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GeezerVison is showing github.com — test: fix flaky test-performance-eventloopdelay by mcollina · Pull Request #61629 · nodejs/node

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@mcollina

@mcollina mcollina commented Feb 1, 2026

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Summary

  • Fixes flaky test test/sequential/test-performance-eventloopdelay.js
  • The test was failing intermittently on IBM sharedlibs containers

Problem

The test was flaky because the histogram sampling might not have completed
before the assertions ran. The assertion assert(histogram.min > 0) could
fail if no samples were recorded yet.

Solution

  • Wrapped the assertions in setImmediate(common.mustCall(() => {...})) to
    give the event loop a chance to record final samples before checking
  • Added an explicit check for histogram.count > 0 to provide a clearer
    error message if no samples are recorded

Verification

Verified with python3 tools/test.py --repeat 50 without failures.

Refs: nodejs/reliability#1450

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@mcollina
test: fix flaky test-performance-eventloopdelay
25ea05c
The test was flaky because the histogram sampling might not have
completed before the assertions ran. By using setImmediate before
disabling the histogram and checking values, we give the event loop
a chance to record final samples on slower systems.

Also added an explicit check for histogram.count > 0 to provide a
clearer error message if no samples are recorded.

Refs: nodejs/reliability#1450
@nodejs-github-bot nodejs-github-bot added needs-ci PRs that need a full CI run. test Issues and PRs related to Node.js core tests and test infrastructure. labels Feb 1, 2026
@codecov

codecov Bot commented Feb 1, 2026 •
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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.74%. Comparing base (27a7bbc) to head (25ea05c).
⚠️ Report is 36 commits behind head on main.

Additional details and impacted files
@@            Coverage Diff             @@
##             main   #61629      +/-   ##
==========================================
- Coverage   89.76%   89.74%   -0.02%     
==========================================
  Files         673      673              
  Lines      203945   203945              
  Branches    39191    39194       +3     
==========================================
- Hits       183076   183040      -36     
- Misses      13198    13233      +35     
- Partials     7671     7672       +1     

see 38 files with indirect coverage changes

🚀 New features to boost your workflow:
  • ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
  • 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.
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legendecas
legendecas approved these changes Feb 3, 2026
View reviewed changes
@legendecas legendecas added the request-ci Add this label to start a Jenkins CI on a PR. Only starts once the PR has an approving review. label Feb 3, 2026
@github-actions github-actions Bot removed the request-ci Add this label to start a Jenkins CI on a PR. Only starts once the PR has an approving review. label Feb 3, 2026
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CI: https://ci.nodejs.org/job/node-test-pull-request/71179/

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@mcollina mcollina added author ready PRs with CI started, the required approvals, and no outstanding review comments. and removed needs-ci PRs that need a full CI run. labels Feb 4, 2026
@mcollina
mcollina requested review from anonrig and jasnell February 4, 2026 13:51
anonrig
anonrig approved these changes Feb 4, 2026
View reviewed changes
@mcollina mcollina added the commit-queue PRs queued for automated landing through the Commit Queue. label Feb 5, 2026
@nodejs-github-bot nodejs-github-bot removed the commit-queue PRs queued for automated landing through the Commit Queue. label Feb 5, 2026
@nodejs-github-bot
nodejs-github-bot merged commit 87e8e8b into nodejs:main Feb 5, 2026
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Landed in 87e8e8b

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aduh95 pushed a commit that referenced this pull request Feb 8, 2026
@mcollina @aduh95
test: fix flaky test-performance-eventloopdelay
23d1ecf
The test was flaky because the histogram sampling might not have
completed before the assertions ran. By using setImmediate before
disabling the histogram and checking values, we give the event loop
a chance to record final samples on slower systems.

Also added an explicit check for histogram.count > 0 to provide a
clearer error message if no samples are recorded.

Refs: nodejs/reliability#1450
PR-URL: #61629
Reviewed-By: Chengzhong Wu <[email protected]>
Reviewed-By: Yagiz Nizipli <[email protected]>
@github-actions github-actions Bot mentioned this pull request Feb 8, 2026
2026-02-10, Version 25.6.1 (Current) #61739
Merged
aduh95 pushed a commit that referenced this pull request Feb 10, 2026
@mcollina @aduh95
test: fix flaky test-performance-eventloopdelay
43cc4c5
The test was flaky because the histogram sampling might not have
completed before the assertions ran. By using setImmediate before
disabling the histogram and checking values, we give the event loop
a chance to record final samples on slower systems.

