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我浏览了第10页)。
Generally speaking, the purpose of having multiple warps is that while one thread waits for an instruction to finish executing, another thread may be ready to execute without waiting. So it is likely that a warp will yield when a long-latency instruction such as a global load or a slow floating-point operation is executed. Some architectures, such as Fermi, execute multiple warps at the same time ( http://www.nvidia.com/content/PDF/fermi_white_papers/NVIDIA_Fermi_Compute_Architecture_Whitepaper.pdf page 10).
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