Add PortableHostCollection constructor for code that does not use alpaka

[fwyzard]

PR description:

Add a PortableHostCollection constructor for code that does not use alpaka explicitly.
It uses the global "host" object returned by cms::alpakatools::host() internally.

PR validation:

None.

[fwyzard]

enable gpu

[fwyzard]

please test

[cmsbuild]

cms-bot internal usage

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-49177/46473

• There are other open Pull requests which might conflict with changes you have proposed:
  • File DataFormats/Portable/interface/PortableHostCollection.h modified in PR(s): Extend CMSSW to a distributed application over MPI #32632, Implement a GenericCloner test module #47504, Added SoABlocks feature #48629, Added AoSWrapper and transposition function #49072, Implement a GenericCloner test module based on an edmplugin::PluginFactory #49152

[cmsbuild]

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

It involves the following packages:

• DataFormats/Portable (heterogeneous)

@fwyzard, @makortel can you please review it and eventually sign? Thanks.
@missirol, @mmusich, @rovere this is something you requested to watch as well.
@ftenchini, @mandrenguyen, @sextonkennedy you are the release manager for this.

cms-bot commands are listed here

[cmsbuild]

+1

Size: This PR adds an extra 24KB to repository
Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-b23b76/48707/summary.html
COMMIT: 100861c
CMSSW: CMSSW_16_0_X_2025-10-15-2300/el8_amd64_gcc13
Additional Tests: GPU,AMD_MI300X,AMD_W7900,NVIDIA_H100,NVIDIA_L40S,NVIDIA_T4
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week1/cms-sw/cmssw/49177/48707/install.sh to create a dev area with all the needed externals and cmssw changes.

The following merge commits were also included on top of IB + this PR after doing git cms-merge-topic:

• @martinamalberti MTD Validation: add optional histograms for ETL #49155

You can see more details here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-b23b76/48707/git-recent-commits.json
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-b23b76/48707/git-merge-result

Comparison Summary

Summary:

• You potentially added 5 lines to the logs
• Reco comparison results: 1 differences found in the comparisons
• DQMHistoTests: Total files compared: 51
• DQMHistoTests: Total histograms compared: 3939853
• DQMHistoTests: Total failures: 41
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3939792
• DQMHistoTests: Total skipped: 20
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: -29.1 KiB( 50 files compared)
• DQMHistoSizes: changed ( 29634.0,... ): -5.820 KiB MTD/Vertices
• Checked 218 log files, 188 edm output root files, 51 DQM output files
• TriggerResults: no differences found

AMD_W7900 Comparison Summary

Summary:

• You potentially added 10 lines to the logs
• Reco comparison results: 226 differences found in the comparisons
• DQMHistoTests: Total files compared: 11
• DQMHistoTests: Total histograms compared: 147869
• DQMHistoTests: Total failures: 33141
• DQMHistoTests: Total nulls: 10
• DQMHistoTests: Total successes: 114718
• DQMHistoTests: Total skipped: 0
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 10 files compared)
• Checked 42 log files, 45 edm output root files, 11 DQM output files
• TriggerResults: found differences in 1 / 10 workflows

NVIDIA_H100 Comparison Summary

Summary:

• You potentially removed 3 lines from the logs
• Reco comparison results: 233 differences found in the comparisons
• DQMHistoTests: Total files compared: 11
• DQMHistoTests: Total histograms compared: 147869
• DQMHistoTests: Total failures: 33993
• DQMHistoTests: Total nulls: 7
• DQMHistoTests: Total successes: 113869
• DQMHistoTests: Total skipped: 0
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 10 files compared)
• Checked 42 log files, 45 edm output root files, 11 DQM output files
• TriggerResults: no differences found

NVIDIA_L40S Comparison Summary

Summary:

• You potentially added 2 lines to the logs
• Reco comparison results: 265 differences found in the comparisons
• DQMHistoTests: Total files compared: 11
• DQMHistoTests: Total histograms compared: 147869
• DQMHistoTests: Total failures: 27014
• DQMHistoTests: Total nulls: 6
• DQMHistoTests: Total successes: 120849
• DQMHistoTests: Total skipped: 0
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 10 files compared)
• Checked 42 log files, 45 edm output root files, 11 DQM output files
• TriggerResults: no differences found

NVIDIA_T4 Comparison Summary

Summary:

• You potentially added 13 lines to the logs
• Reco comparison results: 237 differences found in the comparisons
• DQMHistoTests: Total files compared: 11
• DQMHistoTests: Total histograms compared: 147869
• DQMHistoTests: Total failures: 26854
• DQMHistoTests: Total nulls: 9
• DQMHistoTests: Total successes: 121006
• DQMHistoTests: Total skipped: 0
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 10 files compared)
• Checked 42 log files, 45 edm output root files, 11 DQM output files
• TriggerResults: found differences in 2 / 10 workflows

[fwyzard]

+heterogeneous

[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. @sextonkennedy, @mandrenguyen, @ftenchini (and backports should be raised in the release meeting by the corresponding L2)

[mandrenguyen]

+1