feat: add Gen3 SDK vs CDIS download performance testing suite

gen3-load-tests/README.md

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+# Download Performance Testing Script
+
+A comprehensive Python script that compares CDIS Data Client and Gen3 SDK download-multiple-async functionality with profiling and monitoring capabilities.
+
+## Features
+
+- **Performance Testing**: Comprehensive async and CDIS performance comparison
+- **Profiling**: Built-in cProfile integration with detailed bottleneck analysis
+- **Real-time Monitoring**: CPU, memory, and resource usage tracking during downloads
+- **HTML Reports**: Interactive HTML reports with charts and detailed metrics
+- **Multiple Test Runs**: Configurable number of runs per method for statistical analysis
+- **Detailed Timing**: Breakdown of setup, download, and verification phases
+- **File Matching**: Intelligent file matching with GUID verification
+
+## Requirements
+
+- Python 3.9+
+- Poetry for dependency management
+- Local `gen3sdk-python` directory for Gen3 SDK testing
+- `gen3-client` executable for CDIS testing
+
+## Installation
+
+1. Install Poetry (if not already installed):
+
+```bash
+curl -sSL https://install.python-poetry.org | python3 -
+```
+
+2. Install dependencies using Poetry:
+
+```bash
+poetry install
+```
+
+3. Activate the virtual environment:
+
+```bash
+poetry shell
+```
+
+## Configuration
+
+Before running the tests, update the following paths in the script or use command line arguments:
+
+1. **Gen3 SDK Path**: Update `gen3sdk_path` in the script or use `--gen3sdk-path ~/path/to/gen3sdk-python`
+2. **Credentials**: Update `credentials_path` or use `--credentials ~/path/to/credentials.json`
+3. **Gen3 Client**: Ensure `gen3-client` is in your PATH or specify with `--gen3-client-path`
+
+## Usage
+
+### Basic Usage
+
+```bash
+python download_performance_test.py --manifest test_data/sample_manifest.json
+```
+
+### Command Line Options
+
+```bash
+python download_performance_test.py \
+  --manifest manifest.json \
+  --num-runs 2 \
+  --max-concurrent-async 100 \
+  --num-workers-cdis 4 \
+  --test-methods "async,cdis" \
+  --endpoint "https://data.midrc.org" \
+  --credentials "~/path/to/credentials.json" \
+  --gen3-client-path "gen3-client" \
+  --gen3sdk-path "~/path/to/gen3sdk-python" \
+  --download-dir "downloads" \
+  --results-dir "download_performance_results" \
+  --disable-profiling \
+  --disable-monitoring \
+  --disable-detailed-timing
+```
+
+### Available Arguments
+
+| Argument                    | Default                          | Description                         |
+| --------------------------- | -------------------------------- | ----------------------------------- |
+| `--manifest`                | `test_data/sample_manifest.json` | Path to manifest JSON file          |
+| `--num-runs`                | `2`                              | Number of test runs per method      |
+| `--max-concurrent-async`    | `100` (configurable)             | Max concurrent requests for async   |
+| `--num-workers-cdis`        | `4` (configurable)               | Number of CDIS workers              |
+| `--test-methods`            | `"async,cdis"`                   | Comma-separated test methods        |
+| `--endpoint`                | `https://data.midrc.org`         | Gen3 endpoint URL                   |
+| `--credentials`             | `~/path/to/credentials.json`     | Path to credentials file            |
+| `--gen3-client-path`        | `gen3-client`                    | Path to gen3-client executable      |
+| `--gen3sdk-path`            | `~/path/to/gen3sdk-python`       | Path to local gen3sdk-python        |
+| `--download-dir`            | `downloads`                      | Directory to store downloaded files |
+| `--results-dir`             | `download_performance_results`   | Directory to store results          |
+| `--disable-profiling`       | `False`                          | Disable performance profiling       |
+| `--disable-monitoring`      | `False`                          | Disable real-time monitoring        |
+| `--disable-detailed-timing` | `False`                          | Disable detailed timing breakdown   |
+
+### Test Methods
+
+- **`cdis`**: Tests CDIS Data Client with worker-based concurrency
+- **`async`**: Tests Gen3 SDK with async/await and semaphore control
+
+## Output
+
+Results are saved to `download_performance_results/`:
+
+- **HTML Report**: Interactive report with charts (`download_performance_report_YYYYMMDD_HHMMSS.html`)
+- **JSON Results**: Detailed metrics (`enhanced_results_YYYYMMDD_HHMMSS.json`)
+- **Log Files**: Comprehensive test logs (`test_run.log`)
+- **Downloaded Files**: Test files in method-specific directories
+
+## Example Usage
+
+```bash
+# Test both methods with 2 runs each (default)
+python download_performance_test.py \
+  --manifest test_data/sample_manifest.json
+
+# Test only async method with high concurrency
+python download_performance_test.py \
+  --manifest manifest.json \
+  --test-methods "async" \
+  --max-concurrent-async 500
+
+# Quick test with profiling disabled
+python download_performance_test.py \
+  --manifest manifest.json \
+  --num-runs 1 \
+  --disable-profiling \
+  --disable-monitoring
+```
+
+## What Gets Tested
+
+- **Download Success Rates**: File-by-file success tracking with GUID verification
+- **Performance Metrics**: Throughput (MB/s), timing breakdown, concurrency efficiency
+- **Resource Usage**: Real-time memory, CPU, and I/O monitoring
+- **Profiling Analysis**: Function-level performance bottlenecks and optimization insights
+- **Scalability**: Performance under different concurrency levels
+- **Error Handling**: Comprehensive error tracking and failure analysis
+
+## Performance Insights
+
+The script provides detailed performance analysis including:
+
+- Top performance bottlenecks by cumulative time
+- Function call efficiency metrics
+- I/O and network operation analysis
+- Memory and CPU usage patterns
+- Optimization recommendations