Also added an explicit check for histogram.count > 0 to provide a
clearer error message if no samples are recorded.

Refs: nodejs/reliability#1450
PR-URL: #61629
Reviewed-By: Chengzhong Wu <[email protected]>
Reviewed-By: Yagiz Nizipli <[email protected]>
tmeijn pushed a commit to tmeijn/dotfiles that referenced this pull request Feb 11, 2026
ECG Bot
build(deps): update node to v25.6.1
9e12cb1
This MR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [node](https://nodejs.org) ([source](https://github.com/nodejs/node)) | patch | `25.6.0` → `25.6.1` |

MR created with the help of [el-capitano/tools/renovate-bot](https://gitlab.com/el-capitano/tools/renovate-bot).

**Proposed changes to behavior should be submitted there as MRs.**

---

### Release Notes

<details>
<summary>nodejs/node (node)</summary>

### [`v25.6.1`](https://github.com/nodejs/node/releases/tag/v25.6.1): 2026-02-10, Version 25.6.1 (Current), @&#8203;aduh95

[Compare Source](nodejs/node@v25.6.0...v25.6.1)

##### Notable Changes

- \[[`47df4328d7`](nodejs/node@47df4328d7)] - **build,deps**: replace `cjs-module-lexer` with `merve` (Yagiz Nizipli) [#&#8203;61456](nodejs/node#61456)

