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5e74c0e4d6
This patch adds support for a native stack sampling profiler to the evaluator, which saves a collapsed stack profile information to a configurable location. Introduced options (in `EvalSettings`): - `eval-profile-file` - path to the collected profile file. - `eval-profiler-frequency` - sampling frequency. - `eval-profiler` - enumeration option for enabling the profiler. Currently only `flamegraph` is supported, but having this an enumeration rather than a boolean switch leaves the door open for other profiler variants (e.g. tracy). Profile includes the following information on best-effort basis (e.g. some lambdas might have an undefined name). Callstack information contains: - Call site location (where the function gets called). - Primop/lambda name of the function being called. - Functors/partial applications don't have a name attached to them unlike special-cased primops and lambads. For cases where callsite location isn't available we have to resort to providing the location where the lambda itself is defined. This removes some of the confusing `«none»:0` locations in the profile from previous attempts. Example usage with piping directly into zstd for compression: ``` nix eval --no-eval-cache nixpkgs#nixosTests.gnome \ --eval-profiler flamegraph \ --eval-profile-file >(zstd -of nix.profile.zstd) ``` Co-authored-by: Jörg Thalheim <joerg@thalheim.io> |
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| .clang-format | ||
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| CITATION.cff | ||
| CONTRIBUTING.md | ||
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| default.nix | ||
| docker.nix | ||
| flake.lock | ||
| flake.nix | ||
| HACKING.md | ||
| meson.build | ||
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| precompiled-headers.h | ||
| README.md | ||
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Nix
Nix is a powerful package manager for Linux and other Unix systems that makes package management reliable and reproducible. Please refer to the Nix manual for more details.
Installation and first steps
Visit nix.dev for installation instructions and beginner tutorials.
Full reference documentation can be found in the Nix manual.
Building and developing
Follow instructions in the Nix reference manual to set up a development environment and build Nix from source.
Contributing
Check the contributing guide if you want to get involved with developing Nix.
Additional resources
Nix was created by Eelco Dolstra and developed as the subject of his PhD thesis The Purely Functional Software Deployment Model, published 2006. Today, a world-wide developer community contributes to Nix and the ecosystem that has grown around it.
- The Nix, Nixpkgs, NixOS Community on nixos.org
- Official documentation on nix.dev
- Nixpkgs is the largest, most up-to-date free software repository in the world
- NixOS is a Linux distribution that can be configured fully declaratively
- Discourse
- Matrix: #users:nixos.org for user support and #nix-dev:nixos.org for development
License
Nix is released under the LGPL v2.1.