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One key distinction between SIMT and SIMD is that the SIMD unit will not have its own memory.
Another key distinction in SIMT is the presence of control flow mechanisms like warps ([[Nvidia]] terminology) or wavefronts (Advanced Micro Devices ([[AMD]]) terminology). [[ILLIAC IV]] simply called them "Control Signals". These signals ensure that each Processing Element in the entire parallel array is synchronized in its simultaneous execution of the (one, current)
Each hardware element (PU, or PE in [[ILLIAC IV]] terminology) working on individual data item sometimes also referred to as a [[SIMD lane]] or channel, although the ILLIAC IV PE was a scalar 64-bit unit. Modern [[graphics processing unit]]s (GPUs) are invariably wide [[SIMD within a register]] (SWAR) and typically have more that 16 data lanes or channels of such Processing Elements.{{cn|date=July 2024}} Some newer GPUs integrate mixed-precision {{cn|date=July 2025}} SWAR pipelines, which performs concurrent sub-word [[8-bit computing|8-bit]], [[16-bit computing|16-bit]], and [[32-bit computing|32-bit]] operations. This is critical for applications like AI inference, where mixed precision boosts throughput.
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