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Eelco Dolstra 2025-07-07 15:49:12 +02:00
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doc/manual/source/release-notes/rl-2.30.md
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@ -35,13 +35,13 @@ This release has a number performance improvements, in particular:
- Add stack sampling evaluation profiler [#13220](https://github.com/NixOS/nix/pull/13220) - Add stack sampling evaluation profiler [#13220](https://github.com/NixOS/nix/pull/13220)
Nix evaluator now supports stack sampling evaluation profiling via `--eval-profiler flamegraph` setting. The Nix evaluator now supports [stack sampling evaluation profiling](@docroot@/advanced-topics/eval-profiler.md) via the `--eval-profiler flamegraph` setting.
It collects collapsed call stack information to output file specified by It outputs collapsed call stack information to the file specified by
`--eval-profile-file` (`nix.profile` by default) in a format directly consumable `--eval-profile-file` (`nix.profile` by default) in a format directly consumable
by `flamegraph.pl` and compatible tools like [speedscope](https://speedscope.app/). by `flamegraph.pl` and compatible tools like [speedscope](https://speedscope.app/).
Sampling frequency can be configured via `--eval-profiler-frequency` (99 Hz by default). Sampling frequency can be configured via `--eval-profiler-frequency` (99 Hz by default).
Unlike existing `--trace-function-calls` this profiler includes the name of the function Unlike the existing `--trace-function-calls`, this profiler includes the name of the function
being called when it's available. being called when it's available.
- `nix repl` prints which variables were loaded [#11406](https://github.com/NixOS/nix/pull/11406) - `nix repl` prints which variables were loaded [#11406](https://github.com/NixOS/nix/pull/11406)