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Implements a new vortex-metal crate analogous to vortex-cuda that enables GPU-accelerated array execution on Apple Silicon using the Metal framework. Key components: - MetalDeviceBuffer: DeviceBuffer implementation wrapping MTLBuffer - MetalSession: Session managing Metal device, command queue, kernel registry - MetalExecutionCtx: Execution context for kernel dispatch - MetalLibraryLoader: Runtime shader compilation and caching - FoRExecutor: Frame-of-Reference decoding kernel Features: - Runtime Metal shader compilation using objc2-metal - Unified memory support for Apple Silicon (MTLStorageModeShared) - Synchronous execution model (appropriate for unified memory) - Full type support (u8-u64, i8-i64) for FoR decoding Test Results: - All 8 FoR decompression tests pass (signed and unsigned types) Signed-off-by: Claude <claude@claude.ai>
Add FoR decompression benchmarks comparing Metal vs CPU performance. Update plan.md with Phase 1 & 2 completion status and benchmark results. Benchmark results show Metal and CPU achieving equivalent throughput (~30-34 GiB/s) for FoR decoding, which is memory-bound. This validates the Metal kernel launch overhead is minimal and unified memory works well. Signed-off-by: Claude <claude@claude.ai>
Add a pure CPU benchmark for Frame-of-Reference (FoR) decompression to enable comparison with GPU-accelerated implementations (vortex-metal, vortex-cuda). Benchmark results on M3 Max show ~33-38 GB/s throughput for all integer types, which is near memory bandwidth limits - consistent with Metal benchmark results showing CPU/GPU parity for this memory-bound operation. Signed-off-by: Claude <claude@claude.ai>
Add benchmark variant that pre-loads data on GPU to isolate kernel execution time from buffer allocation overhead. Results show no difference between preloaded and with-copy variants on Apple Silicon due to unified memory - buffer creation is the only overhead, not actual data transfer. Throughput remains ~34 GiB/s (vs ~400 GB/s theoretical), indicating remaining overhead is in command buffer submission and kernel dispatch latency, not memory bandwidth. Signed-off-by: Claude <claude@claude.ai>
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just parking this here. performance is not that great, not coming anywhere close to saturating the memory bw on M4 Max