Intel® Advisor User Guide

User Guide

Contents

assume-hide-taxes

Estimate invocation taxes assuming the invocation tax is paid only for the first kernel launch.
GUI Equivalent
Analysis Properties
Offload Modeling
Performance Modeling
Single Kernel Launch Tax

Syntax

--assume-hide-taxes
--no-assume-hide-taxes
Default
Off (no-assume-hide-taxes)
Actions Modified
collect
=projection
Usage
You can control how to model kernel invocation taxes for your application. When a high call count value is detected for a potentially profitable code region,
Intel® Advisor
 assumes that the kernel invocation tax is paid as many times as the kernel is launched. This results in high invocation tax and cost of offloading, which means that this code region cannot benefit from offloading.
For simple applications where there is no need to wait for a kernel instance to finish, use the
assume-hide-taxes
 to hide this cost every time except the very first one and minimize the invocation tax.
Example
  1. Run Survey Analysis.
  2. Run Trip Counts and FLOP analyses of the Characterization stage.
  3. Model your application performance on a target device assuming the invocation tax is paid only when the kernel is launched for the first time. 
$ advisor --collect=survey -stackwalk-mode=online --static-instruction-mix --project-dir=./advi -- myApplication

$ advisor --collect=tripcounts --flop --enable-data-transfer-analysis --project-dir=./advi -- myApplication
$ advisor --collect=projection --assume-hide-taxes --project-dir=./advi

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.