# VkPhysicalDeviceGroupProperties(3) Manual Page

## Name

VkPhysicalDeviceGroupProperties - Structure specifying physical device group properties

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## C Specification

The `VkPhysicalDeviceGroupProperties` structure is defined as:

    // Provided by VK_VERSION_1_1
    typedef struct VkPhysicalDeviceGroupProperties {
        VkStructureType     sType;
        void*               pNext;
        uint32_t            physicalDeviceCount;
        VkPhysicalDevice    physicalDevices[VK_MAX_DEVICE_GROUP_SIZE];
        VkBool32            subsetAllocation;
    } VkPhysicalDeviceGroupProperties;

or the equivalent

    // Provided by VK_KHR_device_group_creation
    typedef VkPhysicalDeviceGroupProperties VkPhysicalDeviceGroupPropertiesKHR;

## Members

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this structure.

- `physicalDeviceCount` is the number of physical devices in the group.

- `physicalDevices` is an array of `VK_MAX_DEVICE_GROUP_SIZE` VkPhysicalDevice handles representing all physical devices in the group. The first `physicalDeviceCount` elements of the array will be valid.

- `subsetAllocation` specifies whether logical devices created from the group support allocating device memory on a subset of devices, via the `deviceMask` member of the VkMemoryAllocateFlagsInfo. If this is `VK_FALSE`, then all device memory allocations are made across all physical devices in the group. If `physicalDeviceCount` is `1`, then `subsetAllocation` must be `VK_FALSE`.

## Description

Valid Usage (Implicit)

- VUID-VkPhysicalDeviceGroupProperties-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_GROUP_PROPERTIES`

- VUID-VkPhysicalDeviceGroupProperties-pNext-pNext
  `pNext` must be `NULL`

## See Also

VK_VERSION_1_1, VkBool32, VkPhysicalDevice, VkStructureType, vkEnumeratePhysicalDeviceGroups, vkEnumeratePhysicalDeviceGroupsKHR

## Document Notes

For more information, see the Vulkan Specification

This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.

## Copyright

Copyright 2014-2024 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0