Add Presto GPU landing page README

presto/README.md

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+# Presto GPU
+
+Welcome to the Presto GPU testing and benchmarking infrastructure! This directory contains everything needed to build, deploy, and test Presto with GPU-accelerated native execution using NVIDIA cuDF and Velox.
+
+## Overview
+
+This infrastructure enables running Presto with GPU-accelerated query execution, leveraging the GPU-native Velox execution engine powered by NVIDIA cuDF. For more details about the technology behind GPU acceleration, see the [NVIDIA Developer Blog: Accelerating Large-Scale Data Analytics with GPU-Native Velox and NVIDIA cuDF](https://developer.nvidia.com/blog/accelerating-large-scale-data-analytics-with-gpu-native-velox-and-nvidia-cudf/).
+
+For general information about the velox-testing repository, please see the [main README](https://github.com/rapidsai/velox-testing/blob/main/README.md).
+
+## Current Testing Status
+
+**TPC-H** is the primary benchmark suite currently used for testing Presto GPU functionality. The infrastructure supports comprehensive testing including:
+- Functional correctness testing
+- Performance benchmarking
+- CPU vs GPU comparison
+- Integration testing with Hive metastore
+
+TPC-DS support is also available in the testing infrastructure and is under active development.
+
+## Quick Start
+
+### Prerequisites
+
+Ensure you have the following directory structure:
+
+```
+├─ base_directory/
+  ├─ velox-testing
+  ├─ presto
+  ├─ velox
+```
+
+All three repositories must be checked out as sibling directories.
+
+### Building and Starting Presto GPU
+
+1. Navigate to the scripts directory:
+   ```bash
+   cd velox-testing/presto/scripts
+   ```
+
+2. Set up your data directory (optional but recommended):
+   ```bash
+   export PRESTO_DATA_DIR=/path/to/your/benchmark/data
+   ```
+
+   > **Tip:** Add this export to your `~/.bashrc` to avoid setting it each time.
+
+3. Build dependencies (first time only):
+   ```bash
+   ./build_centos_deps_image.sh
+   # OR fetch a pre-built image (requires credentials)
+   ./fetch_centos_deps_image.sh
+   ```
+
+4. Start Presto with GPU workers:
+   ```bash
+   ./start_native_gpu_presto.sh
+   ```
+
+5. Access Presto at http://localhost:8080
+
+### Running Tests
+
+Execute integration tests using the provided script:
+
+```bash
+cd velox-testing/presto/scripts
+./run_integ_test.sh --help  # See all options
+./run_integ_test.sh --test-suite tpch
+```
+
+Or run tests directly with pytest:
+
+```bash
+cd velox-testing/presto/testing/integration_tests
+pytest tpch_test.py
+```
+
+### Running Benchmarks
+
+1. Start a Presto instance with GPU workers (see above)
+
+2. Set up benchmark tables (if needed):
+   ```bash
+   cd velox-testing/presto/scripts
+   ./setup_benchmark_data_and_tables.sh --help  # See all options
+   ```
+
+3. **Important:** Run ANALYZE TABLES on CPU Presto first:
+   ```bash
+   ./analyze_tables.sh
+   ```
+   This step is required because aggregation for statistics collection is not yet supported on GPU. The statistics benefit GPU execution by improving performance and reducing OOM failures.
+
+4. Run benchmarks:
+   ```bash
+   ./run_benchmark.sh --help  # See all options
+   ./run_benchmark.sh --benchmark tpch
+   ```
+
+## Directory Structure
+
+- **`docker/`** - Docker Compose configurations and Dockerfiles for different Presto variants
+- **`pbench/`** - Performance benchmarking utilities and TPC-H query definitions
+- **`scripts/`** - Shell scripts for building, deploying, and testing Presto
+- **`testing/`** - Python-based test framework using pytest
+  - `integration_tests/` - Functional correctness tests
+  - `performance_benchmarks/` - Performance testing infrastructure
+  - `common/` - Shared test utilities and query definitions
+
+## Available Presto Variants
+
+The infrastructure supports three deployment variants:
+
+1. **Java Presto** - Pure Java coordinator and workers
+   ```bash
+   ./start_java_presto.sh
+   ```
+
+2. **Native CPU Presto** - Java coordinator with native CPU workers
+   ```bash
+   ./start_native_cpu_presto.sh
+   ```
+
+3. **Native GPU Presto** - Java coordinator with GPU-accelerated native workers
+   ```bash
+   ./start_native_gpu_presto.sh
+   ```
+
+## Benchmark Data
+
+The infrastructure uses Hive-style directory layouts with Parquet files. For TPC-H, the expected structure is:
+
+```
+benchmark_data/
+└─ tpch/
+   ├─ customer/
+   ├─ lineitem/
+   ├─ nation/
+   ├─ orders/
+   ├─ part/
+   ├─ partsupp/
+   ├─ region/
+   └─ supplier/
+```
+
+Use the provided scripts to generate data at various scale factors or set up tables on existing data.
+
+## Testing Different Scale Factors
+
+Generate test files for different scale factors:
+
+```bash
+cd velox-testing/presto/testing/integration_tests/scripts
+./generate_test_files.sh --scale-factor 100
+```
+
+Then run tests normally using the integration test scripts.
+
+## Configuration
+
+Configuration files for Presto are managed through a template system located in:
+- `docker/config/template/` - Configuration templates
+- `docker/config/params.json` - Parameters for configuration generation
+
+To modify Presto settings, edit the templates and regenerate configurations using:
+
+```bash
+cd velox-testing/presto/scripts
+./generate_presto_config.sh
+```
+
+## Resources
+
+- [Main Repository README](https://github.com/rapidsai/velox-testing/blob/main/README.md)
+- [NVIDIA Blog: GPU-Native Velox and cuDF](https://developer.nvidia.com/blog/accelerating-large-scale-data-analytics-with-gpu-native-velox-and-nvidia-cudf/)
+- [Presto Official Documentation](https://prestodb.io/)
+- [Velox Documentation](https://facebookincubator.github.io/velox/)
+
+## Contributing
+
+Please see the [CONTRIBUTING.md](https://github.com/rapidsai/velox-testing/blob/main/CONTRIBUTING.md) guide in the main repository for information on how to contribute to this project.
+
+## License
+
+See [LICENSE](https://github.com/rapidsai/velox-testing/blob/main/LICENSE) in the main repository.
+