Project Meeting 2022.08.18

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

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.