docs/articles_en/openvino-workflow/running-inference/inference-devices-and-modes/query-device-properties.rst
.. meta:: :description: Learn the details on the process of querying different device properties and configuration values at runtime.
This article provides an overview of how to query different device properties and configuration values at runtime.
OpenVINO runtime has two types of properties:
ov::CompiledModel.ov::Core::compile_model
process and affect final inference on a specific set of devices. Such properties
can be set globally per device via ov::Core::set_property or locally for a
particular model in the ov::Core::compile_model and ov::Core::query_model
calls.An OpenVINO property is represented as a named constexpr variable with a given string
name and a type. The following example represents a read-only property with the C++ name
of ov::available_devices, the string name of AVAILABLE_DEVICES and the type of
std::vector<std::string>:
.. code-block:: sh
static constexpr Property<std::vectorstd::string, PropertyMutability::RO> available_devices{"AVAILABLE_DEVICES"};
Refer to the :doc:Hello Query Device C++ Sample <../../../get-started/learn-openvino/openvino-samples/hello-query-device>
sources for an example of using the setting and getting properties in user applications.
Get a Set of Available Devices ###########################################################
Based on the ov::available_devices read-only property, OpenVINO Core collects information about currently available
devices enabled by OpenVINO plugins and returns information, using the ov::Core::get_available_devices method:
.. tab-set::
.. tab-item:: Python :sync: py
.. doxygensnippet:: docs/articles_en/assets/snippets/ov_properties_api.py
:language: py
:fragment: [get_available_devices]
.. tab-item:: C++ :sync: cpp
.. doxygensnippet:: docs/articles_en/assets/snippets/ov_properties_api.cpp
:language: cpp
:fragment: [get_available_devices]
The function returns a list of available devices, for example:
.. code-block:: sh
CPU GPU.0 GPU.1
If there are multiple instances of a specific device, the devices are enumerated with a suffix comprising a full stop and
a unique string identifier, such as .suffix. Each device name can then be passed to:
ov::Core::compile_model to load the model to a specific device with specific configuration properties.ov::Core::get_property to get common or device-specific properties.ov::Core class that accept deviceName.Working with Properties in Your Code ###########################################################
The ov::Core class provides the following method to query device information, set or get different device configuration properties:
ov::Core::get_property - Gets the current value of a specific property.ov::Core::set_property - Sets a new value for the property globally for specified device_name.The ov::CompiledModel class is also extended to support the properties:
ov::CompiledModel::get_propertyov::CompiledModel::set_propertyFor documentation about OpenVINO common device-independent properties, refer to
properties.hpp (GitHub) <https://github.com/openvinotoolkit/openvino/blob/releases/2026/0/src/inference/include/openvino/runtime/properties.hpp>__.
Device-specific configuration keys can be found in a corresponding device folders,
for example, openvino/runtime/intel_gpu/properties.hpp.
Working with Properties via Core ###########################################################
Getting Device Properties +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
The code below demonstrates how to query HETERO device priority of devices which will be used to infer the model:
.. tab-set::
.. tab-item:: Python :sync: py
.. doxygensnippet:: docs/articles_en/assets/snippets/ov_properties_api.py
:language: py
:fragment: [hetero_priorities]
.. tab-item:: C++ :sync: cpp
.. doxygensnippet:: docs/articles_en/assets/snippets/ov_properties_api.cpp
:language: cpp
:fragment: [hetero_priorities]
.. note::
All properties have a type, which is specified during property declaration. Based on this, actual type under auto is automatically deduced by C++ compiler.
To extract device properties such as available devices (ov::available_devices), device name (ov::device::full_name),
supported properties (ov::supported_properties), and others, use the ov::Core::get_property method:
.. tab-set::
.. tab-item:: Python :sync: py
.. doxygensnippet:: docs/articles_en/assets/snippets/ov_properties_api.py
:language: py
:fragment: [cpu_device_name]
.. tab-item:: C++ :sync: cpp
.. doxygensnippet:: docs/articles_en/assets/snippets/ov_properties_api.cpp
:language: cpp
:fragment: [cpu_device_name]
A returned value appears as follows: Intel(R) Core(TM) i7-8700 CPU @ 3.20GHz.
.. note::
In order to understand a list of supported properties on ov::Core or ov::CompiledModel levels, use ov::supported_properties
which contains a vector of supported property names. Properties which can be changed, has ov::PropertyName::is_mutable
returning the true value. Most of the properties which are changeable on ov::Core level, cannot be changed once the model is compiled,
so it becomes immutable read-only property.
Configure a Work with a Model +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
The ov::Core methods like:
ov::Core::compile_modelov::Core::import_modelov::Core::query_modelaccept a selection of properties as last arguments. Each of the properties should be used as a function call to pass a property value with a specified property type.
.. tab-set::
.. tab-item:: Python :sync: py
.. doxygensnippet:: docs/articles_en/assets/snippets/ov_properties_api.py
:language: py
:fragment: [compile_model_with_property]
.. tab-item:: C++ :sync: cpp
.. doxygensnippet:: docs/articles_en/assets/snippets/ov_properties_api.cpp
:language: cpp
:fragment: [compile_model_with_property]
The example below specifies hints that a model should be compiled to be inferred with multiple inference requests in parallel to achieve best throughput, while inference should be performed without accuracy loss with FP32 precision.
Setting Properties Globally +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
ov::Core::set_property with a given device name should be used to set global configuration properties,
which are the same across multiple ov::Core::compile_model, ov::Core::query_model, and other calls.
However, setting properties on a specific ov::Core::compile_model call applies properties only for the current call:
.. tab-set::
.. tab-item:: Python :sync: py
.. doxygensnippet:: docs/articles_en/assets/snippets/ov_properties_api.py
:language: py
:fragment: [core_set_property_then_compile]
.. tab-item:: C++ :sync: cpp
.. doxygensnippet:: docs/articles_en/assets/snippets/ov_properties_api.cpp
:language: cpp
:fragment: [core_set_property_then_compile]
Properties on CompiledModel Level ###########################################################
Getting Property +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
The ov::CompiledModel::get_property method is used to get property values the compiled model has been created with or a
compiled model level property such as ov::optimal_number_of_infer_requests:
.. tab-set::
.. tab-item:: Python :sync: py
.. doxygensnippet:: docs/articles_en/assets/snippets/ov_properties_api.py
:language: py
:fragment: [optimal_number_of_infer_requests]
.. tab-item:: C++ :sync: cpp
.. doxygensnippet:: docs/articles_en/assets/snippets/ov_properties_api.cpp
:language: cpp
:fragment: [optimal_number_of_infer_requests]
Or the number of threads that would be used for inference on CPU device:
.. tab-set::
.. tab-item:: Python :sync: py
.. doxygensnippet:: docs/articles_en/assets/snippets/ov_properties_api.py
:language: py
:fragment: [inference_num_threads]
.. tab-item:: C++ :sync: cpp
.. doxygensnippet:: docs/articles_en/assets/snippets/ov_properties_api.cpp
:language: cpp
:fragment: [inference_num_threads]