Faster random numbers - #1103

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jpn-- wants to merge 43 commits into

ActivitySim:mainfrom

driftlesslabs:reroll

Commits on Aug 8, 2026

merge reroll
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318ab72
add fast channel test
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496fd26
configurable RNG channel type
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94fda02
remove extra gitignores
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a08b9d8
change default from fast to simple
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7ed8fff
reseed only when needed
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66d0540
SFC64 with quick entropy
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1275cf0
reseed in tests
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235e929
update test targets
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78a9116
fix tests
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aa0fbde
add a script to demonstrate random runtime performance gains
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2ee22df
fix test targets
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44f8ced
performance check script
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636c0b2
action to run performance checks
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84767ca
temporary push trigger
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b315358
updates for push
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3a1cf68
make it run on windows
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bcbdc25
add os to artifact filename
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52adc1f
use fold-in style reseeding
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657bf78
update test targets for faster seeds
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ac30986
update test targets
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acd48b0
Add complete fast-channel choice API
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bb18f29
Support RNG offset resets in fast channels
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02155de
Preserve normal draw shape compatibility
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c016b1e
Declare cffi as a runtime dependency
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fecc87c
Preserve destination logsum regression coverage
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f44ea6b
Make performance checks opt-in
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61f5b9d
Align RNG defaults and benchmark documentation
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763a8a0

Commits on Aug 9, 2026

Fix quick PCG64 state initialization
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bbb9423
Document random channel configuration
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36d429c
Validate quick entropy streams
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6b1c5f1
Freeze fast RNG reproducibility contract
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9061aa7
Correct and expand RNG benchmarks
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5eb3cb6
address broadcasting concern
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1e29011
improved docs on randomness
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bcce455

Commits on Aug 19, 2026

Merge branch 'ActivitySim:main' into reroll
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bbeb31f
faster gumbel draw

dhensle
authored and
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06fcddc
faster skim lookup

dhensle
authored and
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9f0bc56
Expand random channel performance benchmarks
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88a11b1

Commits on Sep 9, 2026

Bound fast-channel EET temporary memory
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2d9e34a
Preserve RNG streams for zero-size draws
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ed4f3c3
Validate fast-channel choice inputs before drawing
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72902ca

Commits on Sep 18, 2026

Rename RNG channels to legacy, pcg64, and sfc64_hash
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4e1cced