wehub-resource-sync
80 lines
3.0 KiB
Python
80 lines
3.0 KiB
Python
import io
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import unittest
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from unittest import mock
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from container_resource_utils import (
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get_container_cpu_limit,
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get_container_mem_limit_mb,
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get_system_ram_mb,
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main,
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)
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class TestResourceUtils(unittest.TestCase):
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def test_get_system_ram_mb_calculates_correctly(self):
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with mock.patch("os.sysconf") as m:
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m.side_effect = lambda k: 4096 if k == "SC_PAGE_SIZE" else 1048576
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# 1048576 pages * 4096 bytes / 1024^2 = 4096 MB
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self.assertEqual(get_system_ram_mb(), 4096)
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def test_get_container_cpu_limit_rounds_up_fractional(self):
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"""Ensures container fractional CPUs (e.g., 1.5) round up to 2."""
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with mock.patch("pathlib.Path.exists", return_value=True), mock.patch(
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"pathlib.Path.read_text", return_value="150000 100000"
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):
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self.assertEqual(get_container_cpu_limit(), 2)
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def test_mem_limit_falls_back_when_unlimited(self):
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"""Tests that 'max' or huge values fall back to host system RAM."""
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with mock.patch("pathlib.Path.read_text", return_value="max"), mock.patch(
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"container_resource_utils.get_system_ram_mb", return_value=16384
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):
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self.assertEqual(get_container_mem_limit_mb(), 16384)
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def test_main_bottleneck_by_ram(self):
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"""8GB RAM, 16 CPUs. Reserve 2GB, 3GB/job -> (8-2)/3 = 2 jobs max."""
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with mock.patch(
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"container_resource_utils.get_container_mem_limit_mb", return_value=8192
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), mock.patch(
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"container_resource_utils.get_container_cpu_limit", return_value=16
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), mock.patch(
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"sys.argv", ["prog"]
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), mock.patch(
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"sys.stdout", new=io.StringIO()
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) as out:
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main()
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self.assertIn("--jobs=2", out.getvalue())
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def test_main_bottleneck_by_cpu(self):
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"""32GB RAM, 2 CPUs. RAM allows ~10 jobs, but CPU limits to 2."""
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with mock.patch(
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"container_resource_utils.get_container_mem_limit_mb", return_value=32768
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), mock.patch(
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"container_resource_utils.get_container_cpu_limit", return_value=2
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), mock.patch(
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"sys.argv", ["prog"]
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), mock.patch(
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"sys.stdout", new=io.StringIO()
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) as out:
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main()
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self.assertIn("--jobs=2", out.getvalue())
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def test_cli_args_override_defaults(self):
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"""Verify CLI flags correctly change the calculation."""
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# 8GB RAM, 8 CPUs. Reserve 4GB, 1GB/job -> (8-4)/1 = 4 jobs.
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with mock.patch(
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"container_resource_utils.get_container_mem_limit_mb", return_value=8192
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), mock.patch(
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"container_resource_utils.get_container_cpu_limit", return_value=8
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), mock.patch(
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"sys.argv", ["prog", "--reserve-mb", "4096", "--mb-per-job", "1024"]
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), mock.patch(
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"sys.stdout", new=io.StringIO()
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) as out:
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main()
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self.assertIn("--jobs=4", out.getvalue())
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if __name__ == "__main__":
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unittest.main()
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