1991895 - Add FOG platform microbenchmarks

Status: RESOLVED FIXED

(Data Platform and Tools :: Glean: SDK, task, P2)

Description

[Jan-Erik Rediger [:janerik] (Away 2026-08-24 - 2026-08-28)]

In order to get numbers on the performance of Glean inside Firefox we will start by collecting perfstats metrics.
Where to add those is to be determined as part of the implementation.

The idea is to then write a FOG test, using the existing FOG mochitest setup, to exercise the Glean recording code path.

Some material:

• PerfStats docs
• Example dashboard from another perfstats metric (GC)
• After that we want to enable those metrics in the speedometer3 test as well. See this code as an example.

Comment 1

[Jan-Erik Rediger [:janerik] (Away 2026-08-24 - 2026-08-28)]

Attachment: Bug 1991895 - Add FOG platform microbenchmarks r?chutten!

This is the most minimal form of benchmarks we can add.
Right now the two benchmarks we have merely try to add to a (labeled)
counter in a loop.
The benchmarking framework will time this.

Whether that's sufficiently stable and we can actually use those
benchmarks to optimize will be seen once we have data.

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/0c172f2a4677
https://hg.mozilla.org/integration/autoland/rev/3cd861336ee3
Add FOG platform microbenchmarks r=chutten

Comment 3

[amarc]

https://hg.mozilla.org/mozilla-central/rev/3cd861336ee3

Comment 4

[Jan-Erik Rediger [:janerik] (Away 2026-08-24 - 2026-08-28)]

We drifted a bit from the initial plan.
We might bring back the speedometer3 idea still. For now I'll update this bug to better reflect what happened.