Resolves the `404 Not Found` error when running `compile_deep_gemm.py` in multi-node setups (#5720)

python/sglang/compile_deep_gemm.py

@@ -88,8 +88,36 @@ def launch_server_process_and_send_one_request(
             headers = {
                 "Content-Type": "application/json; charset=utf-8",
             }
+            if server_args.node_rank == 0:
                 response = requests.get(f"{base_url}/v1/models", headers=headers)
+            else:
+                # This http api is created by launch_dummy_health_check_server for none-rank0 node.
+                response = requests.get(f"{base_url}/health", headers=headers)
             if response.status_code == 200:
+                # Rank-0 node send a request to sync with other node and then return.
+                if server_args.node_rank == 0:
+                    response = requests.post(
+                        f"{base_url}/generate",
+                        json={
+                            "input_ids": [0, 1, 2, 3],
+                            "sampling_params": {
+                                "max_new_tokens": 8,
+                                "temperature": 0,
+                            },
+                        },
+                        timeout=600,
+                    )
+                    if response.status_code != 200:
+                        error = response.json()
+                        raise RuntimeError(f"Sync request failed: {error}")
+                # Other nodes should wait for the exit signal from Rank-0 node.
+                else:
+                    start_time_waiting = time.time()
+                    while proc.is_alive():
+                        if time.time() - start_time_waiting < timeout:
+                            time.sleep(10)
+                        else:
+                            raise TimeoutError("Waiting for main node timeout!")
                 return proc
         except requests.RequestException:
             pass
@@ -122,10 +150,19 @@ def run_compile(server_args: ServerArgs, compile_args: CompileArgs):
 
     proc = launch_server_process_and_send_one_request(server_args, compile_args)
 
-    kill_process_tree(proc.pid)
-
     print("\nDeepGEMM Kernels compilation finished successfully.")
 
+    # Sleep for safety
+    time.sleep(10)
+    if proc.is_alive():
+        # This is the rank0 node.
+        kill_process_tree(proc.pid)
+    else:
+        try:
+            kill_process_tree(proc.pid)
+        except Exception:
+            pass
+
 
 if __name__ == "__main__":
     parser = argparse.ArgumentParser()