##### Commits

- \[[`47df4328d7`](nodejs/node@47df4328d7)] - **build,deps**: replace cjs-module-lexer with merve (Yagiz Nizipli) [#&#8203;61456](nodejs/node#61456)
- \[[`a727054503`](nodejs/node@a727054503)] - **deps**: upgrade npm to 11.9.0 (npm team) [#&#8203;61685](nodejs/node#61685)
- \[[`c78c49ed6b`](nodejs/node@c78c49ed6b)] - **deps**: update amaro to 1.1.7 (Node.js GitHub Bot) [#&#8203;61730](nodejs/node#61730)
- \[[`4790816d9b`](nodejs/node@4790816d9b)] - **deps**: update minimatch to 10.1.2 (Node.js GitHub Bot) [#&#8203;61732](nodejs/node#61732)
- \[[`8c71740e8a`](nodejs/node@8c71740e8a)] - **deps**: update undici to 7.21.0 (Node.js GitHub Bot) [#&#8203;61683](nodejs/node#61683)
- \[[`e559ef6ab1`](nodejs/node@e559ef6ab1)] - **deps**: update googletest to [`56efe39`](nodejs/node@56efe39) (Node.js GitHub Bot) [#&#8203;61605](nodejs/node#61605)
- \[[`300de2bb5a`](nodejs/node@300de2bb5a)] - **deps**: update amaro to 1.1.6 (Node.js GitHub Bot) [#&#8203;61603](nodejs/node#61603)
- \[[`e71e9505ef`](nodejs/node@e71e9505ef)] - **dns**: fix Windows SRV ECONNREFUSED by adjusting c-ares fallback detection (notvivek12) [#&#8203;61453](nodejs/node#61453)
- \[[`439b816bc7`](nodejs/node@439b816bc7)] - **doc**: clarify EventEmitter error handling in threat model (Matteo Collina) [#&#8203;61701](nodejs/node#61701)
- \[[`c1c6641f23`](nodejs/node@c1c6641f23)] - **doc**: mention default option for test runner env (Steven) [#&#8203;61659](nodejs/node#61659)
- \[[`41ec451f98`](nodejs/node@41ec451f98)] - **doc**: fix --inspect security warning section (Tim Perry) [#&#8203;61675](nodejs/node#61675)
- \[[`bb90ef2356`](nodejs/node@bb90ef2356)] - **doc**: document `url.format(urlString)` as deprecated under DEP0169 (René) [#&#8203;61644](nodejs/node#61644)
- \[[`513df82e6f`](nodejs/node@513df82e6f)] - **doc**: update to Visual Studio 2026 manual install (Mike McCready) [#&#8203;61655](nodejs/node#61655)
- \[[`9409d30736`](nodejs/node@9409d30736)] - **doc**: deprecation add more codemod (Augustin Mauroy) [#&#8203;61642](nodejs/node#61642)
- \[[`75a7a67151`](nodejs/node@75a7a67151)] - **doc**: fix grammatical error in README.md (ayj8201) [#&#8203;61653](nodejs/node#61653)
- \[[`821e59e884`](nodejs/node@821e59e884)] - **doc**: correct tools README Boxstarter link (Mike McCready) [#&#8203;61638](nodejs/node#61638)
- \[[`4998f539a0`](nodejs/node@4998f539a0)] - **doc**: update `server.dropMaxConnection` link (YuSheng Chen) [#&#8203;61584](nodejs/node#61584)
- \[[`9383ac4ab7`](nodejs/node@9383ac4ab7)] - **http**: implement slab allocation for HTTP header parsing (Mert Can Altin) [#&#8203;61375](nodejs/node#61375)
- \[[`e90eb1d561`](nodejs/node@e90eb1d561)] - **meta**: persist sccache daemon until end of build workflows (René) [#&#8203;61639](nodejs/node#61639)
- \[[`ade36ac367`](nodejs/node@ade36ac367)] - **meta**: bump github/codeql-action from 4.31.9 to 4.32.0 (dependabot\[bot]) [#&#8203;61622](nodejs/node#61622)
- \[[`26638bd67f`](nodejs/node@26638bd67f)] - **meta**: bump step-security/harden-runner from 2.14.0 to 2.14.1 (dependabot\[bot]) [#&#8203;61621](nodejs/node#61621)
- \[[`eaa9a96cb6`](nodejs/node@eaa9a96cb6)] - **meta**: bump actions/setup-python from 6.1.0 to 6.2.0 (dependabot\[bot]) [#&#8203;61627](nodejs/node#61627)
- \[[`fd98187828`](nodejs/node@fd98187828)] - **meta**: bump cachix/cachix-action (dependabot\[bot]) [#&#8203;61626](nodejs/node#61626)
- \[[`820c1d021c`](nodejs/node@820c1d021c)] - **meta**: bump actions/setup-node from 6.1.0 to 6.2.0 (dependabot\[bot]) [#&#8203;61625](nodejs/node#61625)
- \[[`72a4136bd5`](nodejs/node@72a4136bd5)] - **meta**: bump actions/cache from 5.0.1 to 5.0.3 (dependabot\[bot]) [#&#8203;61624](nodejs/node#61624)
- \[[`e3ef6cb3bc`](nodejs/node@e3ef6cb3bc)] - **meta**: bump peter-evans/create-pull-request from 8.0.0 to 8.1.0 (dependabot\[bot]) [#&#8203;61623](nodejs/node#61623)
