WIP: add codspeed benchmarks [skip cirrus]

[ev-br]

cross-ref ev-br/openblas-bench#6

[ev-br]

Phew. Finally managed to make it run on codspeed. Will clean up the codspeed action and revert back the other CI.

However, https://github.com/OpenMathLib/OpenBLAS/actions/runs/9138697348/job/25130179181?pr=4678 reports that

Upload the results
  CodSpeed Run Hash: "47ae471c56db8c1163d892307489c4ea202671cd8d4197ca08586f9ab23bddfd"
  Preparing upload...
  Error: Error Failed to retrieve upload data: 401 Unauthorized {"error":"The repository is not enabled"}
  Error: Process completed with exit code 1.

WDYT @martin-frbg ?

[martin-frbg]

Idk, this repository has never worn a codpiece before. Their site has now asked me to enable the repo and add a codspeed_token (which I don`t think it did before) so maybe it will work now

[codspeed-hq]

CodSpeed Performance Report

Congrats! CodSpeed is installed 🎉

🆕 16 new benchmarks were detected.

You will start to see performance impacts in the reports once the benchmarks are run from your default branch.

Detected benchmarks

• test_daxpy[1000] (48.9 µs)
• test_daxpy[100] (41.6 µs)
• test_dot[1000] (43.4 µs)
• test_dot[100] (36.9 µs)
• test_gemm[1000] (1.1 s)
• test_gemm[100] (1.7 ms)
• test_gesdd[mn0] (349.8 µs)
• test_gesdd[mn1] (451.7 ms)
• test_gesv[1000] (454.4 ms)
• test_gesv[100] (1.8 ms)
• test_nrm2[1000] (53.8 µs)
• test_nrm2[100] (56.4 µs)
• test_syev[200] (333.8 ms)
• test_syev[50] (8 ms)
• test_syrk[1000] (642.6 ms)
• test_syrk[100] (1.1 ms)

[ev-br]

Yup, it did work this time: https://codspeed.io/OpenMathLib/OpenBLAS/branches/ev-br:codspeed !
The PR is ready from my side.