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Nupass par each threads 20230504 (#477)

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* Update ReadMe.md

Added explanation of how to use new --threads switch to feed to the par-each loops

* Update nupass.nu

Added --threads flag to allow setting of same in par-each loops, for performance fine tuning
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Rick Cogley 2023-05-04 22:00:38 +09:00 • committed by GitHub
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sourced/misc/password_generator/ReadMe.md
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@ -20,11 +20,12 @@ http get https://raw.githubusercontent.com/RickCogley/jpassgen/master/genpass-di
let dictfile = $"/path/to/my/genpass-dict-jp"
```
5. Confirm and edit the default symbols list and diceware delimiter:
5. In the main function's flags section, confirm and edit the default symbols list, diceware delimiter and threads for par-each (double the number of your CPU cores seems to be a good sweet spot):
```
--symbols (-s): string = "!@#$%^&()_-+[]{}" # Symbols to use in password
--delimiter (-m): string = "-" # Delimiter for diceware
--threads (-t): int = 16 # Number of threads to use in par-each
```
6. Load the script with `use` in your `config.nu`, something like:
@ -64,7 +65,15 @@ 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.
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.
You can tweak it a little further by setting the threads for par-each.
```
std bench --rounds 10 --verbose {nupass 100 -v diceware -t 8}
std bench --rounds 10 --verbose {nupass 100 -v diceware -t 16}
std bench --rounds 10 --verbose {nupass 100 -v diceware -t 32}
```
<img width="736" alt="image" src="https://user-images.githubusercontent.com/512328/235553238-48b48f37-0eae-48d3-8afe-e17515cd8325.png">
@ -81,4 +90,3 @@ This command doesn't let you specify a precise length.
Thanks everyone on Discord for putting up with and answering my nubie questions @amtoine, @fdncred, @jelle, @sygmei, @kubouch and for the feedback after try number 1.
<img width="576" alt="image" src="https://user-images.githubusercontent.com/512328/235383307-d3f3d65d-c184-4dfa-9fe9-677b677d8531.png">