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| author | Eelco Dolstra <eelco.dolstra@logicblox.com> | 2016-08-29 17:28:20 +0200 |
|---|---|---|
| committer | Eelco Dolstra <eelco.dolstra@logicblox.com> | 2016-08-29 19:36:54 +0200 |
| commit | 26d92017d3b36cff940dcb7d1611c42232edb81a (patch) | |
| tree | 856350170478111ea3a61b3b457e4fbee40826ce /tests | |
| parent | c0a7b84748d5e27e6804117b8a57ce71269c3c66 (diff) | |
Add builtin function "partition"
The implementation of "partition" in Nixpkgs is O(n^2) (because of the
use of ++), and for some reason was causing stack overflows in
multi-threaded evaluation (not sure why).
This reduces "nix-env -qa --drv-path" runtime by 0.197s and memory
usage by 298 MiB (in non-Boehm mode).
Diffstat (limited to 'tests')
| -rw-r--r-- | tests/lang/eval-okay-partition.exp | 1 | ||||
| -rw-r--r-- | tests/lang/eval-okay-partition.nix | 5 |
2 files changed, 6 insertions, 0 deletions
diff --git a/tests/lang/eval-okay-partition.exp b/tests/lang/eval-okay-partition.exp new file mode 100644 index 000000000..cd8b8b020 --- /dev/null +++ b/tests/lang/eval-okay-partition.exp @@ -0,0 +1 @@ +{ right = [ 0 2 4 6 8 10 100 102 104 106 108 110 ]; wrong = [ 1 3 5 7 9 101 103 105 107 109 ]; } diff --git a/tests/lang/eval-okay-partition.nix b/tests/lang/eval-okay-partition.nix new file mode 100644 index 000000000..846d2ce49 --- /dev/null +++ b/tests/lang/eval-okay-partition.nix @@ -0,0 +1,5 @@ +with import ./lib.nix; + +builtins.partition + (x: x / 2 * 2 == x) + (builtins.concatLists [ (range 0 10) (range 100 110) ]) |