- \[[`020a836202`](nodejs/node@020a836202)] - **meta**: bump actions/stale from 10.1.0 to 10.1.1 (dependabot\[bot]) [#&#8203;61620](nodejs/node#61620)
- \[[`0df72f07c8`](nodejs/node@0df72f07c8)] - **meta**: bump actions/checkout from 6.0.1 to 6.0.2 (dependabot\[bot]) [#&#8203;61619](nodejs/node#61619)
- \[[`d147c08b83`](nodejs/node@d147c08b83)] - **module**: do not invoke resolve hooks twice for imported cjs (Joyee Cheung) [#&#8203;61529](nodejs/node#61529)
- \[[`a2843f8556`](nodejs/node@a2843f8556)] - **net**: defer synchronous destroy calls in internalConnect (RajeshKumar11) [#&#8203;61658](nodejs/node#61658)
- \[[`7fb7030781`](nodejs/node@7fb7030781)] - **repl**: fix flaky test-repl-programmatic-history (Matteo Collina) [#&#8203;61614](nodejs/node#61614)
- \[[`d4c9b5cf5b`](nodejs/node@d4c9b5cf5b)] - **sqlite**: avoid extra copy for large text binds (Ali Hassan) [#&#8203;61580](nodejs/node#61580)
- \[[`aa1b3661d9`](nodejs/node@aa1b3661d9)] - **sqlite**: use DictionaryTemplate for run() result (Mert Can Altin) [#&#8203;61432](nodejs/node#61432)
- \[[`9c8ad7e881`](nodejs/node@9c8ad7e881)] - **src**: elide heap allocation in structured clone implementation (Anna Henningsen) [#&#8203;61703](nodejs/node#61703)
- \[[`c4ecfef93d`](nodejs/node@c4ecfef93d)] - **src**: use simdutf for one-byte string UTF-8 write in stringBytes (Mert Can Altin) [#&#8203;61696](nodejs/node#61696)
- \[[`28905b9734`](nodejs/node@28905b9734)] - **src**: consolidate C++ ReadFileSync/WriteFileSync utilities (Joyee Cheung) [#&#8203;61662](nodejs/node#61662)
- \[[`e90cec2f69`](nodejs/node@e90cec2f69)] - **test**: restraint version replacement pattern in snapshots (Chengzhong Wu) [#&#8203;61748](nodejs/node#61748)
- \[[`adce20c0a1`](nodejs/node@adce20c0a1)] - **test**: print stack immediately avoiding GC interleaving (Chengzhong Wu) [#&#8203;61699](nodejs/node#61699)
- \[[`7643bc8999`](nodejs/node@7643bc8999)] - **test**: fix case-insensitive path matching on Windows (Matteo Collina) [#&#8203;61682](nodejs/node#61682)
- \[[`23d1ecf66f`](nodejs/node@23d1ecf66f)] - **test**: fix flaky test-performance-eventloopdelay (Matteo Collina) [#&#8203;61629](nodejs/node#61629)
- \[[`99012a88ed`](nodejs/node@99012a88ed)] - **test**: remove duplicate wpt tests (Filip Skokan) [#&#8203;61617](nodejs/node#61617)
- \[[`a8b32b8ce1`](nodejs/node@a8b32b8ce1)] - **test**: fix race condition in watch mode tests (Matteo Collina) [#&#8203;61615](nodejs/node#61615)
- \[[`086a5a5a25`](nodejs/node@086a5a5a25)] - **test**: update WPT for url to [`e3c46fd`](nodejs/node@e3c46fdf55) (Node.js GitHub Bot) [#&#8203;61602](nodejs/node#61602)
- \[[`f0574fd419`](nodejs/node@f0574fd419)] - **test**: use the skipIfNoWatch() utility function (Luigi Pinca) [#&#8203;61531](nodejs/node#61531)
- \[[`b064ddc221`](nodejs/node@b064ddc221)] - **test**: unify assertSnapshot common patterns (Chengzhong Wu) [#&#8203;61590](nodejs/node#61590)
- \[[`17122e521b`](nodejs/node@17122e521b)] - **test\_runner**: fix test enqueue when test file has syntax error (Edy Silva) [#&#8203;61573](nodejs/node#61573)
- \[[`bad3f02dd9`](nodejs/node@bad3f02dd9)] - **tools**: enforce removal of `lts-watch-*` labels on release proposals (Antoine du Hamel) [#&#8203;61672](nodejs/node#61672)
- \[[`a8f33fd6bd`](nodejs/node@a8f33fd6bd)] - **tools**: use ubuntu-slim runner in meta GitHub Actions (Tierney Cyren) [#&#8203;61663](nodejs/node#61663)
- \[[`c843e447ca`](nodejs/node@c843e447ca)] - **tools**: test `--shared-merve` in `test-shared` workflow (Antoine du Hamel) [#&#8203;61649](nodejs/node#61649)
- \[[`2fedc03f96`](nodejs/node@2fedc03f96)] - **tools**: update OpenSSL to 3.5.5 in `test-shared` (Antoine du Hamel) [#&#8203;61551](nodejs/node#61551)
- \[[`1c1db94670`](nodejs/node@1c1db94670)] - **tools,win**: upgrade install additional tools to Visual Studio 2026 (Mike McCready) [#&#8203;61562](nodejs/node#61562)

