Mojo module
id
This module provides GPU thread and block indexing functionality.
It defines aliases and functions for accessing GPU grid, block, thread and cluster dimensions and indices. These are essential primitives for GPU programming that allow code to determine its position and dimensions within the GPU execution hierarchy.
Most functionality is architecture-agnostic, with some NVIDIA-specific features clearly marked. The module is designed to work seamlessly across different GPU architectures while providing optimal performance through hardware-specific optimizations where applicable.
comptime values
block_dim
comptime block_dim = _BlockDim()
Contains the dimensions of the block as x, y, and z values.
For example: block_dim.y.
block_dim_int
comptime block_dim_int = _BlockDim()
Contains the dimensions of the block as x, y, and z values.
For example: block_dim.y.
block_id_in_cluster
comptime block_id_in_cluster = _ClusterBlockIdx()
Contains the block id of the threadblock within a cluster, as x, y, and z values.
block_idx
comptime block_idx = _BlockIdx()
Contains the block index in the grid, as x, y, and z values.
block_idx_int
comptime block_idx_int = _BlockIdx()
Contains the block index in the grid, as x, y, and z values.
cluster_dim
comptime cluster_dim = _ClusterDim()
Contains the dimensions of the cluster, as x, y, and z values.
cluster_idx
comptime cluster_idx = _ClusterIdx()
Contains the cluster index in the grid, as x, y, and z values.
global_idx
comptime global_idx = _GlobalIdx()
Contains the global offset of the kernel launch, as x, y, and z values.
grid_dim
comptime grid_dim = _GridDim()
Provides accessors for getting the x, y, and z dimensions of a grid.
lane_id_int
comptime lane_id_int = lane_id[Int]
Returns the lane ID of the current thread within its warp.
See lane_id().
thread_idx
comptime thread_idx = _ThreadIdx()
Contains the thread index in the block, as x, y, and z values.
thread_idx_int
comptime thread_idx_int = _ThreadIdx()
Contains the thread index in the block, as x, y, and z values.
Functions
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lane_id: Returns the lane ID of the current thread within its warp. -
sm_id: Returns the Streaming Multiprocessor (SM) ID of the current thread. -
warp_id: Returns the warp ID of the current thread within its block. The warp ID is a unique identifier for each warp within a block, ranging from 0 to BLOCK_SIZE/WARP_SIZE-1. This ID is commonly used for warp-level programming and synchronization within a block.
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