[Run3 PromptReco] CSCTriggerPrimitivesProducer constructor uses 30 MB / stream

[makortel]

Noticed in #46040 (comment) CSCTriggerPrimitivesProducer is an edm::stream EDProducer, and allocates 30 MB / stream. On an 8-thread/stream PromptReco job this means 240 MB.

If every stream would not really need its own copy, the PromptReco memory consumption could be potentially reduced by 210 MB.

In addition of the CSCMotherboard (via CSCTriggerPrimitivesBuilder) holding nearly all the 30 MB / stream memory, the CSCMotherboard::run() results in ~500 k memory allocations per event (~2.4 % of all allocations done during event processing).

[makortel]

assign L1Trigger/CSCTriggerPrimitives

[cmsbuild]

New categories assigned: l1

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

[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.

cms-bot commands are listed here

[makortel]

type performance-improvements

[makortel]

In addition of the CSCMotherboard (via CSCTriggerPrimitivesBuilder) holding nearly all the 30 MB / stream memory, the CSCMotherboard::run() results in ~500 k memory allocations per event (~2.4 % of all allocations done during event processing).

[makortel]

Ping @cms-sw/l1-l2

[makortel]

Came up in #46975 (comment)