Configuring Your Build System

Including the ITT API Header or Module in Your Application

For C/C++ Applications

Add the following #include statements to every source file that you want to instrument:

#include <ittnotify.h>

The ittnotify.h header contains definitions of ITT API routines and important macros which provide the correct logic of API invocation from a user application.

The ITT API is designed to incur almost zero overhead when tracing is disabled. But if you need fully zero overhead, you can compile out all ITT API calls from your application by defining the INTEL_NO_ITTNOTIFY_API macro in your project at compile time, either on the compiler command line, or in your source file, prior to including the ittnotify.h file.

For Fortran Applications

Add the ITTNOTIFY module to your source files with the following source line:

USE ITTNOTIFY

Insert ITT Notifications in Your Application

Insert __itt_* (C/C++) or ITT_* (Fortran) notifications in your source code.

C/C++ example:

__itt_pause();

Fortran example:

CALL ITT_PAUSE()

For more information, see Instrumenting Your Application.

Linking the libittnotify.a Static Library to Your Application

You need to link the static library, libittnotify.a, to your application. If tracing is enabled, this static library loads the ITT API implementation and forwards ITT API instrumentation data to VTune Amplifier .

If tracing is disabled, the static library ignores ITT API calls, providing nearly zero instrumentation overhead.