# WorkgroupSize(3) Manual Page

## Name

WorkgroupSize - Size of a workgroup

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## Description

`WorkgroupSize`

Note | SPIR-V 1.6 deprecated `WorkgroupSize` in favor of using the `LocalSizeId` Execution Mode instead. Support for `LocalSizeId` was added with `VK_KHR_maintenance4` and promoted to core in Version 1.3.

Decorating an object with the `WorkgroupSize` built-in decoration will make that object contain the dimensions of a local workgroup. If an object is decorated with the `WorkgroupSize` decoration, this takes precedence over any `LocalSize` or `LocalSizeId` execution mode.

Valid Usage

- VUID-WorkgroupSize-WorkgroupSize-04425
  The `WorkgroupSize` decoration must be used only within the `GLCompute`, `MeshEXT`, `TaskEXT`, `MeshNV`, or `TaskNV` `Execution` `Model`

- VUID-WorkgroupSize-WorkgroupSize-04426
  The variable decorated with `WorkgroupSize` must be a specialization constant or a constant

- VUID-WorkgroupSize-WorkgroupSize-04427
  The variable decorated with `WorkgroupSize` must be declared as a three-component vector of 32-bit integer values

- VUID-WorkgroupSize-TileShadingRateQCOM-10635
  If the `TileShadingRateQCOM` `Execution` `Mode` is used, variables decorated with`WorkgroupSize` must be declared using the `Input` `Storage` `Class`

## See Also

No cross-references are available

## 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 2014-2025 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0