"""Unit tests for mem_cache/utils.py — no server, no model loading.""" import hashlib import unittest from unittest.mock import MagicMock, patch from sglang.srt.mem_cache.evict_policy import ( FIFOStrategy, FILOStrategy, LFUStrategy, LRUStrategy, MRUStrategy, PriorityStrategy, SLRUStrategy, ) from sglang.srt.mem_cache.utils import ( compute_node_hash_values, get_eviction_strategy, get_hash_str, hash_str_to_int64, maybe_init_custom_mem_pool, split_node_hash_value, ) from sglang.test.ci.ci_register import register_cpu_ci from sglang.test.test_utils import CustomTestCase register_cpu_ci(est_time=8, suite="base-a-test-cpu") class TestGetEvictionStrategy(CustomTestCase): def test_lru(self): self.assertIsInstance(get_eviction_strategy("lru"), LRUStrategy) def test_lfu(self): self.assertIsInstance(get_eviction_strategy("lfu"), LFUStrategy) def test_fifo(self): self.assertIsInstance(get_eviction_strategy("fifo"), FIFOStrategy) def test_mru(self): self.assertIsInstance(get_eviction_strategy("mru"), MRUStrategy) def test_filo(self): self.assertIsInstance(get_eviction_strategy("filo"), FILOStrategy) def test_priority(self): self.assertIsInstance(get_eviction_strategy("priority"), PriorityStrategy) def test_slru(self): self.assertIsInstance(get_eviction_strategy("slru"), SLRUStrategy) def test_case_insensitive(self): self.assertIsInstance(get_eviction_strategy("LRU"), LRUStrategy) self.assertIsInstance(get_eviction_strategy("Lru"), LRUStrategy) self.assertIsInstance(get_eviction_strategy("FIFO"), FIFOStrategy) def test_unknown_policy_raises_valueerror(self): with self.assertRaises(ValueError) as ctx: get_eviction_strategy("nonexistent") msg = str(ctx.exception) self.assertIn("Unknown eviction policy", msg) self.assertIn("lru", msg) self.assertIn("lfu", msg) self.assertIn("fifo", msg) self.assertIn("mru", msg) self.assertIn("filo", msg) self.assertIn("priority", msg) self.assertIn("slru", msg) def test_each_call_creates_new_instance(self): s1 = get_eviction_strategy("lru") s2 = get_eviction_strategy("lru") self.assertIsNot(s1, s2) class TestMaybeInitCustomMemPool(CustomTestCase): @patch("sglang.srt.mem_cache.utils.envs.SGLANG_MOONCAKE_CUSTOM_MEM_POOL.get") def test_disabled_by_default(self, mock_env_get): mock_env_get.return_value = None enabled, pool, pool_type = maybe_init_custom_mem_pool("cuda:0") self.assertFalse(enabled) self.assertIsNone(pool) self.assertIsNone(pool_type) @patch("sglang.srt.mem_cache.utils.envs.SGLANG_MOONCAKE_CUSTOM_MEM_POOL.get") @patch("sglang.srt.disaggregation.mooncake.utils.init_mooncake_custom_mem_pool") def test_enabled_via_env(self, mock_init, mock_env_get): mock_env_get.return_value = "enabled" mock_init.return_value = (True, "mock_pool_instance", "mooncake") enabled, pool, pool_type = maybe_init_custom_mem_pool("cuda:0") self.assertTrue(enabled) self.assertEqual(pool, "mock_pool_instance") self.assertEqual(pool_type, "mooncake") mock_init.assert_called_once_with("cuda:0") class TestGetHashStr(CustomTestCase): def test_empty_list(self): result = get_hash_str([]) self.assertIsInstance(result, str) self.assertEqual(len(result), 64) expected = hashlib.sha256().hexdigest() self.assertEqual(result, expected) def test_different_sequence_different_hash(self): h1 = get_hash_str([1, 2, 3]) h2 = get_hash_str([3, 2, 1]) self.assertNotEqual(h1, h2) def test_different_values_different_hash(self): h1 = get_hash_str([100]) h2 = get_hash_str([200]) self.assertNotEqual(h1, h2) def test_bigram_vs_flat_token_equivalent(self): h_flat = get_hash_str([1, 2]) h_bigram = get_hash_str([(1, 2)]) self.assertEqual(h_flat, h_bigram) def test_bigram_order_matters(self): h1 = get_hash_str([(1, 2)]) h2 = get_hash_str([(2, 1)]) self.assertNotEqual(h1, h2) def test_prior_hash_chaining(self): chained = get_hash_str([3, 4], prior_hash=get_hash_str([1, 2])) # prior_hash must fold into the digest, so chaining differs from # hashing [3, 4] alone... self.assertNotEqual(chained, get_hash_str([3, 4])) # ...and a different prior_hash must yield a different chained digest. self.assertNotEqual( chained, get_hash_str([3, 4], prior_hash=get_hash_str([9, 9])) ) def test_prior_hash_single_step(self): step1 = get_hash_str([1]) step2 = get_hash_str([2], prior_hash=step1) direct = get_hash_str([1, 2]) self.assertNotEqual(step2, direct) def test_returns_64_char_hex(self): for tokens in [[], [1], [1, 2, 3], [(1, 2)], [1, 2, 3, 4, 5]]: result = get_hash_str(tokens) self.assertRegex(result, r"^[0-9a-f]{64}$") class TestHashStrToInt64(CustomTestCase): def test_zero_hash(self): result = hash_str_to_int64("0" * 64) self.assertEqual(result, 0) def test_small_positive_value(self): result = hash_str_to_int64("0000000000000001" + "0" * 48) self.assertEqual(result, 1) def test_large_positive_value(self): result = hash_str_to_int64("7fffffffffffffff" + "0" * 48) self.assertEqual(result, 2**63 - 1) def test_negative_overflow(self): result = hash_str_to_int64("8000000000000000" + "0" * 48) self.assertEqual(result, -(2**63)) def test_max_unsigned_maps_to_minus_one(self): result = hash_str_to_int64("f" * 16 + "0" * 48) self.assertEqual(result, -1) def test_only_first_16_chars_matter(self): h1 = hash_str_to_int64("a" * 16 + "0" * 48) h2 = hash_str_to_int64("a" * 16 + "f" * 48) self.assertEqual(h1, h2) def test_roundtrip_with_get_hash_str(self): hash_hex = get_hash_str([42, 99]) int64_val = hash_str_to_int64(hash_hex) self.assertIsInstance(int64_val, int) self.assertTrue(-(2**63) <= int64_val < 2**63) class TestComputeNodeHashValues(CustomTestCase): def setUp(self): def mock_hash_page(start, end, parent_hash): parts = [f"p{start}-{end}"] if parent_hash is not None: parts.append(parent_hash) return "-".join(parts) self.mock_hash_page = mock_hash_page def _make_node(self, key_len, parent=None, parent_hash_values=None): node = MagicMock() node.key.__len__.return_value = key_len node.key.hash_page = self.mock_hash_page node.parent = parent if parent is not None: parent.hash_value = parent_hash_values return node def test_single_page_root(self): node = self._make_node(key_len=3) result = compute_node_hash_values(node, page_size=16) self.assertEqual(len(result), 1) self.assertIn("p0-3", result[0]) def test_multiple_pages(self): node = self._make_node(key_len=30) result = compute_node_hash_values(node, page_size=16) self.assertEqual(len(result), 2) self.assertIn("p0-16", result[0]) self.assertIn("p16-30", result[1]) def test_page_aligned_boundary(self): node = self._make_node(key_len=32) result = compute_node_hash_values(node, page_size=8) self.assertEqual(len(result), 4) self.assertIn("p24-32", result[3]) def test_key_shorter_than_page_size(self): node = self._make_node(key_len=5) result = compute_node_hash_values(node, page_size=16) self.assertEqual(result, ["p0-5"]) def test_chained_parent_hash(self): parent = MagicMock() parent.key.