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Mitigate performance drop when looking up the muon efficiency systematics

Johannes Junggeburth requested to merge (removed):MCP_WinterRecom into 21.2

Hi,

the merge request !20096 (merged) brought many updates to the MuonEfficiencyCorrections code. However, during the profiling of our code, we noticed that the look-up whether the systematic affects the tool or not takes occupies many resources.

Before:

image

After:

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This merge request tries to address the problem by introducing an extra map storing the systematic variation against the corresponding collection map.

Adding: @goblirsc, @jburr, @dguest, @pgadow and our well admired friend the @atlasbot.

Edited by Johannes Junggeburth

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