Generalize warp size in pixel clustering kernel

[AuroraPerego]

PR description:

In the FindClus kernel there was an assumption on the warp size being equal to 32, which is true for NVIDIA GPUs, but not always for AMD GPUs. Now the warp size is taken from the __AMDGCN_WAVEFRONT_SIZE macro for HIP and uses 32 for CUDA.

Note that alpaka::warp::getSize(acc) cannot be used because it's evaluated at runtime.

PR validation:

tested on wf 12834.402

[cmsbuild]

cms-bot internal usage

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-46426/42288

[cmsbuild]

A new Pull Request was created by @AuroraPerego for master.

It involves the following packages:

• RecoLocalTracker/SiPixelClusterizer (reconstruction)

@cmsbuild, @jfernan2, @mandrenguyen can you please review it and eventually sign? Thanks.
@GiacomoSguazzoni, @VinInn, @VourMa, @dkotlins, @felicepantaleo, @ferencek, @gpetruc, @missirol, @mmusich, @mroguljic, @mtosi, @rovere, @threus, @tsusa, @tvami this is something you requested to watch as well.
@antoniovilela, @mandrenguyen, @rappoccio, @sextonkennedy you are the release manager for this.

cms-bot commands are listed here

[fwyzard]

please test

[cmsbuild]

+1

Size: This PR adds an extra 20KB to repository
Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-738b8b/42276/summary.html
COMMIT: 486bfef
CMSSW: CMSSW_14_2_X_2024-10-17-1100/el8_amd64_gcc12
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week1/cms-sw/cmssw/46426/42276/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• You potentially removed 2 lines from the logs
• Reco comparison results: 12 differences found in the comparisons
• DQMHistoTests: Total files compared: 44
• DQMHistoTests: Total histograms compared: 3335129
• DQMHistoTests: Total failures: 354
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3334755
• DQMHistoTests: Total skipped: 20
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 43 files compared)
• Checked 193 log files, 163 edm output root files, 44 DQM output files
• TriggerResults: no differences found

[jfernan2]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next master IBs (tests are also fine). This pull request will now be reviewed by the release team before it's merged. @mandrenguyen, @rappoccio, @antoniovilela, @sextonkennedy (and backports should be raised in the release meeting by the corresponding L2)

[mandrenguyen]

+1