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import torch
import triton
import triton.language as tl
import time
@triton.jit
def copy_kernel(A, B, N, BLOCK_SIZE: tl.constexpr):
pid = tl.program_id(0)
offsets = pid * BLOCK_SIZE + tl.arange(0, BLOCK_SIZE)
mask = offsets < N
b = tl.load(B + offsets, mask=mask)
tl.store(A + offsets, b, mask=mask)
def run_high_bw():
N = 1024 * 1024 * 512 # 512M elements (1GB for BF16)
dtype = torch.bfloat16
A = torch.empty(N, device="cuda", dtype=dtype)
B = torch.randn(N, device="cuda", dtype=dtype)
grid = (triton.cdiv(N, 1024),)
torch.cuda.synchronize()
start = time.time()
for _ in range(100): copy_kernel[grid](A, B, N, BLOCK_SIZE=1024)
torch.cuda.synchronize()
bw = (2 * N * 2) / ((time.time() - start) / 100) / 1e12
print(f"H200 HBM3e COPY (BF16): {bw:.2f} TB/s")
if __name__ == "__main__":
run_high_bw()
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