Making it easier to work with shaders https://git.yummers.dev/slang.git/atom?h=master 2025-09-22T22:46:42+00:00 2025-09-22T22:46:42+00:00 Gangzheng Tong tonggangzheng@gmail.com 2025-09-22T22:46:42+00:00 urn:sha1:ba8132345cbae5b749b4a01deda732ad6f8251a0 # 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>