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* Epilogue chainer * epilogue chainer with context to share state in between epilogues * chain-able epilogues for cshuffle * clang-format * rebase related changes - Added separate chainer test - clang format * comment resolutions * clang-format * Policy based chaining - basic Policy structure to control blanket looping and barrier placement. - to be extended for fine grianed control - to be modified to move possible auto-compute values and SFC access count to policy * Refactoring as per spec - Introduced epilogue schedule, graph - modified chainer to function with graph and schedule * minor_changes - made functions to overload in the epilogue_graph file * clang-format * Documentation and Comments - Added comments to files - Noted changes in changelog - Added README to explain the chainer and current status, exact use steps to be added * Comment resolutions - README modified with the suggested changes - Comment fixed accordingly * major refactoring - modified the chainer files to match the new design - updated comments - updated readme - multi-d example shocases use of the chainer * minor cleanup * tensor and rowcol quant chainer epilogue - added scalarepilogue for tensor quant - added schedule for tensorquant - modified quant example to use chainer and appropriate schedules * Refactor epilogue chainer: generalize ops and standardize context interface Address review comments. Changes: - Rename CastToLdsOp to CastAndStoreToLdsOp for clarity - Standardize context member names (working_tile, out_tile, aux_windows) - Update README documentation with correct operation names - Clean up parameter naming in epilogue_chainer.hpp (OutWindow, AccTile, AuxWindows) - common_epilogue_ops.hpp: General-purpose ops (ScaleScalarOp, CastAndStoreToLdsOp, LoadFromLdsOp, ElementwiseOp, StoreOp, MoveWindowsOp) - cshuffle_epilogue_chainer_ops.hpp: CShuffle-specific context and slice operations - epilogue_chainer.hpp: Cleaned up parameter naming for generality - Removed test files that are no longer needed. These were added for intermediate use * update cshuffle chainer ops file w.r.t cshuffle_epilogue.hpp updates & add chainer to quant gemm example * fix compile errors - CI uses c++17 while the code had c++20 features --------- Co-authored-by: Illia Silin <98187287+illsilin@users.noreply.github.com> Co-authored-by: Adam Osewski <19374865+aosewski@users.noreply.github.com>
CK Tile Example Suite
This directory contains a comprehensive suite of examples demonstrating the CK Tile programming model for high-performance GPU kernels. Each example illustrates a key deep learning or HPC operation, implemented using tile-based parallelism, modular pipelines, and data movement policy.
What is CK Tile?
CK Tile is a composable GPU programming API that expresses kernels as a composition of "tiles"—rectangular blocks of computation and data movement. The pipeline & policy orchestrates data movement (global <-> LDS <-> registers), computation, and synchronization, enabling high efficiency and flexibility.
Example Index
| Example | Operation | Description |
|---|---|---|
| 01_fmha | Fused Multi-Head Attention | Tile-based FMHA with masking, quantization, and epilogue fusion |
| 02_layernorm2d | LayerNorm2D | Blockwise layer normalization with fusion and quantization |
| 03_gemm | GEMM | Matrix multiplication with tilewise parallelism |
| 04_img2col | im2col | Image-to-column transformation for GEMM-based convolution |
| 05_reduce | Reduction | Tilewise sum, max, mean reductions |
| 06_permute | Permute | Generic tensor permutation (up to rank-8) |
| 09_topk_softmax | TopK-Softmax | Rowwise softmax and top-k selection for MoE gating |
| 10_rmsnorm2d | RMSNorm2D | Root mean square normalization for LLMs |
| 11_add_rmsnorm2d_rdquant | Add + RMSNorm2D + RDQuant | Fused add, RMSNorm, and rowwise dynamic quantization |
| 12_smoothquant | SmoothQuant | Per-channel scaling and quantization for int8 inference |
| 13_moe_sorting | MoE Sorting | Token-to-expert rearrangement for MoE dispatch |
| 14_moe_smoothquant | MoE-SmoothQuant | Expert-dependent quantization fused with top-k selection |
| 15_fused_moe | Fused MoE | End-to-end fused MoE block: sorting, group-GEMM, activation, weighting |
| 16_batched_gemm | Batched GEMM | Parallel computation of multiple GEMMs |
| 17_grouped_gemm | Grouped GEMM | Multiple independent GEMMs with different shapes |
| 18_flatmm | FLATMM | Flattened matrix multiplication for packed layouts |
| 19_gemm_multi_d | Multi-D GEMM | GEMM with multiple side inputs (bias, residual, etc.) |
| 35_batched_transpose | Batched Transpose | NCHW <-> NHWC and other layout conversions |
| 36_copy | Copy | Minimal example for tile-based memory movement |
| 37_transpose | Block Transpose | High-performance tiled transpose for large tensors |
Technical Highlights
- Tile Distribution: See
include/ck_tile/tile_program/tile_distribution/for mapping tiles to thread blocks. - Block Tile Pipelines: See
include/ck_tile/tile_program/block_tile_pipeline/for memory/computation pipelines. - Policies and Utilities: Many examples use custom policies for tile/block size and memory access.
How to Build & Run
mkdir build && cd build
sh ../script/cmake-ck-dev.sh ../ <arch>
make -j
Each example produces its own executable in build/bin/.
Learning and Extending
- Start Simple: Try 03_gemm or 36_copy to learn tile basics.
- Explore Fusion: See 11_add_rmsnorm2d_rdquant, 15_fused_moe, or 14_moe_smoothquant for advanced fusion.
- Experiment: Modify tile sizes, layouts, or pipelines to explore performance and flexibility.