Adding option to disable resetting L1 PS counters on ls change [12_3_X]

[missirol]

backport of #37395

PR description:

Backport of #37395. This PR is needed by TSG for HLT-rate studies in 12_3_X. It simply adds an option to a producer without changing its defaults.

Description of the original PR by @Sam-Harper (cc: @silviodonato @Martin-Grunewald):

This PR adds an option to disable resetting the prescale counters of the L1 trigger on lumi section change. This is needed for offline L1 reemulations where we only have ~23000 events per lumisection available (often much much less due to multithreading/job splitting) and this reset comes too soon and causes triggers to have a much higher effective prescale or not fire at all. This is based on the excellent debugging and investigations by @sanuvarghese

Also could experts just confirm why the L1 resets counters every lumisection? I'm just curious to why.

Finally as spotted by both Sanu and myself, we note that this code can not work with fractional prescales. What is the plan here?

PR validation:

Relies on the validation done for the original PR.

If this PR is a backport, please specify the original PR and why you need to backport that PR:

#37395

Purpose: HLT development in 12_3_X.

[cmsbuild]

A new Pull Request was created by @missirol (Marino Missiroli) for CMSSW_12_3_X.

It involves the following packages:

• L1Trigger/L1TGlobal (l1)

@epalencia, @cmsbuild, @cecilecaillol, @rekovic can you please review it and eventually sign? Thanks.
@Martin-Grunewald this is something you requested to watch as well.
@perrotta, @dpiparo, @qliphy you are the release manager for this.

cms-bot commands are listed here

• Backported from Adding option to disable resetting L1 PS counters on ls change #37395

[missirol]

urgent

Targeting 12_3_0, to support HLT studies.

[missirol]

please test

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-62c53d/23650/summary.html
COMMIT: 9b65f06
CMSSW: CMSSW_12_3_X_2022-04-04-2300/slc7_amd64_gcc10
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week1/cms-sw/cmssw/37462/23650/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: 4 differences found in the comparisons
• DQMHistoTests: Total files compared: 49
• DQMHistoTests: Total histograms compared: 3697381
• DQMHistoTests: Total failures: 8
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3697351
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 48 files compared)
• Checked 204 log files, 45 edm output root files, 49 DQM output files
• TriggerResults: no differences found

[epalencia]

+l1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_12_3_X IBs (tests are also fine) and once validation in the development release cycle CMSSW_12_4_X is complete. This pull request will now be reviewed by the release team before it's merged. @perrotta, @dpiparo, @qliphy (and backports should be raised in the release meeting by the corresponding L2)

[perrotta]

+1

• Verbatim backport of Adding option to disable resetting L1 PS counters on ls change #37395