__len__.return_value = 8 parent.hash_value = ["parent_hash_0", "parent_hash_1"] parent.key.hash_page = self.mock_hash_page child = self._make_node( key_len=16, parent=parent, parent_hash_values=parent.hash_value ) result = compute_node_hash_values(child, page_size=8) self.assertEqual(result, ["p0-8-parent_hash_1", "p8-16-p0-8-parent_hash_1"]) def test_parent_with_empty_key(self): parent = MagicMock() parent.key.__len__.return_value = 0 parent.hash_value = ["some_hash"] parent.key.hash_page = self.mock_hash_page child = self._make_node( key_len=8, parent=parent, parent_hash_values=parent.hash_value ) result = compute_node_hash_values(child, page_size=8) self.assertEqual(len(result), 1) self.assertNotIn("some_hash", result[0]) def test_parent_without_hash_value(self): parent = MagicMock() parent.key.__len__.return_value = 8 parent.hash_value = [] parent.key.hash_page = self.mock_hash_page child = self._make_node(key_len=8, parent=parent, parent_hash_values=[]) result = compute_node_hash_values(child, page_size=8) self.assertEqual(result, ["p0-8"]) def test_parent_with_none_hash_value(self): parent = MagicMock() parent.key.__len__.return_value = 8 parent.hash_value = None parent.key.hash_page = self.mock_hash_page child = self._make_node(key_len=8, parent=parent, parent_hash_values=None) result = compute_node_hash_values(child, page_size=8) self.assertEqual(result, ["p0-8"]) class TestSplitNodeHashValue(CustomTestCase): def test_none_input_returns_none_tuple(self): result = split_node_hash_value(None, 10, 4) self.assertEqual(result, (None, None)) def test_page_size_one_split(self): hash_values = [f"hash_{i}" for i in range(4)] new_hash, child_hash = split_node_hash_value(hash_values, 2, 1) self.assertEqual(new_hash, ["hash_0", "hash_1"]) self.assertEqual(child_hash, ["hash_2", "hash_3"]) def test_page_size_one_split_at_zero(self): hash_values = ["a", "b", "c"] new_hash, child_hash = split_node_hash_value(hash_values, 0, 1) self.assertEqual(new_hash, []) self.assertEqual(child_hash, ["a", "b", "c"]) def test_page_size_one_split_at_len(self): hash_values = ["a", "b", "c"] new_hash, child_hash = split_node_hash_value(hash_values, 3, 1) self.assertEqual(new_hash, ["a", "b", "c"]) self.assertEqual(child_hash, []) def test_page_size_larger_than_one(self): hash_values = ["p0", "p1", "p2", "p3", "p4", "p5"] new_hash, child_hash = split_node_hash_value(hash_values, 4, 2) self.assertEqual(new_hash, ["p0", "p1"]) self.assertEqual(child_hash, ["p2", "p3", "p4", "p5"]) def test_page_size_split_exact_page_boundary(self): hash_values = ["a", "b", "c", "d"] new_hash, child_hash = split_node_hash_value(hash_values, 4, 4) self.assertEqual(new_hash, ["a"]) self.assertEqual(child_hash, ["b", "c", "d"]) def test_page_size_split_within_page(self): hash_values = ["a", "b", "c"] new_hash, child_hash = split_node_hash_value(hash_values, 6, 4) self.assertEqual(new_hash, ["a"]) self.assertEqual(child_hash, ["b", "c"]) def test_total_length_preserved(self): hash_values = [f"h_{i}" for i in range(10)] for split_len in [0, 1, 3, 5, 7, 9, 10]: for page_size in [1, 2, 4]: new_hash, child_hash = split_node_hash_value( hash_values, split_len, page_size ) self.assertEqual( len(new_hash) + len(child_hash), len(hash_values), f"split_len={split_len}, page_size={page_size}", ) if __name__ == "__main__": unittest.main()