Agenda

• Admin Items
• Assessment of ActivitySim's memory usage (WSP)
• Schedule for sharrow code review (see https://github.com/ActivitySim/activitysim/wiki/Project-Meeting-2022.07.28 discussion for context)
• AVs in Vehicle Type Model #587 --- pushed to another meeting

Meeting Notes

• Sharrow code review priorities
  • There is enough code to be reviewed that having both WSP and RSG review is important
  • How to break it up between the two firms? Unclear. Both firms will need to review significant portions to understand what is going on.
  • Priorities are:
    • RSG to finish up their current work on school escorting and then switch to sharrow review.
• Assessment of Memory Usage
  • Presentation: ActivitySim Memory Memo.pdf
  • Memory problems being reported
    • Some models can’t run
    • Chunking is hard to set up or not working
  • Data
    • ActivitySim pipeline writes out complete data tables at checkpoints – not sure how much space/time/memory this process is using
      • Checkpoints are configurable, can be turned off or on for any step
      • Not much of a memory concern, but does use a ton of disk space and time to write it out
  • Data Types
    • ActivitySim data types are int64 and skims are float64
    • Is float64 giving a false sense of precision in the skims? Could be causing instability in assessing alternatives.