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# Add RHI Device Caching and Test Prefix Exclusion
## Summary
This PR introduces two key improvements to the Slang test
infrastructure:
1. **RHI Device Caching**: Implements device caching to significantly
speed up test execution by reusing graphics devices across tests, **RHI
Device Caching reduces slang-test execution time from ~15 minutes to ~5
minutes in Windows release builds**
2. **Test Prefix Exclusion**: Adds `-exclude-prefix` option to skip
tests matching specified path prefixes
## Changes
### RHI Device Caching
- **New `DeviceCache` class** (`slang-test-device-cache.h/cpp`):
Thread-safe device cache with LRU eviction (max 10 devices)
- **Cache control option**: `-cache-rhi-device` flag in both
`slang-test` and `render-test`
- Default: **enabled** in slang-test, **disabled** in render-test when
run standalone
- Automatically skips caching for CUDA devices (due to driver issues)
- **Performance benefit**: Eliminates expensive device
creation/destruction cycles, especially beneficial for Vulkan on Tegra
platforms
### Test Prefix Exclusion
- **New `-exclude-prefix <prefix>` option** in slang-test
- Allows excluding entire test directories or patterns from execution
- Complements existing `-category` and individual test filtering options
### Usage Examples
```bash
# Enable device caching (default)
slang-test
# Disable device caching
slang-test -cache-rhi-device false
# Exclude tests from specific directories
slang-test -exclude-prefix tests/problematic/
slang-test -exclude-prefix tests/slow/ -exclude-prefix tests/experimental/
```
This change should significantly improve test execution performance,
particularly in CI environments with frequent device operations. This is
needed for running the GPU test in aarch64, where repeated device
creation/destroy is causing driver issues.
Needed by: https://github.com/shader-slang/slang/issues/8346
---------
Co-authored-by: slangbot <ellieh+slangbot@nvidia.com>
Co-authored-by: slangbot <186143334+slangbot@users.noreply.github.com>
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