2020-07-22 21:17:48 +00:00
|
|
|
# Release 0.16 (2010-08-17)
|
|
|
|
|
|
|
|
|
|
This release has the following improvements:
|
|
|
|
|
|
|
|
|
|
- The Nix expression evaluator is now much faster in most cases:
|
|
|
|
|
typically, [3 to 8 times compared to the old
|
|
|
|
|
implementation](http://www.mail-archive.com/nix-dev@cs.uu.nl/msg04113.html).
|
|
|
|
|
It also uses less memory. It no longer depends on the ATerm library.
|
|
|
|
|
|
|
|
|
|
- Support for configurable parallelism inside builders. Build scripts
|
|
|
|
|
have always had the ability to perform multiple build actions in
|
|
|
|
|
parallel (for instance, by running `make -j
|
|
|
|
|
2`), but this was not desirable because the number of actions to be
|
|
|
|
|
performed in parallel was not configurable. Nix now has an option
|
|
|
|
|
`--cores
|
|
|
|
|
N` as well as a configuration setting `build-cores =
|
2020-07-23 08:44:54 +00:00
|
|
|
N` that causes the environment variable `NIX_BUILD_CORES` to be set
|
2020-07-23 12:28:05 +00:00
|
|
|
to *N* when the builder is invoked. The builder can use this at its
|
2020-07-22 21:17:48 +00:00
|
|
|
discretion to perform a parallel build, e.g., by calling `make -j
|
|
|
|
|
N`. In Nixpkgs, this can be enabled on a per-package basis by
|
|
|
|
|
setting the derivation attribute `enableParallelBuilding` to `true`.
|
|
|
|
|
|
|
|
|
|
- `nix-store -q` now supports XML output through the `--xml` flag.
|
|
|
|
|
|
|
|
|
|
- Several bug fixes.
|
