[CI Energy Waste] Deduplicate static checks in CI workflow

[souhailaS]

Context

We conducted an analysis of the nodejs.yml workflow run history using GitHub API data from recent successful executions. The analysis revealed potential resource optimisation in setup steps across three static check jobs (typecheck, lint, yarn-validate), each performing identical dependency installation and environment setup.

Change

Combined three jobs into one static-checks job, eliminating redundant setup (installations and checkouts)

Impact

Based on the runs history this workflow. We could estimate:

• Estimated time saved per run: 48.3 seconds
• Setup overhead: 79s → 29s (63% reduction)
• Estimated Annual savings: 35 hours (~$17)

Technical

• All checks preserved
• Same failure detection
• No functionality loss

Files

• .github/workflows/nodejs.yml

Additional Context

We are a team of researchers from University of Zurich (https://www.ifi.uzh.ch/en/zest.html) currently working on automating energy optimizations in GitHub Actions workflows. This optimization maintains full functionality while potentially reducing computational overhead and energy consumption.

souhaila.serbout@uzh.ch

[linux-foundation-easycla]

• ✅login: souhailaS / (a6b2cc7)
• ✅login: souhailaS / (a6b2cc7, b18b377)

The committers listed above are authorized under a signed CLA.

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commit: b18b377

[mrazauskas]

• Estimated Annual savings: 35 hours (~$17)

Can I ask how does this compares with an average annual tuition fee at the University of Zurich? (That is irony, of course. But I think the question is legit, because you titled this PR with: "Energy Waste". Do you see the point?)

[souhailaS]

@mrazauskas , indeed ... the question is ''legit''.

You're absolutely right that $17 won’t fund a semester at the University of Zurich but could plant a dozen trees. And while that may still sound minor, it’s symbolic of something larger.

GitHub nowadays hosts about 420 million repositories. If each of them approximately were to waste just one second of runner time per day, that would amount to 7 million minutes wasted daily. At GitHub's billing rate of $0.008 per minute, this seemingly minor inefficiency would result in over $56 000 per day, or even more than $20 million annually, in excess compute costs.

But the story is not about the financial dimension .. it's the env footprint: 1 s per repo per day would translate to roughly 2100 kWh wasted daily (for the basic ubuntu-latest runner), or about 730 000 kWh annually, equivalent to the yearly consumption of dozens of households in a developed country.

[mrazauskas]

You are manipulating with numbers. That is it.

GitHub or any other responsible corporation should(!) and must(!) invest into education of upcoming developers. I am rather sure they do! (For instance, they do not take a penny from open source projects. These are in many case the learning projects, actually. What about the University of Zurich? Do they charge you for learning? Could you please calculate and provide the number of $ the University of Zurich is charging per day for everyone who, perhaps, wants to simply learn something new? Or everyone ate the university simply learning how to get more of $ per day / per hour / per whatever.)

That is not anyhow taken into account of your “research“. Really sorry about the question marks, but I still find it questionable. The numbers you provide are manipulative and not based on reality.

[cpojer]

@souhailaS Thank you

@mrazauskas please spend some time reflecting on your conduct

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