[Rivet][OpenMP] Disable OpenMP for aarch64

[smuzaffar]

We noticed many Relvals fails for aarch64 due to OpenMP cannot allocate memory in static TLS block. This is happening as Rivet library is dynamically linked to gomp which CMSSW plugin manager loads using dlopen. We only see such crashes for aarch64 releases, so this PR suggests to disable openmp for aarch64.

[cmsbuild]

A new Pull Request was created by @smuzaffar (Malik Shahzad Muzaffar) for branch IB/CMSSW_11_2_X/master.

@cmsbuild, @smuzaffar, @mrodozov can you please review it and eventually sign? Thanks.
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[smuzaffar]

please test workflow 1331.0 for slc7_aarch64_gcc820

[cmsbuild]

The tests are being triggered in jenkins.
Test Parameters:

• ARCHITECTURE_FILTER = slc7_aarch64_gcc820
• MATRIX_EXTRAS = 1331.0
• CMSSW_11_2_X_2020-11-18-1100/slc7_aarch64_gcc820: https://cmssdt.cern.ch/jenkins/job/ib-run-pr-tests/10843/console Started: 2020/11/18 18:45

[cmsbuild]

-1

Tested at: 624548f

CMSSW: CMSSW_11_2_X_2020-11-18-1100
SCRAM_ARCH: slc7_aarch64_gcc820
You can see the results of the tests here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-8c5e72/10843/summary.html

I found follow errors while testing this PR

Failed tests: AddOn

• AddOn:

I found errors in the following addon tests:

cmsDriver.py TTbar_13TeV_TuneCUETP8M1_cfi --conditions auto:run2_mc_l1stage1 --fast -n 100 --eventcontent AODSIM,DQM --relval 100000,1000 -s GEN,SIM,RECOBEFMIX,DIGI:pdigi_valid,L1,DIGI2RAW,L1Reco,RECO,EI,VALIDATION --customise=HLTrigger/Configuration/CustomConfigs.L1THLT --datatier GEN-SIM-DIGI-RECO,DQMIO --beamspot NominalCollision2015 --era Run2_25ns : FAILED - time: date Wed Nov 18 21:31:04 2020-date Wed Nov 18 21:28:06 2020 s - exit: 35584

[cmsbuild]

Comparison job queued.

[smuzaffar]

looks good for aarch. There nothing changed for other archs.