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PerfModeling - Predicting Performance 1 Performance...

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Performance Modeling February 15, 2008 University of Central Florida Predicting Performance 1
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Performance Modeling February 15, 2008 University of Central Florida Where to begin? You’re done writing code, now what? Does it work? Is it fast? What does fast mean? 60x faster than the CPU is pretty good ! What are you leaving on the table? ! How close is it to theoretical? 2
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Performance Modeling February 15, 2008 University of Central Florida Predicting Performance It is very useful to predict theoretical performance when working on shaders Spreadsheets are quite useful for this ! Compute theoretical performance ! Compute pixels per clock, etc ! Easy to see how close an implementation is to peak performance Quite easy with CAL/Brook+ since you can get the ISA even if you use a high-level language 3
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Performance Modeling February 15, 2008 University of Central Florida Breaking down GPGPU performance 4
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Performance Modeling February 15, 2008 University of Central Florida Breaking down GPGPU performance GPGPU applications generally progress through the hardware in a predictable fashion, unlike rendering 4
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Performance Modeling February 15, 2008 University of Central Florida Breaking down GPGPU performance GPGPU applications generally progress through the hardware in a predictable fashion, unlike rendering 4 ALU
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Performance Modeling February 15, 2008 University of Central Florida Breaking down GPGPU performance GPGPU applications generally progress through the hardware in a predictable fashion, unlike rendering 4 ALU TEX
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Performance Modeling February 15, 2008 University of Central Florida Breaking down GPGPU performance GPGPU applications generally progress through the hardware in a predictable fashion, unlike rendering 4 ALU TEX MEM
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Performance Modeling February 15, 2008 University of Central Florida Breaking down GPGPU performance GPGPU applications generally progress through the hardware in a predictable fashion, unlike rendering 4 ALU ALU TEX MEM
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Performance Modeling February 15, 2008 University of Central Florida Breaking down GPGPU performance GPGPU applications generally progress through the hardware in a predictable fashion, unlike rendering 4 ALU ALU TEX MEM ...
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Performance Modeling February 15, 2008 University of Central Florida Breaking down GPGPU performance GPGPU applications generally progress through the hardware in a predictable fashion, unlike rendering 4 ALU ALU TEX MEM MEM ...
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Performance Modeling February 15, 2008 University of Central Florida Breaking down GPGPU performance GPGPU applications generally progress through the hardware in a predictable fashion, unlike rendering Theoretical performance can be calculated 4 ALU ALU TEX MEM MEM ...
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Performance Modeling February 15, 2008 University of Central Florida Breaking down GPGPU performance GPGPU applications generally progress through the hardware in a predictable fashion, unlike rendering Theoretical performance can be calculated What we know… 4 ALU ALU TEX MEM MEM ...
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Performance Modeling February 15, 2008 University of Central Florida Breaking down GPGPU performance
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