Experiments on Joulie

CPU-Only Benchmark

Mon, 01 Jan 0001 00:00:00 +0000

This page reports results from the CPU-only cluster benchmark experiment (KWOK, 40 nodes):

experiments/01-cpu-only-benchmark/

Note (2026-10-09): The results on this page, like the experiment’s REPORT.md and REPORT-standalone.md, were produced with an older simulator model and have not been rerun. The simulator reads the hardware catalog embedded in it, with a SPECpower curve for each CPU that has one, and thermal throttling is off unless configured. Simulator changes lists each change and how far it moves the experiment’s configs/benchmark-debug.yaml.

Governor Exploration

Mon, 01 Jan 0001 00:00:00 +0000

This page reports experiment 05, CPU and GPU governor presets as an energy dimension of their own, next to power caps:

experiments/05-governor-exploration/

Joulie writes a governor as a vendor-neutral preset in the NodeTwin (spec.cpu.governor.preset: performance, balanced, efficiency; spec.gpu.governor.preset: auto, sustained, efficient, low, peak), and the agent maps it to the native words of the node’s CPU frequency driver and GPU family. Governor control is off by default (GOVERNOR_CONTROL, GOVERNOR_WRITES, Configuration reference).

Heterogeneous GPU Cluster Benchmark

Mon, 01 Jan 0001 00:00:00 +0000

This page reports results from the heterogeneous GPU cluster benchmark experiment (KWOK, 41 nodes):

experiments/02-heterogeneous-benchmark/

Note (2026-10-09): The results on this page, like the experiment’s REPORT.md and REPORT-standalone.md, were produced with an older simulator model and have not been rerun. The simulator reads the hardware catalog embedded in it, with a SPECpower curve for each CPU that has one, and thermal throttling is off unless configured. Simulator changes lists each change and how far it moves the experiment’s configs/benchmark-debug.yaml.

Homogeneous H100 NVL Benchmark

Mon, 01 Jan 0001 00:00:00 +0000

This page reports results from the homogeneous H100 NVL cluster benchmark experiment (KWOK, 41 nodes):

experiments/03-homogeneous-h100-benchmark/

Note (2026-10-09): The results on this page, like the experiment’s REPORT.md and REPORT-standalone.md, were produced with an older simulator model and have not been rerun. The simulator reads the hardware catalog embedded in it, with a SPECpower curve for each CPU that has one, and thermal throttling is off unless configured. Simulator changes lists each change and how far it moves the experiment’s configs/benchmark-debug.yaml.

Scoring Formula Validation

Mon, 01 Jan 0001 00:00:00 +0000

This page reports results from the energy-aware scheduling formula validation experiment:

experiments/04-scoring-formula-validation/

Objective

Validate Joulie’s energy-aware scheduling formula by demonstrating that power-aware scheduling improves energy efficiency compared to standard Kubernetes bin-packing (MostAllocated), using a Modelica FMU (DXCooled Airside Economizer) for physically-accurate cooling/PUE computation.

Two scales tested:

Small cluster (28 nodes): formula tuning and component selection
Large cluster (2,500 nodes): production-scale validation with H100 GPUs

The experiment also validated the evolution from a legacy multi-component formula to the current streamlined Joulie scoring formula.