[PP] Add pipeline parallelism (#5724)

python/sglang/bench_one_batch.py

@@ -154,6 +154,8 @@ def load_model(server_args, port_args, tp_rank):
         gpu_id=tp_rank,
         tp_rank=tp_rank,
         tp_size=server_args.tp_size,
+        pp_rank=0,
+        pp_size=1,
         nccl_port=port_args.nccl_port,
         server_args=server_args,
     )