Refactor and fix prefill delayer (scheduler enhancer) (#16269)

2026-01-04 07:15:06 +08:00
parent 7bc13c906c
commit 2337b1bbb0
6 changed files with 172 additions and 79 deletions
@@ -188,6 +188,7 @@ suites = {
        TestFile("test_profile_v2.py"),
        TestFile("models/test_ministral3_models.py"),
        TestFile("test_mistral_large3_basic.py"),
+        TestFile("test_prefill_delayer.py"),
    ],
 }

@@ -0,0 +1,76 @@
+import os
+import unittest
+
+from sglang.bench_serving import run_benchmark
+from sglang.srt.environ import envs
+from sglang.srt.utils import kill_process_tree
+from sglang.test.test_utils import (
+    DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
+    DEFAULT_URL_FOR_TEST,
+    CustomTestCase,
+    get_benchmark_args,
+    popen_launch_server,
+)
+
+
+class TestPrefillDelayerThroughput(CustomTestCase):
+    def _run_throughput_test(self, with_prefill_delayer: bool):
+        os.environ["SGLANG_PREFILL_DELAYER_DEBUG_LOG"] = "1"
+
+        model = "Qwen/Qwen3-0.6B"
+        base_url = DEFAULT_URL_FOR_TEST
+        other_args = [
+            "--trust-remote-code",
+            "--tp",
+            "8",
+            "--enable-dp-attention",
+            "--dp",
+            "8",
+            "--chunked-prefill-size",
+            "262144",
+            "--mem-fraction-static",
+            "0.6",
+        ]
+
+        # TODO further fix mem leak
+        with envs.SGLANG_SCHEDULER_DECREASE_PREFILL_IDLE.override(
+            with_prefill_delayer
+        ), envs.SGLANG_PREFILL_DELAYER_MAX_DELAY_PASSES.override(
+            100
+        ), envs.SGLANG_ENABLE_STRICT_MEM_CHECK_DURING_IDLE.override(
+            False
+        ):
+            process = popen_launch_server(
+                model,
+                base_url,
+                timeout=DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
+                other_args=other_args,
+            )
+
+        try:
+            args = get_benchmark_args(
+                base_url=base_url,
+                dataset_name="random",
+                num_prompts=500,
+                random_input_len=30000,
+                random_output_len=256,
+                request_rate=32,
+                tokenizer=model,
+            )
+            res = run_benchmark(args)
+        finally:
+            kill_process_tree(process.pid)
+
+        print(f"=== {with_prefill_delayer=} ===")
+        print(f"Input throughput: {res['input_throughput']:.2f} token/s")
+        print(f"Output throughput: {res['output_throughput']:.2f} token/s")
+
+    def test_1_dp_attention_throughput_with_prefill_delayer(self):
+        self._run_throughput_test(with_prefill_delayer=True)
+
+    def test_2_dp_attention_throughput_without_prefill_delayer(self):
+        self._run_throughput_test(with_prefill_delayer=False)
+
+
+if __name__ == "__main__":
+    unittest.main()