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Slowness in cmsRun starts #34633

@makortel

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@makortel

Last week @Dr15Jones and I noticed some slowness in cmsRun job startups (like up to 20 min). I noticed today

26-Jul-2021 16:08:26 CEST  Initiating request to open file file:step2.root
26-Jul-2021 16:08:28 CEST  Successfully opened file file:step2.root
%MSG-e HLTConfigProvider:  METAnalyzer:pfMetDQMAnalyzerMiniAOD@beginRun  26-Jul-2021 16:13:59 CEST Run: 274199
Begin processing the 1st record. Run 274199, Event 39389360, LumiSection 21 on stream 0 at 26-Jul-2021 16:15:00.232 CEST

in #34621 (comment).

I then tested locally workflow 10024.0 in CMSSW_12_0_X_2021-07-26-1100, and noticed the step2 to take 2 minutes from Successfully opened file and Begin processing the 1st record. The job really should not take 2 minutes to get there.

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