Intel® Advisor

Run a Roofline Analysis

Intel Advisor offers Vectorization Advisor, a vectorization optimization tool, and Threading Advisor, a threading design and prototyping tool, to help ensure your Fortran, C and C++ applications realize full performance potential on modern processors, such as Intel® Xeon Phi™ processors. This topic is part of a tutorial that shows how to use the automated Roofline chart to make prioritized optimization decisions.

Roofline Use Case

Intel Advisor offers Vectorization Advisor, a vectorization optimization tool, and Threading Advisor, a threading design and prototyping tool, to help ensure your Fortran, C and C++ applications realize full performance potential on modern processors, such as Intel® Xeon Phi™ processors. This topic is part of a tutorial that shows how to use the automated Roofline chart to make prioritized optimization decisions.

Standalone GUI: Prepare the Sample Application

Intel Advisor offers Vectorization Advisor, a vectorization optimization tool, and Threading Advisor, a threading design and prototyping tool, to help ensure your Fortran, C and C++ applications realize full performance potential on modern processors, such as Intel® Xeon Phi™ processors. This topic is part of a tutorial that shows how to use the automated Roofline chart to make prioritized optimization decisions.

Visual Studio* IDE: Prepare the Sample Application

Intel Advisor offers Vectorization Advisor, a vectorization optimization tool, and Threading Advisor, a threading design and prototyping tool, to help ensure your Fortran, C and C++ applications realize full performance potential on modern processors, such as Intel® Xeon Phi™ processors. This topic is part of a tutorial that shows how to use the automated Roofline chart to make prioritized optimization decisions.

Address Memory Bandwidth Bottlenecks

Intel Advisor offers Vectorization Advisor, a vectorization optimization tool, and Threading Advisor, a threading design and prototyping tool, to help ensure your Fortran, C and C++ applications realize full performance potential on modern processors, such as Intel® Xeon Phi™ processors. This topic is part of a tutorial that shows how to use the automated Roofline chart to make prioritized optimization decisions.

Address Compute Capacity Bottlenecks

Intel Advisor offers Vectorization Advisor, a vectorization optimization tool, and Threading Advisor, a threading design and prototyping tool, to help ensure your Fortran, C and C++ applications realize full performance potential on modern processors, such as Intel® Xeon Phi™ processors. This topic is part of a tutorial that shows how to use the automated Roofline chart to make prioritized optimization decisions.

Identify the Real Bottlenecks

Intel Advisor offers Vectorization Advisor, a vectorization optimization tool, and Threading Advisor, a threading design and prototyping tool, to help ensure your Fortran, C and C++ applications realize full performance potential on modern processors, such as Intel® Xeon Phi™ processors. This topic is part of a tutorial that shows how to use the automated Roofline chart to make prioritized optimization decisions.

Summary

Intel Advisor offers Vectorization Advisor, a vectorization optimization tool, and Threading Advisor, a threading design and prototyping tool, to help ensure your Fortran, C and C++ applications realize full performance potential on modern processors, such as Intel® Xeon Phi™ processors. This topic is part of a tutorial that shows how to use the automated Roofline chart to make prioritized optimization decisions.

Roofline gives me a much higher performance then expected

Good morning,

I'm working on code optimisation. I run on  Broadwell E5-2650v4 CPUs Linux machines. I optimised the code so roofline model shows 284.38 GFLOPS of perfomance versus 35.94 GFLOPS of the previous version of optimisation. It is 7.9 times higher. However, elapsed time is only around 2 times difference. I'm not sure it is the sort of difference I should expect...I would expect that roofline model also shows me 2 times difference in performance...What there could be wrong?

I'm attaching two screenshots of roofline models built with Intel Advisor. 

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