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greenbench: an energy study of three sorts in C, Python and Node.js (time measured, energy pending a bare-metal run) - #2

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fasharif merged 51 commits into

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feature/greenbench

Oct 2, 2026

Commits on Sep 25, 2026
- chore: treat images as binary and ignore build and run output
  
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- refactor: move the sorts and the input generator into src/
  
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- feat: read RAPL energy from powercap, with wraparound and clear failures
  
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- feat: add the C worker and the one-line result protocol
  
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- feat: add the measurement harness
  
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- feat: add the Python worker and the Python tooling
  
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- feat: add the Node.js worker
  
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- test: check cross-language parity and the harness end to end
  
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- feat: add grid carbon intensity for the UAE and the UK
  
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- feat: add the statistics and report package
  
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- feat: run the whole study on bare-metal Linux with one command
  
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- ci: test every part of the study on every push
  
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- chore: mark the study script and the workers executable
  
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- fix: keep coinciding lines and unplottable values visible in the charts
  
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- feat: retry a worker process that fails, once by default
  
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- chore: show timings in the local smoke report
  
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  9839cba
- docs: rewrite the README for greenbench and document the study
  
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  982ec1c
- fix: make the report's provenance lines easier to read and reproduce
  
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- docs: generate results.md from a study-profile run, with timings pending
  
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- fix: refuse RAPL counters that never move instead of recording zeros
  
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Commits on Sep 26, 2026
- fix: measure startup cost over a batch of launches, not one short process
  
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- fix: pin to two CPUs on different cores so Node.js helper threads can run
  
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  0c681e9
- fix: record a command that pastes back into a shell, and keep inputs valid
  
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  1868fab
- feat: record CPU and memory limits and short sort loops in meta.json
  
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  004f350
- fix: give the Node.js sorts a packed array, as C and Python get
  
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  4ca24d3
- feat: answer the proxy question with power and ratios, not pooled rho
  
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- test: run moving, wrapping counters through the harness into the report
  
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- fix: make the study script's checks catch what they claim to
  
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- fix: pin the Docker base images by digest so Dependabot can update them
  
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- docs: cite the grid intensity data the way Our World in Data asks
  
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- docs: describe the study as it now measures and decides
  
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- docs: give the statistics feature a plain name
  
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- docs: regenerate results.md with harness 2.1, timings still pending
  
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- fix: judge each socket's counter on its own, and refuse implausible jumps
  
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Commits on Sep 27, 2026
- test: simulate RAPL readings from the clock so energy tests cannot flake
  
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- feat: give rank agreement for each language and algorithm
  
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- feat: read each power ratio against a margin set before measuring
  
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- fix: aim calibration 20% above the minimum loop length
  
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- fix: refuse --cpus when the kernel leaves out a listed CPU
  
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- feat: generate the README's results block with the report
  
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- fix: keep the study off CPU 0's sibling thread and efficiency cores
  
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- fix: block suspend while the study measures
  
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- build: add make setup, so the quick start is five commands
  
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- ci: add job timeouts, test the Node.js worker on 18 and 20, drop a repeat
  
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- docs: keep the README and study notes true before and after the study
  
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- docs: drop an unmeasured claim about language speed, and rewrap
  
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- docs: regenerate results.md with harness 2.2.0, timings still pending
  
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Commits on Oct 2, 2026
- feat: report time and time ratios from a run without energy
  
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- feat: measure time for the study profile in Docker, with energy off
  
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- docs: publish time results measured in Docker, with energy pending
  
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- docs: explain why the C bubble sort is slower than Node.js
  
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Commits

Commits on Sep 25, 2026

Commits on Sep 26, 2026

Commits on Sep 27, 2026

Commits on Oct 2, 2026