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diff --git a/setup.py b/setup.py
index 219583b..3ca5f88 100644
--- a/setup.py
+++ b/setup.py
@@ -170,23 +170,7 @@ class CMakeBuild(build_ext):
subprocess.check_call(cmake_build, cwd=build_folder)
def num_available_cpu_cores(ram_per_build_process_in_gb):
- if 'TRAVIS' in os.environ and os.environ['TRAVIS']=='true':
- # When building on travis-ci, just use 2 cores since travis-ci limits
- # you to that regardless of what the hardware might suggest.
- return 2
- elif 'CMAKE_BUILD_PARALLEL_LEVEL' in os.environ and os.environ['CMAKE_BUILD_PARALLEL_LEVEL'].isnumeric():
- return int(os.environ['CMAKE_BUILD_PARALLEL_LEVEL'])
- try:
- mem_bytes = os.sysconf('SC_PAGE_SIZE') * os.sysconf('SC_PHYS_PAGES')
- mem_gib = mem_bytes/(1024.**3)
- num_cores = multiprocessing.cpu_count()
- # make sure we have enough ram for each build process.
- mem_cores = int(floor(mem_gib/float(ram_per_build_process_in_gb)+0.5));
- # We are limited either by RAM or CPU cores. So pick the limiting amount
- # and return that.
- return max(min(num_cores, mem_cores), 1)
- except ValueError:
- return 2 # just assume 2 if we can't get the os to tell us the right answer.
+ return os.getenv("NIX_BUILD_CORES", 1)
from setuptools.command.test import test as TestCommand
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