[Run3 PromptReco] HLTPrescaleProvider::init() uses 4.9 MB memory per stream

[makortel]

From #46040 (comment)

The HLTPrescaleProvider::init() is called by pat::PATTriggerProducer::beginRun() and BPHMonitor::bookHistograms(), and ends up using 4.9 MB memory per stream (compare 1 thread/stream profile and 4 thread/stream profile. For an 8-thread/stream prompt reco job this would correspond to 39 MB.

Most of the memory is held by l1t::L1TGlobalUtil::retrieveL1Setup() (similarly to #46448). Does it need to be replicated among streams?

[cmsbuild]

cms-bot internal usage

[cmsbuild]

A new Issue was created by @makortel.

@Dr15Jones, @antoniovilela, @makortel, @mandrenguyen, @rappoccio, @sextonkennedy, @smuzaffar can you please review it and eventually sign/assign? Thanks.

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[makortel]

assign hlt, l1

[cmsbuild]

New categories assigned: hlt,l1

@aloeliger,@epalencia,@Martin-Grunewald,@mmusich you have been requested to review this Pull request/Issue and eventually sign? Thanks

[makortel]

type performance-improvements