nix-super/doc/manual/src/release-notes/rl-next.md

# Release X.Y (202?-??-??)

- Speed-up of downloads from binary caches.
  The number of parallel downloads (also known as substitutions) has been separated from the [`--max-jobs` setting](../command-ref/conf-file.md#conf-max-jobs).
  The new setting is called [`max-substitution-jobs`](../command-ref/conf-file.md#conf-max-substitution-jobs).
  The number of parallel downloads is now set to 16 by default (previously, the default was 1 due to the coupling to build jobs).
- The function `builtins.replaceStrings` is now lazy in the value of its second argument `to`, that is a replacee in `to` is only evaluated when its corresponding pattern in `from` is matched in the string `s`.
Fix the release-notes Slightly butchered during the merge 2023-01-30 11:32:23 +02:00			`# Release X.Y (202?-??-??)`

`max-substitution-jobs` release note entry 2023-05-13 13:25:06 +03:00			`- Speed-up of downloads from binary caches.`
			The number of parallel downloads (also known as substitutions) has been separated from the [`--max-jobs` setting](../command-ref/conf-file.md#conf-max-jobs).
			The new setting is called [`max-substitution-jobs`](../command-ref/conf-file.md#conf-max-substitution-jobs).
			`The number of parallel downloads is now set to 16 by default (previously, the default was 1 due to the coupling to build jobs).`
primops: lazy evaluation of replaceStrings replacements The primop `builtins.replaceStrings` currently always strictly evaluates the replacement strings, however time and space are wasted for their computation if the corresponding pattern do not occur in the input string. This commit makes the evaluation of the replacement strings lazy by deferring their evaluation to when the corresponding pattern are matched and memoize the result for efficient retrieval on subsequent matches. The testcases for replaceStrings was updated to check for lazy evaluation of the replacements. A note was also added in the release notes to document the behavior change. 2023-05-25 07:37:00 +03:00			- The function `builtins.replaceStrings` is now lazy in the value of its second argument `to`, that is a replacee in `to` is only evaluated when its corresponding pattern in `from` is matched in the string `s`.