Faster Geant4 tracking in magnetic field

[civanch]

This modification include two improvements:

1. new Geant4 stepper G4DormandPrinc475 recommended by the Geant4 team
2. "Smart tracking" option enabled with the threshold 2 MeV: if a charged particle has smaller energy loose parameters of tracking in field are used (mainly affect low-energy e-)

As a result, simulation histories will be different and full validation is required.

[cmsbuild]

The code-checks are being triggered in jenkins.

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-23345/4847

[cmsbuild]

A new Pull Request was created by @civanch (Vladimir Ivantchenko) for master.

It involves the following packages:

SimG4Core/Application

@cmsbuild, @civanch, @mdhildreth can you please review it and eventually sign? Thanks.
@makortel this is something you requested to watch as well.
@davidlange6, @slava77, @fabiocos you are the release manager for this.

cms-bot commands are listed here

[prebello]

please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/28218/console Started: 2018/05/26 19:11

[cmsbuild]

+1
Tested at: 7c2fb75
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-23345/28218/summary.html

[cmsbuild]

Comparison job queued.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-23345/28218/summary.html

Comparison Summary:

• You potentially added 411 lines to the logs
• Reco comparison results: 31554 differences found in the comparisons
• DQMHistoTests: Total files compared: 31
• DQMHistoTests: Total histograms compared: 2901706
• DQMHistoTests: Total failures: 110646
• DQMHistoTests: Total nulls: 8
• DQMHistoTests: Total successes: 2790862
• DQMHistoTests: Total skipped: 190
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.088 KiB( 30 files compared)
• DQMHistoSizes: changed ( 8.0 ): 3.194 KiB SiStrip/MechanicalView
• DQMHistoSizes: changed ( 25202.0 ): -0.560 KiB SiStrip/MechanicalView
• DQMHistoSizes: changed ( 7.3 ): -2.644 KiB SiStrip/MechanicalView
• DQMHistoSizes: changed ( 250202.181 ): 0.293 KiB SiStrip/MechanicalView
• DQMHistoSizes: changed ( 10224.0 ): -0.195 KiB SiStrip/MechanicalView
• Checked 128 log files, 14 edm output root files, 31 DQM output files

[civanch]

+1
many différences are expected, because of different sim histories

[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. @davidlange6, @slava77, @smuzaffar, @fabiocos (and backports should be raised in the release meeting by the corresponding L2)

[fabiocos]

This PR is at present meant for parallel tests on top of CMSSW_10_2_0_pre4

[fabiocos]

hold

pending ongoing validation on top of CMSSW_10_2_0_pre4

[cmsbuild]

Pull request has been put on hold by @fabiocos
They need to issue an unhold command to remove the hold state or L1 can unhold it for all

[fabiocos]

unhold

[fabiocos]

+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 be automatically merged.