Extend cuda graph capture bs for B200 (#6937)

python/sglang/srt/model_executor/cuda_graph_runner.py

@@ -139,6 +139,8 @@ def get_batch_sizes_to_capture(model_runner: ModelRunner):
         gpu_mem = get_device_memory_capacity()
         if gpu_mem is not None and gpu_mem > 96 * 1024:
             capture_bs += list(range(160, 257, 8))
+        if gpu_mem is not None and gpu_mem > 180 * 1000:
+            capture_bs += list(range(256, 513, 16))
 
     if max(capture_bs) > model_runner.req_to_token_pool.size:
         # In some cases (e.g., with a small GPU or --max-running-requests), the #max-running-requests