Avoid unnecessary cotan and division operations #388
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slava77
reviewed
Nov 28, 2021
mkFit/MkStdSeqs.cc
Outdated
| @@ -231,19 +231,20 @@ int clean_cms_seedtracks_iter(TrackVec *seed_ptr, const IterationConfig& itrcfg, | |||
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| const float dr2 = deta2+dphi*dphi; | |||
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| const float thisDZ = z[ts]-z[tss]-thisDXY*(1.f/std::tan(theta[ts])+1.f/std::tan(theta[tss])); | |||
| //const float thisDZ = z[ts]-z[tss]-thisDXY*(1.f/std::tan(theta[ts])+1.f/std::tan(theta[tss])); | |||
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Suggested change
| //const float thisDZ = z[ts]-z[tss]-thisDXY*(1.f/std::tan(theta[ts])+1.f/std::tan(theta[tss])); |
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PR description
As per title, avoid unnecessary expensive operations.
PR validation
TTbarPU50: https://mmasciovecchio.web.cern.ch/BTV_Nov2021/MTV_extraspeedup_Nov28/
--> No effect on physics.
--> Despite overall 'offset', it is clear that building time is reduced significantly for mkFit iterations:
https://mmasciovecchio.web.cern.ch/BTV_Nov2021/MTV_extraspeedup_Nov28/plots_timing/iterationsReal.pdf