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Study layout effects on LHCB B2HHH analysis #672

Merged
merged 1 commit into from
Jan 17, 2023
Merged

Study layout effects on LHCB B2HHH analysis #672

merged 1 commit into from
Jan 17, 2023

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bernhardmgruber
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@bernhardmgruber bernhardmgruber commented Jan 11, 2023 •
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This changeset extends the ROOT LHCB B2HHH analysis example:

  • Parallelize histogram generation
  • Test multiple memory layouts
  • Save histograms to disk
  • Extend benchmark result by mean, stddev, error

@bernhardmgruber bernhardmgruber changed the title Lhcb Study layout effects on LHCB analysis Jan 11, 2023
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codecov bot commented Jan 11, 2023 •
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Codecov Report

Merging #672 (17fd7d3) into develop (17fd7d3) will not change coverage.
The diff coverage is n/a.

❗ Current head 17fd7d3 differs from pull request most recent head aed252c. Consider uploading reports for the commit aed252c to get more accurate results

Additional details and impacted files 
@@           Coverage Diff            @@
##           develop     #672   +/-   ##
========================================
  Coverage    98.77%   98.77%           
========================================
  Files           74       74           
  Lines         6925     6925           
========================================
  Hits          6840     6840           
  Misses          85       85

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bernhardmgruber commented Jan 13, 2023 •
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Here is an animation of the impact of used mantissa bits on the observable:
bitpacked_mantissa_animation
And exponent bits:
bitpacked_exponent_animation

@bernhardmgruber bernhardmgruber changed the title Study layout effects on LHCB analysis Study layout effects on LHCB B2HHH analysis Jan 13, 2023
@bernhardmgruber
Extend ROOT LHCB analysis
aed252c 
* Parallelize histogram generation
* Test multiple memory layouts
* Extend benchmark result by mean, stddev, error
* Dump histograms to disk
* Dump layouts to disk
* Dump heatmaps to disk
* Add custom layout fitting access pattern
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AoS heatmap of first 10000 events:
image

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AoS layout visualization:
image

image
Where the Custom layout bitpacks H1isMuon/H2isMuon/H3isMuon as AoS, 1 bit each, into a blob of their own, then groups H1ProbK and H2ProbK as AoS in a separate blob, then the rest as AoS in another blob. The Custom layout has been built up gradually using insights obtained via instrumentation and benchmarking.

@bernhardmgruber bernhardmgruber marked this pull request as ready for review January 16, 2023 18:10
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Data set sizes:
image

@bernhardmgruber bernhardmgruber merged commit 96ad5b8 into alpaka-group:develop Jan 17, 2023
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