[Test] Add flashmla attention backend test

test/srt/test_flash_mla_attention_backend.py

@@ -0,0 +1,92 @@
+"""
+Usage:
+python3 -m unittest test_flash_mla_attention_backend.TestFlashMLAAttnBackend.test_mmlu
+"""
+
+import unittest
+from types import SimpleNamespace
+
+from sglang.srt.utils import kill_process_tree
+from sglang.test.run_eval import run_eval
+from sglang.test.test_utils import (
+    DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
+    DEFAULT_URL_FOR_TEST,
+    is_in_ci,
+    popen_launch_server,
+    run_bench_one_batch,
+)
+
+# Use DeepSeek V3 model for testing
+DSV3_MODEL_FOR_TEST = "deepseek-ai/DeepSeek-V2-Lite"
+
+
+class TestFlashMLAAttnBackend(unittest.TestCase):
+    def test_latency(self):
+        output_throughput = run_bench_one_batch(
+            DSV3_MODEL_FOR_TEST,
+            [
+                "--attention-backend",
+                "flashinfer",
+                "--enable-torch-compile",
+                "--cuda-graph-max-bs",
+                "16",
+                "--trust-remote-code",
+            ],
+        )
+
+        if is_in_ci():
+            self.assertGreater(output_throughput, 153)
+
+    def test_mmlu(self):
+        model = DSV3_MODEL_FOR_TEST
+        base_url = DEFAULT_URL_FOR_TEST
+        process = popen_launch_server(
+            model,
+            base_url,
+            timeout=DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
+            other_args=["--attention-backend", "flashmla", "--trust-remote-code"],
+        )
+
+        try:
+            args = SimpleNamespace(
+                base_url=base_url,
+                model=model,
+                eval_name="mmlu",
+                num_examples=64,
+                num_threads=32,
+            )
+
+            metrics = run_eval(args)
+            self.assertGreaterEqual(metrics["score"], 0.2)
+        finally:
+            kill_process_tree(process.pid)
+
+    def test_gsm8k(self):
+        model = DSV3_MODEL_FOR_TEST
+        base_url = DEFAULT_URL_FOR_TEST
+        process = popen_launch_server(
+            model,
+            base_url,
+            timeout=DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
+            other_args=["--attention-backend", "flashmla", "--trust-remote-code"],
+        )
+
+        try:
+            args = SimpleNamespace(
+                base_url=base_url,
+                model=model,
+                eval_name="gsm8k",
+                num_examples=64,
+                num_threads=32,
+            )
+
+            metrics = run_eval(args)
+            self.assertGreaterEqual(
+                metrics["score"], 0.97
+            )  # Higher threshold based on DSV3 GSM8K score from PR
+        finally:
+            kill_process_tree(process.pid)
+
+
+if __name__ == "__main__":
+    unittest.main()