tabs closed [+30s, forced GC] | windows11-64-2009-shippable-qr | fission tp6 | 1,622,238.00 -> 1,676,561.33 | 
| [3%](https://treeherder.mozilla.org/perfherder/graphs?timerange=5184000&series=autoland,4663367,1,4)  | [Images](https://firefox-source-docs.mozilla.org/testing/perfdocs/awsy.html#images) Tabs closed extra processes | windows11-64-2009-shippable-qr | fission tp6 | 2,777,934.00 -> 2,855,304.00 | 
| [2%](https://treeherder.mozilla.org/perfherder/graphs?timerange=5184000&series=autoland,2549390,1,4)  | [Images](https://firefox-source-docs.mozilla.org/testing/perfdocs/awsy.html#images)  | linux1804-64-shippable-qr | fission tp6 | 5,170,001.72 -> 5,281,334.69 | 
### Improvements:

| **Ratio** | **Test** | **Platform** | **Options** | **Absolute values (old vs new)** |  
|--|--|--|--|--| 
| [0.49%](https://treeherder.mozilla.org/perfherder/graphs?timerange=5184000&series=autoland,4663361,1,4)  | [Images](https://firefox-source-docs.mozilla.org/testing/perfdocs/awsy.html#images)  | windows11-64-2009-shippable-qr | fission tp6 | 5,617,303.91 -> 5,589,875.12 | 


Details of the alert can be found in the [alert summary](https://treeherder.mozilla.org/perfherder/alerts?id=43211), including links to graphs and comparisons for each of the affected tests. Please follow our [guide to handling regression bugs](https://wiki.mozilla.org/TestEngineering/Performance/Handling_regression_bugs) and **let us know your plans within 3 business days, or the patch(es) may be backed out** in accordance with our [regression policy](https://www.mozilla.org/en-US/about/governance/policies/regressions/).

If you need the profiling jobs you can trigger them yourself from treeherder job view or ask a sheriff to do that for you.

You can run all of these tests on try with `./mach try perf --alert 43211`

The following [documentation link](https://firefox-source-docs.mozilla.org/testing/perfdocs/mach-try-perf.html#running-alert-tests) provides more information about this command.

For more information on performance sheriffing please see our [FAQ](https://wiki.mozilla.org/TestEngineering/Performance/FAQ).

If you have any questions, please do not hesitate to reach out to afinder@mozilla.com.