Roofline-An-Insightful-Visual-Performance-Model

Notes

• A model to provide bound and bottleneck analysis.
• Operational Intensity = Operations per byte of DRAM traffic
• Total bytes accessed = Bytes that go to main memory after they have been filtered by caches (measures traffic between the caches and the memory instead of processor and caches).
• Operational intensity suggests the DRAM bandwidth needed by a kernel on a particular computer.
• The proposed model ties together floating-point performance, operational intensity, and memory performance together in a two dimensional graph.
• Peak floating-point performance can be found using the hardware specifications or microbenchmarks.
• Peak memory performance is defined by the memory system behind the caches. You can find it with STREAM benchmark.