DAQ input throttling (12_0_X)

[smorovic]

Adding a mechanism to throttle processing using the input source when notified by the hltd daemon using a file marker.
This mechanism is implemented to have data safety and backpressure mechanism in DAQ with a limited size ramdisk now used as the output disk on HLT Filter Units.

We are planning to push this into production if possible during this week, so please review as soon as possible.

PR validation:
Tested in a small scale DAQ/HLT setup in CERN openstack.

This PR is a backport of #35833

[cmsbuild]

A new Pull Request was created by @smorovic (Srecko Morovic) for CMSSW_12_0_X.

It involves the following packages:

• EventFilter/Utilities (daq, reconstruction)

@jpata, @cmsbuild, @emeschi, @smorovic, @slava77 can you please review it and eventually sign? Thanks.
@Martin-Grunewald, @missirol 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

[smorovic]

@cmsbuild please test

[smorovic]

+daq

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-523a10/19920/summary.html
COMMIT: a31071e
CMSSW: CMSSW_12_0_X_2021-10-25-1100/slc7_amd64_gcc900
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmssw/35837/19920/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: 2 differences found in the comparisons
• DQMHistoTests: Total files compared: 39
• DQMHistoTests: Total histograms compared: 2998564
• DQMHistoTests: Total failures: 6
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 2998536
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 38 files compared)
• Checked 165 log files, 37 edm output root files, 39 DQM output files
• TriggerResults: no differences found

[slava77]

+reconstruction

for #35837 a31071e

• code changes are outside of reco files (tcdsraw2digi) in the shared EventFilter/Utilities package
• code changes are the same as in the master version DAQ input throttling (12_1_X) #35833

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_12_0_X IBs (tests are also fine) and once validation in the development release cycle CMSSW_12_1_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

• Let have this switched off also in 12_0, even without waiting for the master IB which contains the same update, to speed up the build of 12_0_3_patch1: the update doesn't look harmful anyhow