Comments (6)
For sake of simplicity, I am copying the plots directly. As a reminder: "all matched tracks" means all mkFit tracks that are matched to a CMSSW tracks, including possible duplicates.
all matched tracks, diff eta, pT > 0
all matched tracks, diff eta, pT > 0.9
all matched tracks, diff eta, pT > 2
all matched tracks, diff 1/pT
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Same comment as other FV problems. will address later
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By going through the SMatrix Track class, the standard track finders filter out the -1, -3 and -4 fake hits (standard miss, outside and edge detector misses) due to this commit:
f36425c#diff-48dc3f60452a14992adbb68ea6e65a8e
Full vector isn't filtering those out, so it runs out of space to store hits more often than the other methods, especially in the transition regions where there are lots of detector element misses. This doesn't affect the build parameters, but means the backwards fit starts with a large gap from the last to the penultimate hit.
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I believe this also explains why #128 is specific to hit-based matching. The difference between CMSSW and simtrack hit-based matching is likely the difference in match thresholds.
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This is not resolved by #134 so it is still a mystery. I also mis-identified the relevant change in CE, I should have linked to
1365812#diff-1164fe0ca653386ef41ffe6b49535295R63
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Closing this issue for now, since we are moving away from validation FV. Will re-open if we decide to come back to FV.
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Related Issues (20)
- Adding information about bad modules in mkFit
- Can OpenMP runtime be dropped? HOT 3
- Remove SMatrix copy HOT 3
- Standalone fitting test is broken
- Implementation of CMSSW-like features to mkFit fitting
- update Makefile.config and init-env.sh for gcc8 HOT 4
- clean out KNC cruft from make HOT 1
- Number of builtcands depends on vector options HOT 4
- Building 2.0.1 with AVX2 fails HOT 17
- remove old and disused GPU code
- tip cut on tracks: update from 3.5 to 2.5
- Update mkFit for TBB v2021.1.1 compatibility HOT 2
- Difference between STD and CE from charge flip HOT 1
- Passing dummy invalid hits to CMSSW
- Technical cleanup for CMSSW
- Dead module checks & improvements
- segfaults and slowness for some build options HOT 5
- cannot use gcc option -ffast-math to enable vectorization HOT 1
- fake rate blows up below 0.8-0.9 GeV in initialStep HOT 5
- filter out candidates with nans and negative diagonal covariance elements
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