aaf86cc0d5
The underlying issue is that debugger code path was calling PosTable::operator[] in each eval method. This has become incredibly expensive since5d9fdab3de. While we are it it, I've reworked the code to not use std::shared_ptr where it really isn't necessary. As I've documented in previous commits, this is actually more a workaround for recursive header dependencies now and is only necessary in `error.hh` code. Some ad-hoc benchmarking: After this commit: ``` Benchmark 1: nix eval nixpkgs#hello --impure --ignore-try --no-eval-cache --debugger Time (mean ± σ): 784.2 ms ± 7.1 ms [User: 561.4 ms, System: 147.7 ms] Range (min … max): 773.5 ms … 792.6 ms 10 runs ``` On master 3604c7c51: ``` Benchmark 1: nix eval nixpkgs#hello --impure --ignore-try --no-eval-cache --debugger Time (mean ± σ): 22.914 s ± 0.178 s [User: 18.524 s, System: 4.151 s] Range (min … max): 22.738 s … 23.290 s 10 runs ``` (cherry picked from commitadbd08399c)
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
License
Nix is released under the LGPL v2.1.