[Inference] Benchmarking rotary embedding and add a fetch function (#5277)

* fix bugs and add a cos/sin cache fetch func

* add docstring

* fix bug

* fix

tests/test_infer_ops/triton/test_rotary_embdding_unpad.py

@@ -1,9 +1,20 @@
 import pytest
 import torch
+from packaging import version
 from transformers.models.llama.modeling_llama import LlamaRotaryEmbedding, apply_rotary_pos_emb
 
 from colossalai.kernel.triton import rotary_embedding
 
+try:
+    import triton  # noqa
+
+    HAS_TRITON = True
+except ImportError:
+    HAS_TRITON = False
+    print("please install triton from https://github.com/openai/triton")
+
+TRITON_CUDA_SUPPORT = version.parse(torch.version.cuda) > version.parse("11.4")
+
 
 def torch_rotary_emb(x, cos, sin):
     seq_len, h, dim = x.shape
@@ -52,5 +63,52 @@ def test_rotary_emb(BATCH_SIZE, SEQ_LEN, H, D, dtype):
     assert torch.allclose(k, k_ref, atol=1e-4, rtol=1e-4)
 
 
+BATCH = 16
+configs = [
+    triton.testing.Benchmark(
+        x_names=["num_tokens"],
+        x_vals=[2**i for i in range(4, 11)],
+        line_arg="provider",
+        line_vals=["torch_rotary_emb_func", "triton_rotary_emb_func"],
+        line_names=["torch_rotary_emb_func", "triton_rotary_emb_func"],
+        styles=[("red", "-"), ("blue", "-")],
+        ylabel="ms",
+        plot_name=f"rotary_emb-batch-{BATCH}",
+        args={"num_kv_heads": 16},
+    )
+]
+
+
+@triton.testing.perf_report(configs)
+def benchmark_rotary_emb(
+    provider: str,
+    num_tokens: int,
+    num_kv_heads: int,
+):
+    warmup = 10
+    rep = 100
+
+    head_dim = 128
+    dtype = torch.float16
+    q_shape = (num_tokens, num_kv_heads, head_dim)
+    q = -2.3 + 0.5 * torch.randn(q_shape, dtype=dtype, device="cuda")
+    k_shape = (num_tokens, num_kv_heads, head_dim)
+    k = -2.3 + 0.5 * torch.randn(k_shape, dtype=dtype, device="cuda")
+    cos_shape = (num_tokens, head_dim // 2)
+    cos = -1.2 + 0.5 * torch.randn(cos_shape, dtype=dtype, device="cuda")
+    sin = -2.0 + 0.5 * torch.randn(cos_shape, dtype=dtype, device="cuda")
+
+    if provider == "torch_rotary_emb_func":
+        fn = lambda: torch_rotary_emb(q, cos, sin)
+    elif provider == "triton_rotary_emb_func":
+        fn = lambda: rotary_embedding(q, k, cos, sin)
+    else:
+        raise ValueError("Undefined provider")
+
+    ms = triton.testing.do_bench(fn, warmup=warmup, rep=rep)
+    return ms
+
+
 if __name__ == "__main__":
     test_rotary_emb(4, 64, 32, 64, torch.float32)
+    # benchmark_rotary_emb.run(save_path=".",print_data=True)