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Eelco Dolstra 3f796514b3 Optimize empty list constants 
This avoids a Value allocation for empty list constants. During a `nix
search nixpkgs`, about 82% of all thunked lists are empty, so this
removes about 3 million Value allocations.

Performance comparison on `nix search github:NixOS/nixpkgs/e1fa12d4f6c6fe19ccb59cac54b5b3f25e160870 --no-eval-cache`:

maximum RSS:        median = 3845432.0000  mean = 3845432.0000  stddev =      0.0000  min = 3845432.0000  max = 3845432.0000  [rejected?, p=0.00000, Δ=-70084.00000±0.00000]
soft page faults:   median = 965395.0000  mean = 965394.6667  stddev =      1.1181  min = 965392.0000  max = 965396.0000  [rejected?, p=0.00000, Δ=-17929.77778±38.59610]
system CPU time:    median =      1.8029  mean =      1.7702  stddev =      0.0621  min =      1.6749  max =      1.8417  [rejected, p=0.00064, Δ=-0.12873±0.09905]
user CPU time:      median =     14.1022  mean =     14.0633  stddev =      0.1869  min =     13.8118  max =     14.3190  [not rejected, p=0.03006, Δ=-0.18248±0.24928]
elapsed time:       median =     15.8205  mean =     15.8618  stddev =      0.2312  min =     15.5033  max =     16.1670  [not rejected, p=0.00558, Δ=-0.28963±0.29434]
2024-01-02 12:49:11 +01:00
.github build(deps): bump zeebe-io/backport-action from 2.2.0 to 2.3.0 2023-12-18 22:36:31 +00:00
config Run autoupdate 2021-06-01 11:42:38 +02:00
contrib function-trace: always show the trace 2019-09-18 23:23:21 +02:00
doc Change "dervation" typos to "derivation" 2023-12-26 17:12:28 -05:00
m4 Add configure test to ensure GCC bug is fixed 2023-10-31 12:09:46 -04:00
maintainers flake.nix: Use config not system for cross so we can be a bit more precise 2023-12-11 12:31:27 -05:00
misc Remove custom lowdown 2023-12-13 16:25:18 -05:00
mk Split --disable-tests, fix cross builds 2023-12-18 10:47:50 -05:00
perl Organize content addressing, use SourceAccessor with Store::addToStore 2023-12-18 10:41:54 -05:00
scripts installer: allow overriding of NIX_FIRST_BUILD_ID on darwin 2023-12-18 15:02:26 -08:00
src Optimize empty list constants 2024-01-02 12:49:11 +01:00
tests Build IFD in the build store when using eval-store. 2023-12-23 21:33:56 -05:00
.dir-locals.el .dir-locals.el: Set c-block-comment-prefix 2020-07-10 11:21:06 +02:00
.editorconfig .editorconfig: Also affect Perl FFI xs file 2023-11-09 23:11:52 -05:00
.gitignore Move tests to separate directories, and document 2023-12-01 10:48:58 -05:00
.version Bump version 2023-11-20 15:06:28 +01:00
boehmgc-coroutine-sp-fallback.diff Fix boehmgc-coroutine-sp-fallback.diff for FreeBSD 2023-09-20 09:04:42 -04:00
boehmgc-traceable_allocator-public.diff Use boost::container::small_vector in place of VLAs 2023-11-21 20:52:27 +01:00
configure.ac Split --disable-tests, fix cross builds 2023-12-18 10:47:50 -05:00
CONTRIBUTING.md Merge pull request #9182 from fricklerhandwerk/popular-issues 2023-10-19 16:25:36 -04:00
COPYING * Change this to LGPL to keep the government happy. 2006-04-25 16:41:06 +00:00
default.nix add flake-compat to flake.nix and use sha256 in default.nix 2023-03-06 21:11:24 +01:00
docker.nix fix "add an option to include flake-registry..." 2023-05-16 14:35:31 +02:00
flake.lock Remove custom lowdown 2023-12-13 16:25:18 -05:00
flake.nix package: don't set sysconfdir in devShells 2023-12-18 12:59:58 -08:00
local.mk Use positive source filtering for the standalone functional tests job 2023-10-09 08:29:27 -04:00
Makefile Move down fallback targets in Makefile 2023-12-20 03:23:49 -05:00
Makefile.config.in Split --disable-tests, fix cross builds 2023-12-18 10:47:50 -05:00
package.nix package: don't set sysconfdir in devShells 2023-12-18 12:59:58 -08:00
precompiled-headers.h Config: Use nlohmann/json 2020-08-20 11:02:16 +02:00
README.md fix: Remove extra to from README.md (#9213) 2023-10-23 19:20:23 +02:00
shell.nix Remove url literals 2022-01-24 13:28:21 +01:00

README.md

Nix

Open Collective supporters Test

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

See our Hacking guide in our manual for instruction on how 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

License

Nix is released under the LGPL v2.1.