[ROCm] Fix some kernels failed unit tests (#2498)

tests/kernels/test_cache.py

@@ -6,6 +6,7 @@ import torch
 from typing import Tuple
 
 from vllm._C import cache_ops
+from vllm.utils import is_hip
 
 COPYING_DIRECTION = [('cuda', 'cpu'), ('cuda', 'cuda'), ('cpu', 'cuda')]
 DTYPES = [torch.half, torch.bfloat16, torch.float]
@@ -14,7 +15,10 @@ NUM_LAYERS = [1]  # Arbitrary values for testing
 NUM_HEADS = [8]  # Arbitrary values for testing
 HEAD_SIZES = [64, 80, 96, 112, 128, 256]
 BLOCK_SIZES = [8, 16, 32]
-NUM_BLOCKS = [1024, 3600]  # Arbitrary values for testing
+# reduce the size for ROCm test to avoid HIP OOM
+NUM_BLOCKS = [1024, 36000] if not is_hip else [
+    1024, 10000
+]  # Arbitrary values for testing
 NUM_MAPPINGS = [256]  # Arbitrary values for testing
 SEEDS = [0]
 CUDA_DEVICES = [