Intel® Graphics Performance Analyzers User Guide

ID 767266
Date 3/15/2023
Public

A newer version of this document is available. Customers should click here to go to the newest version.

Document Table of Contents

Counter API

Counter is a user-defined characteristic or metric of hardware or software behavior that can be used to collect information about and correlate with execution breakdown, such as tasks, events, and markers. For example, it is useful for system on a chip (SoC) development when different counters may represent different parts of the SoC and count some hardware characteristics.

To define and create a counter object, use the following primitives:

__itt_counter ITTAPI __itt_counter_create_typedA __itt_counter_create_typedA(const char *name, const char *domain, __itt_metadata_type type)

__itt_counter ITTAPI __itt_counter_create_typedW __itt_counter_create_typedW(const wchar_t *name, const wchar_t *domain, __itt_metadata_type type)

Parameters of the primitives:

[in]

domain

Counter domain

[in]

name

Counter name

[in]

type

Counter type

To directly set the counter value, use the following primitive:

__itt_counter_set_value(__itt_counter id, void *value_ptr);

Parameters of the primitive:

[in]

id

Counter ID

[in]

value_ptr

Counter value

Usage Example

The following example creates a counter that measures temperature and memory usage metrics:

#include "ittnotify.h"

__itt_counter temperatureCounter = __itt_counter_create("Temperature", "Domain");
__itt_counter memoryUsageCounter = __itt_counter_create("Memory Usage", "Domain");
unsigned __int64 temperature;

while (...)
{
    ...
    temperature = getTemperature();
    __itt_counter_set_value(temperatureCounter, &temperature);

    __itt_counter_inc_delta(memoryUsageCounter, getAllocatedMemSize());
    __itt_counter_dec_delta(memoryUsageCounter, getDeallocatedMemSize());
    ...
}

__itt_counter_destroy(temperatureCounter);
__itt_counter_destroy(memoryUsageCounter);