Use only 1 thread when testing EventProcessor

[Dr15Jones]

PR description:

Explicitly call tbb::global_control in unit tests.

PR validation:

Code compiles and the tests pass. Running under gdb shows no additional threads happening during test (although TBB does start a few up when tbb::global_control is deleted).

fixes cms-sw/framework-team#136

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-33549/22330

• This PR adds an extra 20KB to repository

[cmsbuild]

A new Pull Request was created by @Dr15Jones (Chris Jones) for master.

It involves the following packages:

FWCore/Framework

@makortel, @smuzaffar, @cmsbuild, @Dr15Jones can you please review it and eventually sign? Thanks.
@makortel, @wddgit this is something you requested to watch as well.
@silviodonato, @dpiparo, @qliphy you are the release manager for this.

cms-bot commands are listed here

[Dr15Jones]

please test

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-ef87e6/14641/summary.html
COMMIT: 82ff50a
CMSSW: CMSSW_12_0_X_2021-04-27-1100/slc7_amd64_gcc900
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmssw/33549/14641/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:

• Add copyAndAdd() to Task for easier interplay with Modifier #33515 @makortel: Add copyAndAdd() to Task for easier interplay with Modifier
• Fix conditions dumping for specific tags #33411 @akhukhun: Fix conditions dumping for specific tags

You can see more details here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-ef87e6/14641/git-recent-commits.json
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-ef87e6/14641/git-merge-result

Comparison Summary

Summary:

• No significant changes to the logs found
• Reco comparison results: 3038 differences found in the comparisons
• DQMHistoTests: Total files compared: 38
• DQMHistoTests: Total histograms compared: 2877605
• DQMHistoTests: Total failures: 7710
• DQMHistoTests: Total nulls: 1
• DQMHistoTests: Total successes: 2869872
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: -0.004 KiB( 37 files compared)
• DQMHistoSizes: changed ( 312.0 ): -0.004 KiB MessageLogger/Warnings
• Checked 160 log files, 37 edm output root files, 38 DQM output files
• TriggerResults: found differences in 1 / 37 workflows

[makortel]

Differences are in DD4Hep (#33552), MessageLogger, and apparently a new irreproducibility in DQM histogram EgammaV/ElectronMcSignalValidatorMiniAOD/h_ele_neutralHadronRelativeIso_mAOD_recomp in workflows 10024.0 and 10224.0.

[makortel]

+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. @silviodonato, @dpiparo, @qliphy (and backports should be raised in the release meeting by the corresponding L2)

[qliphy]

+1