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| layout: page |
| title: Velox GPU |
| nav_order: 9 |
| parent: Getting-Started |
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| # GPU Acceleration in Velox/Gluten |
| *Unified execution engine leveraging CUDF for hardware-accelerated Spark SQL queries* |
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| ## **1. Overview** |
| - **Purpose**: Accelerate Velox operators via CUDF APIs, replacing CPU execution when enabled. |
| - **Status**: Experimental (TPC-H SF1 validated). Integrates RAPIDS ecosystem with Apache Spark via Gluten . |
| - **Key Benefit**: Some queries achieved up to **8.1x speedup** on x86 vs. Spark Java engine . |
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| ## **2. Prerequisites** |
| - **CUDA Toolkit**: 12.8.0 ([download](https://developer.nvidia.com/cuda-downloads?target_os=Linux)). |
| - **NVIDIA Drivers**: Compatible with CUDA 12.8. |
| - **Container Toolkit**: Install `nvidia-container-toolkit` ([guide](https://docs.nvidia.com/datacenter/cloud-native/container-toolkit/latest/install-guide.html)). |
| - **System Reboot**: Required after driver installation. |
| - **Environment Setup**: Use [`start_cudf.sh`](https://github.com/apache/incubator-gluten/tree/main/dev/start_cudf.sh) for host configuration . |
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| ## **3. Implementation Mechanics** |
| - **Operator Conversion**: |
| - Velox PlanNodes → **GPU operators** when `spark.gluten.sql.columnar.cudf=true`. |
| - Falls back to CPU operators if GPU unsupported (triggers row/columnar data conversion) . |
| - **Debugging**: Enable `spark.gluten.debug.enabled.cudf=true` for operator replacement logs. |
| - **Memory**: Global [RMM](https://docs.rapids.ai/api/librmm/stable/) memory manager, cannot align with Spark memory system. |
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| ## **4. Docker Deployment** |
| ```bash |
| docker pull apache/gluten:centos-9-jdk8-cudf # Pre-built GPU image |
| docker run --name gpu_gluten_container --gpus all -it apache/gluten:centos-9-jdk8-cudf |
| ``` |
| - **Image Includes**: Native build cache, Gluten dependencies, Spark 3.4 environment. |
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| ## **5. Build & Deployment** |
| #### **Dependencies** |
| The OS, Spark version, Java version aligns with Gluten CPU. |
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| ### **Compilation Commands** |
| If building in the docker image, no need to set up script and build arrow. |
| ```bash |
| ./dev/buildbundle-veloxbe.sh --run_setup_script=OFF --build_arrow=OFF --enable_cudf=ON |
| ``` |
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| ## **6. GPU Operator Support Status** |
| | **Operator** | **Status** | **Notes** | |
| |-----------------|-----------------|--------------------------| |
| | **Scan** | ❌ Not supported| In Development | |
| | **Project** | ⚠️ Partial | Function TPCH-compatible | |
| | **Filter** | ✅ Implemented | Core operator | |
| | **OrderBy** | ✅ Implemented | Merged in Velox #12735 | |
| | **Aggregation** | ⚠️ Partial | TPCH-compatible | |
| | **Join** | ⚠️ Partial | TPCH-compatible | |
| | **Spill** | ❌ Not supported | In Planning | |
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| --- |
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| ## **7. Performance Validation** |
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| GPU performs better on operator HashJoin and HashAggregation. |
| Single Operator like Hash Agg shows 5x speedup. |
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| ## **8. Relevant Resources** |
| 1. [CUDF Docs](https://docs.rapids.ai/api/cudf/stable/libcudf_docs/) - GPU operator APIs. |
| 2. [Gluten GPU Issue #9098](https://github.com/apache/incubator-gluten/issues/8851) - Development tracker. |
