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Nupass performance 20230502 (#474)

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* Use par-each in main list builders

Using par-each on the main list builders for random words, symbols and numbers results in a significant performance gain

* Add benchmarking section

Explain how par-each really can improve performance
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Rick Cogley 2023-05-02 20:39:33 +09:00 • committed by GitHub
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sourced/misc/password_generator/ReadMe.md
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@ -54,7 +54,19 @@ If you're making changes to the script while testing, you can just re-source the
`use nupass.nu`
... which will reload the latest save.
... which will reload the latest you have saved.
From `nu` version 0.79.1, you can use the standard library, and use its bench command to do a benchmark. Load the standard library by adding `use std` in your `env.nu`, reload, then assuming `nupass.nu` is in your path, you can benchmark like so:
```
std bench --rounds 10 --verbose {nupass 10}
std bench --rounds 10 --verbose {nupass 100 -v diceware}
std bench --rounds 10 --verbose {nupass 1000 -v mixnmatch}
```
If you change the `par-each` to `each` in the main list builders for instance, you'll see a significant performance hit. When I benchmarked `nupass 100`, using just `each` took 7 sec per round, whereas changing to `par-each` dropped that to about 1 sec per round.
<img width="736" alt="image" src="https://user-images.githubusercontent.com/512328/235553238-48b48f37-0eae-48d3-8afe-e17515cd8325.png">
### Caveats