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# CUDA performance harness (perf)
Near-native performance measurement for the Open-IOV emulated vGPU. One
workload binary (`perf_workload.cu`, static CUDA runtime) runs on the host
(bare metal, the oracle) and in the guest (emulated vGPU); `perf.sh` captures
the matching host-side vgsp evidence and compares guest/host ratios.
```
perf.sh check # prerequisites only (no GPU/VM action)
perf.sh host # oracle runs -> results/<stamp>-host/
perf.sh guest # push + measured runs -> results/<stamp>-guest/
perf.sh all # host + guest + compare
perf.sh compare # ratio table from the newest results
```
The full matrix, methods, thresholds, calibration procedure and evidence
discipline are in [`PLAN-AND-HARNESS.md`](PLAN-AND-HARNESS.md). The r3
baseline (`elapsed_ms=189`) and exactly what it measured are documented there
in §1.
Recording: raw results stay under `results/` (gitignored); the durable copy
and the public summary go to the campaign evidence directory and
`docs/05-operations/05-performance-results.md`, with a dated delta appended to
`handoff-meta-plan.md` §2.
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