29354462321
93%

Ran 14 Jul 2026 05:55PM UTC

Jobs 11

Files 1771

Run time 5min

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Committed 14 Jul 2026 05:36PM UTC coverage: 92.974% (-0.002%) from 92.976%

Build # 29354462321

Build Type

push

github

Committed by

web-flow

Commit Message

use a dedicated render thread for indicatif spinner (#23279)

Previously we had the classic combination of doing "real work" and
trying to keep a UI snappy on the same (scheduler) thread. This results
in jittery spinners that can be sluggish under load.

This change splits it out so there is a dedicated render thread. This
matches the architecture used by the `experimental-prodash` renderer.
The "obvious" alternative to get a steady tick would be
`enable_steady_tick`, but that was rejected in #19931 due to desync
concerns.

Using the large repo from #23236

```
$ asciinema record data/baseline.cast --command  '_PANTS_VERSION_OVERRIDE=2.31.0 PANTS_DEBUG= /home/ecsb/src/o/pants-trees/baseline/pants --no-pantsd --changed-since=HEAD~1 --changed-dependents=transitive list'
```

baseline: https://asciinema.org/a/b67xISILRXqBQl4U

after: https://asciinema.org/a/DK0s3SB6ISjab6ji

Notice: I used a LLM to try a variety of approaches to reduce jitter and
to write the code for this particular restructuring. It is both the most
clearly helpful, and a building block for anything else. I also used a
LLM to write a script to analyze asciinema logs, but in this case the
visual outcome was obvious.

Coverage Stats

94605 of 101754 relevant lines covered (92.97%)

3.68 hits per line

Coverage Regressions

Lines	Coverage	∆	File
1	96.15	-3.85%	src/python/pants/backend/tools/preamble/subsystem.py
1	92.64	-0.16%	src/python/pants/engine/internals/graph.py

Jobs

ID	Job ID	Ran	Files	Coverage
1	test_python_linux_arm64 - 29354462321.1	14 Jul 2026 05:55PM UTC	1190	51.76	GitHub Action Run
2	test_python_linux_x86_64_7/10 - 29354462321.2	14 Jul 2026 06:01PM UTC	1212	50.84	GitHub Action Run
3	test_python_linux_x86_64_1/10 - 29354462321.3	14 Jul 2026 06:01PM UTC	1210	48.93	GitHub Action Run
4	test_python_linux_x86_64_2/10 - 29354462321.4	14 Jul 2026 05:58PM UTC	1211	58.65	GitHub Action Run
5	test_python_linux_x86_64_0/10 - 29354462321.5	14 Jul 2026 06:02PM UTC	1231	57.38	GitHub Action Run
6	test_python_linux_x86_64_8/10 - 29354462321.6	14 Jul 2026 06:00PM UTC	1210	52.87	GitHub Action Run
7	test_python_linux_x86_64_9/10 - 29354462321.7	14 Jul 2026 06:00PM UTC	1221	53.93	GitHub Action Run
8	test_python_linux_x86_64_4/10 - 29354462321.8	14 Jul 2026 06:05PM UTC	1241	59.0	GitHub Action Run
9	test_python_linux_x86_64_3/10 - 29354462321.9	14 Jul 2026 06:02PM UTC	1209	52.37	GitHub Action Run
10	test_python_linux_x86_64_6/10 - 29354462321.10	14 Jul 2026 05:58PM UTC	1206	49.71	GitHub Action Run
11	test_python_linux_x86_64_5/10 - 29354462321.11	14 Jul 2026 05:59PM UTC	1224	59.94	GitHub Action Run

pantsbuild / pants / 29354462321
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