Fix memory leak when doing chunked prefill (#1787)

test/srt/run_suite.py

@@ -5,6 +5,7 @@ from sglang.test.test_utils import run_unittest_files
 
 suites = {
     "minimal": [
+        "test_radix_attention.py",
         "models/test_embedding_models.py",
         "models/test_generation_models.py",
         "models/test_lora.py",

test/srt/test_radix_attention.py

@@ -0,0 +1,112 @@
+import os
+import random
+import unittest
+
+import requests
+
+from sglang.test.test_utils import (
+    DEFAULT_MODEL_NAME_FOR_TEST,
+    DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
+    DEFAULT_URL_FOR_TEST,
+    kill_child_process,
+    popen_launch_server,
+)
+
+
+def gen_radix_tree(num_nodes=400, chunk_len=256):
+    num0 = num_nodes // 2
+    num1 = num_nodes - num0
+    nodes = [{"input_ids": [37] * 117, "decode_len": 217}]
+    for _ in range(num0):
+        parent = random.choice(nodes)
+        unique_len = random.randint(0, chunk_len)
+        decode_len = random.randint(0, chunk_len)
+        token_id = random.randint(0, 32000)
+        child = {
+            "input_ids": parent["input_ids"] + [token_id] * unique_len,
+            "decode_len": decode_len,
+        }
+        nodes.append(child)
+
+    while num1 > 0:
+        num_branch = random.randint(1, min(num1, 10))
+        parent = random.choice(nodes)
+        for _ in range(num_branch):
+            unique_len = random.randint(0, chunk_len)
+            decode_len = random.randint(0, chunk_len)
+            token_id = random.randint(0, 32000)
+            child = {
+                "input_ids": parent["input_ids"] + [token_id] * unique_len,
+                "decode_len": decode_len,
+            }
+            nodes.append(child)
+
+        num1 -= num_branch
+
+    random.shuffle(nodes)
+    return nodes
+
+
+def run_test(base_url, nodes):
+    data = {
+        "input_ids": [node["input_ids"] for node in nodes],
+        "sampling_params": [
+            {"max_new_tokens": node["decode_len"], "temperature": 0} for node in nodes
+        ],
+    }
+
+    res = requests.post(base_url + "/generate", json=data)
+    assert res.status_code == 200
+
+
+class TestRadixCacheFCFS(unittest.TestCase):
+    @classmethod
+    def setUpClass(cls):
+        cls.model = DEFAULT_MODEL_NAME_FOR_TEST
+        cls.base_url = DEFAULT_URL_FOR_TEST
+        cls.process = popen_launch_server(
+            cls.model,
+            cls.base_url,
+            timeout=DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
+            other_args=[
+                "--chunked-prefill-size",
+                "128",
+                "--max-total-tokens",
+                "20000",
+                "--schedule-policy",
+                "fcfs",
+            ],
+        )
+
+    @classmethod
+    def tearDownClass(cls):
+        kill_child_process(cls.process.pid)
+
+    def test_radix_attention(self):
+        nodes = gen_radix_tree()
+        run_test(self.base_url, nodes)
+
+
+class TestRadixCacheLPM(TestRadixCacheFCFS):
+    @classmethod
+    def setUpClass(cls):
+        cls.model = DEFAULT_MODEL_NAME_FOR_TEST
+        cls.base_url = DEFAULT_URL_FOR_TEST
+        cls.process = popen_launch_server(
+            cls.model,
+            cls.base_url,
+            timeout=DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
+            other_args=[
+                "--chunked-prefill-size",
+                "128",
+                "--max-total-tokens",
+                "20000",
+                "--schedule-policy",
+                "lpm",
+            ],
+        )
+
+
+if __name__ == "__main__":
+    os.environ["SGLANG_TEST_RETRACT"] = "true"
+    unittest.main()