Fixes for low-level alpaka based utilities [14.0.x]

[fwyzard]

PR description:

Fix various low-level alpaka based utilities that were inadvertently mixing host and device code.

Required to build with alpaka in GPU-only mode.

PR validation:

Unit tests pass.

No impact on the HLT performance, as expected.
CMSSW_14_0_4:

Running 4 times over all events with 8 jobs, each with 32 threads, 24 streams and 1 GPUs
   514.3 ±   0.4 ev/s (11800 events, 99.8% overlap)
   533.3 ±   0.5 ev/s (11800 events, 99.7% overlap)
   523.0 ±   0.6 ev/s (11800 events, 100.0% overlap)
   514.8 ±   0.6 ev/s (11800 events, 99.3% overlap)
 --------------------
   521.3 ±   8.9 ev/s

CMSSW_14_0_4 with #44650:

Running 4 times over all events with 8 jobs, each with 32 threads, 24 streams and 1 GPUs
   520.0 ±   0.5 ev/s (11800 events, 99.8% overlap)
   505.8 ±   0.4 ev/s (11800 events, 99.8% overlap)
   559.7 ±   0.5 ev/s (11800 events, 99.8% overlap)
   514.0 ±   0.5 ev/s (11800 events, 99.9% overlap)
 --------------------
   524.9 ±  23.9 ev/s

If this PR is a backport please specify the original PR and why you need to backport that PR. If this PR will be backported please specify to which release cycle the backport is meant for:

Backport of #44640 to CMSSW 14.0.x for data taking.

[fwyzard]

type bugfix

[fwyzard]

backport #44640

[cmsbuild]

A new Pull Request was created by @fwyzard for CMSSW_14_0_X.

It involves the following packages:

• HeterogeneousCore/AlpakaInterface (heterogeneous)

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

cms-bot commands are listed here

• Backported from Fixes for low-level alpaka based utilities #44640

[cmsbuild]

cms-bot internal usage

[fwyzard]

+heterogeneous

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_14_0_X IBs after it passes the integration tests and once validation in the development release cycle CMSSW_14_1_X is complete. This pull request will now be reviewed by the release team before it's merged. @rappoccio, @antoniovilela, @sextonkennedy (and backports should be raised in the release meeting by the corresponding L2)

[fwyzard]

enable gpu

[fwyzard]

please test

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-4bd6ae/38659/summary.html
COMMIT: af05c33
CMSSW: CMSSW_14_0_X_2024-04-07-0000/el8_amd64_gcc12
Additional Tests: GPU
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmssw/44650/38659/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• You potentially added 27 lines to the logs
• Reco comparison results: 57 differences found in the comparisons
• DQMHistoTests: Total files compared: 49
• DQMHistoTests: Total histograms compared: 3346242
• DQMHistoTests: Total failures: 1352
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3344868
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 48 files compared)
• Checked 205 log files, 166 edm output root files, 49 DQM output files
• TriggerResults: no differences found

GPU Comparison Summary

Summary:

• No significant changes to the logs found
• Reco comparison results: 11 differences found in the comparisons
• DQMHistoTests: Total files compared: 3
• DQMHistoTests: Total histograms compared: 39740
• DQMHistoTests: Total failures: 509
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 39231
• DQMHistoTests: Total skipped: 0
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 2 files compared)
• Checked 8 log files, 10 edm output root files, 3 DQM output files
• TriggerResults: no differences found

[cmsbuild]

REMINDER @rappoccio, @sextonkennedy, @antoniovilela: This PR was tested with cms-sw/cmsdist#9125, please check if they should be merged together

[fwyzard]

REMINDER @rappoccio, @sextonkennedy, @antoniovilela: This PR was tested with cms-sw/cmsdist#9125, please check if they should be merged together

No, this PR should be merged before cms-sw/cmsdist#9125, but it can also be merged without it.

[antoniovilela]

+1