[12.5.X] zeroing error of Pixel barycenter ME and other optimizations

[mmusich]

backport of #39448

PR description:

Title says is all, to allow cleaner pixel barycenter comparisons when validating conditions updates, cf e.g.: https://tinyurl.com/2nupfvg2 .
Profited to add a couple of minor code optimizations.

PR validation:

cmssw compiles

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:

verbatim backport of #39448 for data-taking purposes

[cmsbuild]

A new Pull Request was created by @mmusich (Marco Musich) for CMSSW_12_5_X.

It involves the following packages:

• DQM/SiPixelPhase1Summary (dqm)

@emanueleusai, @ahmad3213, @cmsbuild, @jfernan2, @syuvivida, @pmandrik, @micsucmed, @rvenditti can you please review it and eventually sign? Thanks.
@arossi83, @hdelanno, @sroychow, @fioriNTU, @jandrea, @idebruyn, @threus this is something you requested to watch as well.
@perrotta, @dpiparo, @rappoccio you are the release manager for this.

cms-bot commands are listed here

• Backported from zeroing error of Pixel barycenter ME and other optimizations #39448

[mmusich]

please test

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-29900d/27980/summary.html
COMMIT: 8afd7ce
CMSSW: CMSSW_12_5_X_2022-10-04-1100/el8_amd64_gcc10
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week1/cms-sw/cmssw/39593/27980/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: 8 differences found in the comparisons
• DQMHistoTests: Total files compared: 51
• DQMHistoTests: Total histograms compared: 3699454
• DQMHistoTests: Total failures: 13
• DQMHistoTests: Total nulls: 1
• DQMHistoTests: Total successes: 3699418
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: -0.004 KiB( 50 files compared)
• DQMHistoSizes: changed ( 312.0 ): -0.004 KiB MessageLogger/Warnings
• Checked 212 log files, 49 edm output root files, 51 DQM output files
• TriggerResults: no differences found

[mmusich]

@cms-sw/dqm-l2 any objection to signing this backport?

[emanueleusai]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_12_5_X IBs (tests are also fine) and once validation in the development release cycle CMSSW_12_6_X is complete. This pull request will now be reviewed by the release team before it's merged. @perrotta, @dpiparo, @rappoccio (and backports should be raised in the release meeting by the corresponding L2)

[perrotta]

+1