</details>

---

### Configuration

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♻ **Rebasing**: Whenever MR is behind base branch, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this MR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this MR, check this box

---

This MR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0Mi45Ny4wIiwidXBkYXRlZEluVmVyIjoiNDIuOTcuMCIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOlsiUmVub3ZhdGUgQm90IiwiYXV0b21hdGlvbjpib3QtYXV0aG9yZWQiLCJkZXBlbmRlbmN5LXR5cGU6OnBhdGNoIl19-->
@mcollina mcollina mentioned this pull request Feb 12, 2026
test: add retry logic for eventloopdelay histogram sampling #61796
Closed
aduh95 pushed a commit that referenced this pull request Feb 14, 2026
@mcollina @aduh95
test: fix flaky test-performance-eventloopdelay
48a4304
The test was flaky because the histogram sampling might not have
completed before the assertions ran. By using setImmediate before
disabling the histogram and checking values, we give the event loop
a chance to record final samples on slower systems.

Also added an explicit check for histogram.count > 0 to provide a
clearer error message if no samples are recorded.

Refs: nodejs/reliability#1450
PR-URL: #61629
Reviewed-By: Chengzhong Wu <[email protected]>
Reviewed-By: Yagiz Nizipli <[email protected]>
@github-actions github-actions Bot mentioned this pull request Feb 22, 2026
2026-02-24, Version 24.14.0 'Krypton' (LTS) #61924
Merged
aduh95 pushed a commit that referenced this pull request Feb 22, 2026
@mcollina @aduh95
test: fix flaky test-performance-eventloopdelay
06513f5
The test was flaky because the histogram sampling might not have
completed before the assertions ran. By using setImmediate before
disabling the histogram and checking values, we give the event loop
a chance to record final samples on slower systems.

Also added an explicit check for histogram.count > 0 to provide a
clearer error message if no samples are recorded.

Refs: nodejs/reliability#1450
PR-URL: #61629
Reviewed-By: Chengzhong Wu <[email protected]>
Reviewed-By: Yagiz Nizipli <[email protected]>
marco-ippolito pushed a commit that referenced this pull request Mar 2, 2026
@mcollina @marco-ippolito
test: fix flaky test-performance-eventloopdelay
ac9114c
The test was flaky because the histogram sampling might not have
completed before the assertions ran. By using setImmediate before
disabling the histogram and checking values, we give the event loop
a chance to record final samples on slower systems.

Also added an explicit check for histogram.count > 0 to provide a
clearer error message if no samples are recorded.

Refs: nodejs/reliability#1450
PR-URL: #61629
Reviewed-By: Chengzhong Wu <[email protected]>
Reviewed-By: Yagiz Nizipli <[email protected]>
@marco-ippolito marco-ippolito mentioned this pull request Mar 3, 2026
2026-03-05, Version 20.20.1 'Iron' (LTS), @marco-ippolito #62088
Merged
marco-ippolito pushed a commit that referenced this pull request Mar 3, 2026
@mcollina @marco-ippolito
test: fix flaky test-performance-eventloopdelay
929f7dc
The test was flaky because the histogram sampling might not have
completed before the assertions ran. By using setImmediate before
disabling the histogram and checking values, we give the event loop
a chance to record final samples on slower systems.

Also added an explicit check for histogram.count > 0 to provide a
clearer error message if no samples are recorded.

Refs: nodejs/reliability#1450
PR-URL: #61629
Reviewed-By: Chengzhong Wu <[email protected]>
Reviewed-By: Yagiz Nizipli <[email protected]>
marco-ippolito pushed a commit that referenced this pull request Mar 4, 2026
@mcollina @marco-ippolito
test: fix flaky test-performance-eventloopdelay
368b221
The test was flaky because the histogram sampling might not have
completed before the assertions ran. By using setImmediate before
disabling the histogram and checking values, we give the event loop
a chance to record final samples on slower systems.

Also added an explicit check for histogram.count > 0 to provide a
clearer error message if no samples are recorded.

Refs: nodejs/reliability#1450
PR-URL: #61629
Reviewed-By: Chengzhong Wu <[email protected]>
Reviewed-By: Yagiz Nizipli <[email protected]>
@trivikr trivikr mentioned this pull request Jul 25, 2026
test: avoid timer race in event loop delay test #64728
Merged
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@anonrig anonrig anonrig approved these changes
@legendecas legendecas legendecas approved these changes
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