Pillow/Tests/test_core_resources.py

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import sys
import unittest
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from PIL import Image
from .helper import PillowTestCase, is_pypy
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def test_get_stats():
# Create at least one image
Image.new("RGB", (10, 10))
stats = Image.core.get_stats()
assert "new_count" in stats
assert "reused_blocks" in stats
assert "freed_blocks" in stats
assert "allocated_blocks" in stats
assert "reallocated_blocks" in stats
assert "blocks_cached" in stats
def test_reset_stats():
Image.core.reset_stats()
stats = Image.core.get_stats()
assert stats["new_count"] == 0
assert stats["reused_blocks"] == 0
assert stats["freed_blocks"] == 0
assert stats["allocated_blocks"] == 0
assert stats["reallocated_blocks"] == 0
assert stats["blocks_cached"] == 0
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class TestCoreMemory(PillowTestCase):
def tearDown(self):
# Restore default values
Image.core.set_alignment(1)
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Image.core.set_block_size(1024 * 1024)
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Image.core.set_blocks_max(0)
Image.core.clear_cache()
def test_get_alignment(self):
alignment = Image.core.get_alignment()
self.assertGreater(alignment, 0)
def test_set_alignment(self):
for i in [1, 2, 4, 8, 16, 32]:
Image.core.set_alignment(i)
alignment = Image.core.get_alignment()
self.assertEqual(alignment, i)
# Try to construct new image
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Image.new("RGB", (10, 10))
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self.assertRaises(ValueError, Image.core.set_alignment, 0)
self.assertRaises(ValueError, Image.core.set_alignment, -1)
self.assertRaises(ValueError, Image.core.set_alignment, 3)
def test_get_block_size(self):
block_size = Image.core.get_block_size()
self.assertGreaterEqual(block_size, 4096)
def test_set_block_size(self):
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for i in [4096, 2 * 4096, 3 * 4096]:
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Image.core.set_block_size(i)
block_size = Image.core.get_block_size()
self.assertEqual(block_size, i)
# Try to construct new image
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Image.new("RGB", (10, 10))
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self.assertRaises(ValueError, Image.core.set_block_size, 0)
self.assertRaises(ValueError, Image.core.set_block_size, -1)
self.assertRaises(ValueError, Image.core.set_block_size, 4000)
def test_set_block_size_stats(self):
Image.core.reset_stats()
Image.core.set_blocks_max(0)
Image.core.set_block_size(4096)
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Image.new("RGB", (256, 256))
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stats = Image.core.get_stats()
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self.assertGreaterEqual(stats["new_count"], 1)
self.assertGreaterEqual(stats["allocated_blocks"], 64)
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if not is_pypy():
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self.assertGreaterEqual(stats["freed_blocks"], 64)
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def test_get_blocks_max(self):
blocks_max = Image.core.get_blocks_max()
self.assertGreaterEqual(blocks_max, 0)
def test_set_blocks_max(self):
for i in [0, 1, 10]:
Image.core.set_blocks_max(i)
blocks_max = Image.core.get_blocks_max()
self.assertEqual(blocks_max, i)
# Try to construct new image
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Image.new("RGB", (10, 10))
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self.assertRaises(ValueError, Image.core.set_blocks_max, -1)
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if sys.maxsize < 2 ** 32:
self.assertRaises(ValueError, Image.core.set_blocks_max, 2 ** 29)
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@unittest.skipIf(is_pypy(), "images are not collected")
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def test_set_blocks_max_stats(self):
Image.core.reset_stats()
Image.core.set_blocks_max(128)
Image.core.set_block_size(4096)
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Image.new("RGB", (256, 256))
Image.new("RGB", (256, 256))
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stats = Image.core.get_stats()
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self.assertGreaterEqual(stats["new_count"], 2)
self.assertGreaterEqual(stats["allocated_blocks"], 64)
self.assertGreaterEqual(stats["reused_blocks"], 64)
self.assertEqual(stats["freed_blocks"], 0)
self.assertEqual(stats["blocks_cached"], 64)
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@unittest.skipIf(is_pypy(), "images are not collected")
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def test_clear_cache_stats(self):
Image.core.reset_stats()
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Image.core.clear_cache()
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Image.core.set_blocks_max(128)
Image.core.set_block_size(4096)
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Image.new("RGB", (256, 256))
Image.new("RGB", (256, 256))
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# Keep 16 blocks in cache
Image.core.clear_cache(16)
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stats = Image.core.get_stats()
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self.assertGreaterEqual(stats["new_count"], 2)
self.assertGreaterEqual(stats["allocated_blocks"], 64)
self.assertGreaterEqual(stats["reused_blocks"], 64)
self.assertGreaterEqual(stats["freed_blocks"], 48)
self.assertEqual(stats["blocks_cached"], 16)
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def test_large_images(self):
Image.core.reset_stats()
Image.core.set_blocks_max(0)
Image.core.set_block_size(4096)
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Image.new("RGB", (2048, 16))
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Image.core.clear_cache()
stats = Image.core.get_stats()
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self.assertGreaterEqual(stats["new_count"], 1)
self.assertGreaterEqual(stats["allocated_blocks"], 16)
self.assertGreaterEqual(stats["reused_blocks"], 0)
self.assertEqual(stats["blocks_cached"], 0)
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if not is_pypy():
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self.assertGreaterEqual(stats["freed_blocks"], 16)
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class TestEnvVars(PillowTestCase):
def tearDown(self):
# Restore default values
Image.core.set_alignment(1)
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Image.core.set_block_size(1024 * 1024)
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Image.core.set_blocks_max(0)
Image.core.clear_cache()
def test_units(self):
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Image._apply_env_variables({"PILLOW_BLOCKS_MAX": "2K"})
self.assertEqual(Image.core.get_blocks_max(), 2 * 1024)
Image._apply_env_variables({"PILLOW_BLOCK_SIZE": "2m"})
self.assertEqual(Image.core.get_block_size(), 2 * 1024 * 1024)
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def test_warnings(self):
self.assert_warning(
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UserWarning, Image._apply_env_variables, {"PILLOW_ALIGNMENT": "15"}
)
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self.assert_warning(
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UserWarning, Image._apply_env_variables, {"PILLOW_BLOCK_SIZE": "1024"}
)
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self.assert_warning(
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UserWarning, Image._apply_env_variables, {"PILLOW_BLOCKS_MAX": "wat"}
)