What are the differences among Compute (SM) Throughput, Memory Throughput, and DRAM Throughput in GPU Speed Of Light Throughput in nsight compute？

Developer Tools Nsight Compute
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The key question is what the source and destination are for each throughput metric? What is the Compute Memory Pipeline Throughput？

Reference:

  1. Compute (SM) Throughput：sm__throughput，SM throughput assuming ideal load balancing across SMSPs (This throughput metric represents the percent of the peak sustained rate achieved during elapsed cycles across all unit instances)
  2. Memory Throughput：gpu_compute_memory__throughputCompute Memory Pipeline Throughput (This throughput metric represents the percent of the peak sustained rate achieved during elapsed cycles across all unit instances)
  3. DRAM Throughput：gpu_dram__throughput，GPU DRAM throughput (This throughput metric represents the percent of the peak sustained rate achieved during elapsed cycles across all unit instances)
  4. DRAM throughput metrics