enforce memory order to avoid crash on Ampere [11.3.x]

[fwyzard]

PR description:

Add missing memory fences to avoid crashes on Ampere (and potentially other) GPUs.

PR validation:

See #34386 .

####PR status:

Backport of #34386 .

[fwyzard]

backport of #34386

[fwyzard]

type bugfix

[fwyzard]

please test

[cmsbuild]

A new Pull Request was created by @fwyzard (Andrea Bocci) for CMSSW_11_3_X.

It involves the following packages:

• RecoPixelVertexing/PixelTriplets (reconstruction)

@perrotta, @jpata, @slava77 can you please review it and eventually sign? Thanks.
@felicepantaleo, @GiacomoSguazzoni, @JanFSchulte, @rovere, @VinInn, @mmusich, @mtosi, @dgulhan this is something you requested to watch as well.
@silviodonato, @dpiparo, @qliphy, @perrotta you are the release manager for this.

cms-bot commands are listed here

• Backported from enforce memory order to avoid crash on Ampere #34386

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-e0b01a/17443/summary.html
COMMIT: 113dba7
CMSSW: CMSSW_11_3_X_2021-08-01-0000/slc7_amd64_gcc900
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmssw/34736/17443/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• No significant changes to the logs found
• Reco comparison results: 0 differences found in the comparisons
• DQMHistoTests: Total files compared: 38
• DQMHistoTests: Total histograms compared: 2878314
• DQMHistoTests: Total failures: 1
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 2878291
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 37 files compared)
• Checked 160 log files, 37 edm output root files, 38 DQM output files
• TriggerResults: no differences found

[perrotta]

urgent

[slava77]

+reconstruction

for #34736 113dba7

• code changes are the same as in the master branch PR enforce memory order to avoid crash on Ampere #34386, which was merged about 4 weeks ago

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_11_3_X IBs (tests are also fine) and once validation in the development release cycle CMSSW_12_1_X is complete. This pull request will now be reviewed by the release team before it's merged. @silviodonato, @dpiparo, @qliphy, @perrotta (and backports should be raised in the release meeting by the corresponding L2)

[perrotta]

+1