Readability improvement by using device_clock alias

[oleksandr-pavlyk]

Use alias device_clock = cuda::std::chrono::high_resolution_clock; for readability improvement, and a chance for comment to state that using it in device code for timing purposes is correct and intentional.

I looked at this as a follow-up to #371, which replaced std::chrono::high_resolution_clock with std::chrono::steady_clock.

Per https://nvidia.github.io/cccl/unstable/libcudacxx/standard_api/time_library.html type cuda::std::chrono::steady_clock is not provided, and while cuda::std::chrono::high_resolution_clock is not heterogeneously steady, but is steady within device code and suitable for device-side performance measurement.

[oleksandr-pavlyk]

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📥 Commits

Reviewing files that changed from the base of the PR and between c48b318 and 02c8c82.

📒 Files selected for processing (2)

• nvbench/blocking_kernel.cu
• nvbench/test_kernels.cuh

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📝 Walkthrough

Summary by CodeRabbit

• Refactor
  • Improved the internal timing implementation used by CUDA blocking and sleep operations.
  • Preserved existing timeout behavior and loop termination logic.

Walkthrough

Device timing measurements were refactored to use device_clock aliases in the blocking stream and sleep kernels. Timeout and busy-wait conditions retain their existing behavior.

Changes

Device timing refactor

Layer / File(s)	Summary
Blocking kernel timeout timing nvbench/blocking_kernel.cu	block_stream uses a local device_clock alias for initial and iterative timestamps while retaining the existing timeout calculation and termination conditions.
Sleep kernel clock polling nvbench/test_kernels.cuh	sleep_kernel defines nvbench::device_clock and uses it to calculate the start time, finish deadline, and polling timestamps.

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