recipe.yaml

package:
  name: test
  version: 1.0.0

source:
  url: https://example.org
  sha256: 85866aa052a5a6153468ba31712ea49db6b7d3858d6b3d3f25b7fa926e04691f

requirements:
  host:
    - python
    - other
  run:
    - python

build:
  script: build-pkg

test.py

from itertools import chain
from pathlib import Path
import time

import wurlitzer
from ruamel.yaml import YAML
from rattler_build_conda_compat import render

yaml = YAML(typ="rt")

recipe_dir = Path(__file__).parent.resolve()
recipe_yaml = recipe_dir / "recipe.yaml"
with recipe_yaml.open() as f:
    recipe = yaml.load(f)

# 10 actually used variants
variants = {
    "python": [
        "3.9",
        "3.10",
        "3.11",
        "3.12",
        "3.13",
    ],
    "other": [
        "1",
        "2",
    ],
}
for dimension in range(3, 13):
    # add an unused variant dimension each iteration
    variants[f"unused_{dimension}"] = ["1", "2"]
    print(f"dimension: {dimension}")
    tic = time.perf_counter()
    with wurlitzer.pipes():
        metadatas = render.render_recipe(recipe_dir, variants=variants)
    t = time.perf_counter() - tic
    
    print(f"render_recipe produced {len(metadatas)} variants in {t:.1f}s")
    tic = time.perf_counter()
    with wurlitzer.pipes():
        metadata_tuples = render.render(recipe_dir, variants=variants)
    t = time.perf_counter() - tic
    print(f"render produced {len(metadata_tuples)} variants in {t:.1f}s")
    all_package_variants = list(chain(*[m[0].config.input_variants for m in metadata_tuples]))
    print(f"render computed a total of {len(all_package_variants)} package_variants")